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13th International Conference on Aluminum Alloys

Carnegie Mellon University Pittsburgh, Pennsylvania, USA June 3-7, 2012

Program and Abstracts Organized by: Hasso Weiland Anthony D. Rollett William A. Cassada

Table of Contents

Table of Contents Welcome

1

Organizing Committee

2

General Conference Information

3

Calendar of Events

5

Conference Maps

7

Local Area Information

9

Transportation

10

Program At-A-Glance

11

Technical Session Listing

14

Technical Program with Abstracts

38

Index

105

Notes

112

WELCOME TO

The 13th International Conference on Aluminum Alloys (ICAA-13) is convening at an exciting time! The use of aluminum in creating sustainable products is growing in response to global trends. Employing aluminum to enhance efficiency and material conservation is apparent in applications as diverse as transportation, electrical power transmission, packaging, and building and construction, just to name a few. The 10 symposia that comprise the ICAA-13 technical program cover a wide range of aluminum topics and include: Forming and Joining, Phase Transformations, Fatigue and Fracture Toughness, Advanced Analysis, Thermo-Mechanical Treatment, Casting and Solidification, Novel Materials, Corrosion and Coatings, Integrated Computational Materials Engineering, and Recycling. ICAA-13 unites researchers from the industrial, national laboratory, and university communities to discuss the latest scientific breakthroughs and technological developments, as well as the bright future of aluminum. We have chosen to hold the meeting on the Carnegie Mellon University (CMU) campus because of its strong connection to the world of aluminum and its excellent facilities. We trust that you will find the meeting to be highly productive. If there is anything we can do to help you get the most out of your conference experience, please do not hesitate to contact us. With Best Wishes for Your Enjoyment of the Conference! William Cassada, Anthony Rollett, and Hasso Weiland

Welcome to ICAA13

13th International Conference on Aluminum Alloys

1

COMMITTEE CHAIRS William Cassada Alcoa Inc.

Anthony Rollett Carnegie Mellon University

INTERNATIONAL COMMITTEE

Hasso Weiland Alcoa Inc.

TECHNICAL PROGRAM CHAIRS Symposium Chair & Co-Chair

William Cassada Director Research Alcoa Inc., Pittsburgh, PA, USA

Casting and Solidification Ralf Napolitano, Iowa State University MG Chu, Alcoa Inc.

Joseph Robson Lecturer School of Materials, Manchester University, UK

Phase Transformations Gary Shiflet, University of Virginia Dave Laughlin, Carnegie Mellon University

Juergen Hirsch Senior Scientist Hydro Aluminium R&D, Bon, Germany

Thermo-mechanical Treatment Wojciech Misiolek, Lehigh University Vivek Sample, Alcoa Inc.

Knut Marthinsen Professor Norwegian University of Science & Technology, Trondheim, Norway

Corrosion, Coating and Surfaces Rudi Buchheit, Ohio State University Jim Moran, Alcoa Inc.

Organizing Committee

Barry Muddle Professor Monash University, Clayton, Australia

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Fatigue and Fracture Toughness Krishnan Sankaran, Boeing HJ Schmidt, AeroStruc

Ashim Kumar Mukhopadhyay Defence Metallurgical Research Laboratory, Hyderabad, India

Forming and Joining Kaan Inal, University of Waterloo Raj Mishra, General Motors Inc.

Warren Poole Professor University of British Columbia, Vancouver, Canada

Recycling Diran Apelian, Worcester Polytechnic Institute Dan Bryant, Alcoa Inc.

Tatsuo Sato Professor Tokyo Institute of Technology, Tokyo, Japan

Advanced Analysis David Seidman, Northwestern University Hasso Weiland, Alcoa Inc.

Christophe Sigli Senior Scientist CONSTELLIUM, Centre de Recherches de Voreppe, France

Integrated Computational Metallurgical Engineering John Allison, University of Michigan George Spanos, The Minerals, Metals & Materials Society

Birgit Skrotzki Division Head Federal Institute for Materials Research & Testing, Berlin, Germany

Novel Materials Ernest Chin, Army Research Laboratory Warren Hunt, The Minerals, Metals & Materials Society

Hideo Yoshida Senior Research Fellow Sumitomo Light Metal Industries, Ltd., Nagoya, Japan Mark Gallerneault Technical Director Novelis, Kingston, Canada Qing Liu Vice President Chongqing University, China Alexis Deschamps Professor SIMAP/Phelma – Domaine Universitaire (Grenoble), Saint Martin d’Hères Cedex, France

CONFERENCE INFORMATION

POLICIES

About the Venue Carnegie Mellon University is a global research university with more than 11,000 students, 86,500 alumni, and 4,000 faculty and staff. Recognized for its world-class arts and technology programs, collaboration across disciplines, and innovative leadership in education, CMU is consistently a topranked university.

Badges All attendees must wear registration badges at all times during the conference to ensure admission to events included in the paid fee such as technical sessions, exhibition and receptions.

Full Conference Registration Your full-conference registration includes one copy of the proceedings disk, and your badge ensures admission to each of these events: • Technical and Poster Sessions • Opening Reception on Sunday evening • Two-day pass to the Exhibition (located in the Wiegand Gymnasium) • Reception/Conference Dinner on Wednesday evening Registration Hours On Sunday, June 3, the registration desk will be located in the College of Fine Arts Great Hall. The registration desk will be located outside of the Connan Room (in the University Center) throughout the remainder of the week. Sunday, June 3 Monday, June 4 Tuesday, June 5 Wednesday, June 6 Thursday, June 7

4:30 – 7 p.m. 8 a.m. – 5 p.m. 8 a.m. – 5 p.m. 8 a.m. – 5 p.m. 8 a.m. – Noon

Wiley Online Library: http://onlinelibrary.wiley.com.

Photography Notice By registering for this conference, all attendees acknowledge that they may be photographed by conference personnel while at events. Further, those photos may be used for promotional purposes. Audio/Video Recording Policy Recording of sessions (audio, video, still photography, etc.) intended for personal use, distribution, publication, or copyright without the express written consent of the individual authors is strictly prohibited. Americans With Disabilities Act The federal Americans with Disabilities Act (ADA) prohibits discrimination against, and promotes public accessibility for, those with disabilities. In support of, and in compliance with ADA, we ask those requiring specific equipment or services to contact CMU Conference and Event Services at 412-268-1125 or confserv@andrew.cmu.edu in advance. Cell Phone Use In consideration of attendees and presenters, we kindly request that you minimize disturbances by setting all cell phones or PDAs on “silent” while in meeting rooms. Recycling Discard badges and programs in the bins located in the registration area. Aluminum recycling bins are located throughout the conference site. Please be sure to recycle your beverage containers.

13th International Conference on Aluminum Alloys

General Conference Information

Proceedings Full-conference registrants receive one copy of the proceedings. Additional copies may be purchased for $125 at www.wiley.com (TMS members receive a 25% discount). Approximately six weeks after the meeting, individual papers will be available through the

Refunds The deadline for all refunds was May 4, 2012. No refunds will be issued at the conference. Fees and tickets are nonrefundable.

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SPEAKER INFORMATION Author Preview Room The Author Preview Room will be located in the Pake Room (in the University Center). Monday, June 4 Tuesday, June 5 Wednesday, June 6 Thursday, June 7

8 a.m. – 5 p.m. 8 a.m. – 5 p.m. 8 a.m. – 5 p.m. 8 a.m. – 3:35 p.m.

Social Program Guests of conference attendees are invited to partake in several special activities planned for each day. Visit the registration desk for more information. CAMPUS INFORMATION A map of the CMU campus is available at: www.psy.cmu.edu/map/index.html.

Exhibition The exhibition will be located in the Wiegand Gymnasium (in the University Center).

The University Center is building no. 28, and the College of Fine Arts (for the Opening Reception) is no. 5 on the maps.

Monday, June 4 10 a.m. – 7 p.m. Tuesday, June 5 10 a.m. – 7 p.m. ATTENDEE ACTIVITIES AND AMENITIES

There is also an “app” for navigating on campus. On your AndroidTM device, navigate to the Google Play StoreTM and seach for “Mapyst CMU”.

Internet Access Complimentary internet access is available for ICAA-13 attendees. Visit the registration desk to receive your access code.

General Conference Information

Welcome Reception The Welcome Reception will be held on Sunday, June 3 from 5-7 p.m. in the College of Fine Arts Great Hall.

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Reception and Conference Dinner The reception will be held on Wednesday, June 6, from 5-7 p.m. at Phipps Conservatory. Phipps Conservatory and Botanical Gardens is a great steel and glass Victorian greenhouse that has been inviting visitors to explore the beauty and mysteries of plants since 1893. Located in Schenley Park – one of Pittsburgh’s largest green spaces – Phipps Conservatory is a cultural and architectural centerpiece of Oakland’s neighborhood. The Conference dinner will be held on Wednesday, June 6 from 7-10 p.m. in the Rangos Ballroom.

Mobile app Screenshot

Calendar of Events FUNCTION

TIME

LOCATION

Sunday, June 3 Registration

4:30 - 7 p.m.

College of Fine Arts Great Hall

Welcome Reception

5 - 7 p.m.

College of Fine Arts Great Hall

Monday, June 4 Registration

8 a.m. - 5 p.m.

Outside Connan Room

Author Preview Room

8 a.m. - 5 p.m.

Pake Room

Poster Set-up

8 a.m. - Noon

Wiegand Gymnasium

Plenary Session

8:30 a.m. - Noon

McConomy

Exhibition

10 a.m. - 7 p.m.

Wiegand Gymnasium

Lunch Break

12 - 1:20 p.m.

On Your Own

Technical Sessions

1:20 - 5 p.m.

See Technical Program

Poster Session/Exhibition

5 - 7 p.m.

Wiegand Gymnasium

Tuesday, June 5 8 a.m. - 5 p.m.

Outside Connan Room

Author Preview Room

8 a.m. - 5 p.m.

Pake Room

Morning Keynotes

8:15 - 9 a.m.

McConomy/Rangos I

Technical Sessions

9:15 - 11:45 a.m.

See Technical Program

Exhibition

10 a.m. - 7 p.m.

Wiegand Gymnasium

Lunch Break

11:45 a.m. - 1:15 p.m.

On Your Own

Afternoon Keynotes

1:15 - 2 p.m.

McConomy/Rangos I

Technical Sessions

2 - 5:10 p.m.

See Technical Program

Poster Session/Exhibition

5 - 7 p.m.

Wiegand Gymnasium

13th International Conference on Aluminum Alloys

Calendar of Events

Registration

5

Calendar of Events FUNCTION

TIME

LOCATION

Registration

8 a.m. - 5 p.m.

Outside Connan Room

Author Preview Room

8 a.m. - 5 p.m.

Pake Room

Morning Keynotes

8:15 - 9 a.m.

McConomy/Rangos I

Technical Sessions

9:15 - 11:45 a.m.

See Technical Program

Lunch Break

11:45 a.m. - 1:15 p.m.

On Your Own

Afternoon Keynotes

1:15 - 2 p.m.

McConomy/Rangos I

Technical Sessions

2 - 4:50 p.m.

See Technical Program

Reception

5 - 7 p.m.

Phipps Conservatory

Conference Dinner

7 - 10 p.m.

Rangos Ballroom

Registration

8 a.m. - Noon

Outside Connan Room

Author Preview Room

8 a.m. - 3:35 p.m.

Pake Room

Morning Keynotes

8:15 - 9 a.m.

McConomy/Rangos I

Technical Sessions

9:15 - 11:45 a.m.

See Technical Program

Lunch Break

11:45 a.m. - 1:15 p.m.

On Your Own

Technical Sessions

1:15 - 3:35 p.m.

See Technical Program

Closing Remarks

3:35 - 3:50 p.m.

McConomy

Wednesday, June 6

Calendar of Events

Thursday, June 7

6

Poster Session/Exhibition Wiegand Gymnasium

CMU:University Center

13th International Conference on Aluminum Alloys

Conference Maps

Registration

First Floor

7

CMU: University Center Second Floor

Conference Maps

Oakland/ Carnegie Mellon University

8

1. Holiday Inn Pittsburgh, University Center 2. Courtyard By Marriott Pittsburgh, Shadyside 3. Hilton Garden Inn Pittsburgh, University Center 4. Residence Inn By Marriott Pittsburgh University/Medical Center

ABOUT THE AREA

LOCAL EVENTS AND ATTRACTIONS

Pittsburgh, known as America’s Steel City, has redefined itself as a major academic and medical center. Once cloaked in the soot of heavy industry, the city boasts a beautiful location nestled in the western foothills of the Appalachian Mountains. Its river valleys provide dramatic views in all directions.

Driving in Pittsburgh can be a trying experience. There are few roads that run directly from point A to point B. However, Pittsburgh is fortunate to have a comprehensive mass transit network. Most city destinations are easily accessible by bus or the T, Pittsburgh’s light-rail system. Many destinations are less than a 15-minute ride from Oakland.

June 1-10, 2012

This annual festival in downtown Pittsburgh combines visual arts exhibitions, public installations, musical and dance performances, a fine arts and crafts market and lots of family fun during this 10-day festival. The Dollar Bank Three Rivers Arts Festival is one of the largest, green events of its kind that remains free to the public. For more information visit www.3riversartsfest.org. Summer Flower Show ●

June 3-September 30, 2012 ● Phipps Conservatory and Botanical Gardens

Unearth the powers of healing plants from around the world as the soothing sights and sounds of fountains provide a release from the summer heat. Bring the family and let Phipps welcome you to a world where nature’s best-kept secrets are revealed and the spirit of youth reigns supreme. For more information visit www.phipps.conservatory.org. For a full list of upcoming events, visit www.visitpittsburgh.com.

13th International Conference on Aluminum Alloys

Local Area Information

Many visitors limit themselves to the downtown area, known as the Golden Triangle, or the Oakland area, the center of academia. However, Pittsburgh offers much more. As with most older cities, Pittsburgh still retains many pedestrianoriented neighborhoods and bustling business districts featuring classic 19th century buildings. Each of these areas offers a unique experience that is exclusively Pittsburgh.

Dollar Bank Three Rivers Arts Festival ●

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ATTRACTIONS (CONT.) Pittsburgh possesses an excellent system of museums. Visit www.carnegiemuseums.org for more information. There are also notable attractions outside of Pittsburgh at Niagara Falls (about 3.5 hours), Falling Water (1.5 hours), Kentuck Knob (1.5 hours), Old Economy village (0.5 hours) and Presque Isle State Park (2.5 hours). TRANSPORTATION Public Transportation The Port Authority of Allegheny County has more than 875 buses, 83 light-rail vehicles and the Monongahela and Duquesne Inclines to help you get around Pittsburgh.

Transportation

• Subway - The ‘T’ Pittsburgh’s small but clean and safe 25.2-mile subway and light-rail system, the ‘T’ serves downtown Pittsburgh with a loop including stops at Steel Plaza at Grant Street, Gateway Center Plaza (under construction), Wood Street, and the First Avenue Parking Garage. Travel within downtown Pittsburgh is free. The subway will also deliver you across the river to Station Square on the South Side for a minimal fare. After traveling under the Monongahela River, the ‘T’ runs above ground along three different light rail lines into Pittsburgh’s south suburbs, as well as to the North Shore development area, which includes PNC Park, Heinz Field, and the Carnegie Science Center.

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• Public Bus Multiple bus routes connect downtown Pittsburgh to cultural and other attractions on the North Side and Oakland as well as to the majority of the neighborhoods surrounding Pittsburgh. • Duquesne & Monongahela Inclines Thousands of visitors each year marvel at the breathtaking view of the city of Pittsburgh while riding two of only a few remaining inclines in the country, the Monongahela (‘Mon’) &

Duquesne Inclines -- which run up and down Mt. Washington just across the Monongahela River from downtown Pittsburgh. Many residents also use the inclines on a daily basis to get down to the base of Mt. Washington where they can hop a bus or the ‘T’ over to downtown Pittsburgh. The Port Authority of Allegheny County operates its buses, light rail cars, and inclines under a zone fare structure where the amount of fare is based on trip length from Pittsburgh’s Golden Triangle or Central Business District. Higher fares are paid for trips crossing more than one zone. Fares are collected as the rider boards on an inbound, or downtown-bound trip and as the rider exits the outbound or suburban-bound trip, with some exceptions. Since Port Authority operators neither carry change nor make change, riders must be prepared to pay exact fare or pay an amount in excess of the prevailing fare. Check out the Port Authority of Allegheny County Web site at www.portauthority.org for zone maps, an interactive bus schedule locater, fare information, bus routes, and disability access, or to purchase bus tickets and passes. You can also use Google Transit to search for Pittsburgh public transportation routes using interactive Google Maps technology. Taxi Service Taxi service is available in the Greater Pittsburgh area. The area’s two largest cab companies are Yellow Cab (412-665-8100) and People’s Cab (412-681-3131). As a warning for visitors from other cities, don’t expect to be able to hail a cab anytime you want. Cabs in Pittsburgh generally require a phone call to arrange for a pickup, or a walk to the nearest hotel cab stand. Cabs are also available at the Pittsburgh International Airport.

Sunday, June 3 PM

Welcome Reception (5 - 7 p.m.) [College of Fine Arts Great Hall]

Monday, June 4 Welcome/Conference Overview [Room: McConomy]

AM

Plenary (R. Kilmer, CTO Alcoa Inc. and R. Doherty, Drexel) [Room: McConomy] Refreshment Break (10:10 - 10:25 a.m.) [Room: Connan] Plenary (S. Erdmann, Novelis; A. Hong, Chalco; and G. Shiflet, University of Virginia) [Room: McConomy] Lunch Break (12 - 1:20 p.m.)

PM

Room: McConomy

Room: Rangos I

Room: Rangos II

Room: Rangos III

Room: Connan

Room: Dowd

Room: McKenna & Peter

TMP 1

Casting & Solidification 1

Forming and Joining 1

Forming and Joining 2

Phase Transformations 1

Novel Materials 1

Coatings

Refreshment Break (3 - 3:20 p.m.) [Room: Wiegand Gymnasium]

Poster Session (5 - 7 p.m.) [Room: Wiegand Gymnasium]

Tuesday, June 5 Casting & Solidification Keynote - R. Wagstaff, Novelis [Room: McConomy] Advanced Analysis Keynote - D. Seidman, Northwestern University [Room: Rangos I]

AM

Room: McConomy

Room: Rangos I

Room: Rangos II

Room: McKenna & Peter

Room: Connan

Room: Dowd

Room: Rangos III

Room: Wright

TMP 2

Casting & Solidification 2

Forming and Joining 3

Forming and Joining 5

Phase Transformations 2

Novel Materials 2

Fatigue and Fracture Toughness 1

Advanced Analysis 1

Refreshment Break (9:55 - 10:25 a.m.) [Room: Wiegand Gymnasium]

Lunch Break (11:45 a.m. - 1:15 p.m.) Phase Transformations Keynote - T. Sato, Tokyo Institute of Technology [Room: McConomy] Fatigue and Fracture Toughness Keynote - J. Ehrstrom, Constellium CRV [Room: Rangos I] Room: Rangos I

Room: Rangos II

Room: McKenna & Peter

Room: Connan

Room: Dowd

Room: Rangos III

Room: Wright

TMP 3

Casting & Solidification 3

Forming and Joining 4

Forming and Joining 6

Phase Transformations 3

Novel Materials 3

Fatigue and Fracture Toughness 2

Advanced Analysis 2

Refreshment Break (3 - 3:30 p.m.) [Room: Wiegand Gymnasium]

Poster Session (5:10 - 7 p.m.) [Room: Wiegand Gymnasium]

13th International Conference on Aluminum Alloys

Program At-A-Glance

PM

Room: McConomy

11

Wednesday, June 6 Forming and Joining Keynote - A. Sachdev, General Motors [Room: McConomy] ICME Keynote - M. Li, Ford Motor Company [Room: Rangos I]

AM

Room: McConomy

Room: Wright

Room: Rangos I

Room: Rangos II

Room: Connan

Room: Rangos III

Room: Dowd

Room: McKenna & Peter

TMP 4

TMP 6

Casting & Solidification 4

Forming and Joining 7

Phase Transformations 4

Fatigue and Fracture Toughness 3

ICME 1

Corrosion 1

Refreshment Break (9:55 - 10:25 a.m.) [Room: Danforth Lounge]

Lunch Break (11:45 a.m. - 1:15 p.m.) TMP Keynote - H. Valberg, The Norwegian University of Science and Technology (NTNU) [Room: McConomy] Designing Against Fatigue Keynote - H. Schmidt, AeroStruc – Aeronautical Engineering [Room: Rangos I]

PM

Room: McConomy

Room: Wright

Room: Rangos I

Room: Rangos II

Room: Connan

Room: Rangos III

Room: Dowd

Room: McKenna & Peter

TMP 5

TMP 7

Casting & Solidification 5

Forming and Joining 8

Phase Transformations 5

Fatigue and Fracture Toughness 4

ICME 2

Corrosion 2

Refreshment Break (3 - 3:30 p.m.) [Room: Danforth Lounge]

Reception at Phipps Conservatory (5 - 7 p.m.) Conference Dinner (7 - 10 p.m.) [Room: Rangos Ballroom]

Thursday, June 7 Recycling Keynote - D. Apelian, Worcester Polytechnic Institute [Room: McConomy] Corrosion Keynote - R. Buchheit, Ohio State University [Room: Rangos I]

Program At-A-Glance

AM

12

Room: McConomy

Room: Connan

Room: Rangos I

Room: Rangos II

Room: Rangos III

Room: Wright

Room: Dowd

Room: McKenna & Peter

TMP 8

TMP 10

Casting & Solidification 6

Forming and Joining 9

Casting & Solidification 8

Recycling 1

ICME 3

Corrosion 3

Refreshment Break (9:55 - 10:25 a.m.) [Room: Danforth Lounge]

Lunch Break (11:45 a.m. - 1:15 p.m.)

PM

Room: McConomy

Room: Connan

Room: Rangos I

Room: Wright

Room: Dowd

Room: McKenna & Peter

TMP 9

TMP 11

Casting & Solidification 7

Recycling 2

ICME 4

Corrosion 4

Closing Remarks [Room: McConomy]

TECHNICAL SESSION LISTING

MONDAY AM Plenary Session

Room: McConomy Auditorium • University Student Center 8:30 AM

Official Welcome Addresses

8:45 AM

Conference Overview: William Cassada, Director Research, Alcoa Technical Center

9:00 AM

Advancing Innovation in Each Generation: Ray Kilmer, CTO, Alcoa

9:35 AM

The Role of Science in Aluminum Technology: Roger Doherty, Emeritus Professor, Drexel University

10:05 AM

Break

10:25 AM

Novelis – Success Factors for Research and Development: Stefan Erdmann, Vice President, Global R&D, Novelis

10:55 AM

Status and Development Trend in China Aluminum Industry: Ao Hong, Vice President, Chalco

11:25 AM

Phase Transformations in Aluminum Alloys Having No Long-Range Order – Thermodynamics, Kinetics and Atomic Mechanisms: Gary Shiflet, William G. Reynolds Professor, University of Virginia

MONDAY PM Casting & Solidification 1

Room: Rangos I • University Student Center 1:20 PM

Study on DC Casting Process of Three-Layer Composite Ingots of 4045/3004/4045 Aluminum Alloys: Jianzhong Cui1; Haitao Zhang1; Huixue Jiang1; 1Northeastern University

1:40 PM

Study on Electromagnet-Air Knife DC Casting Process of Large-Size AA 7055 Aluminum Alloys: Haitao Zhang1; Hiromi Nagaumi1; Jianzhong Cui1; 1Northeastern University

2:00 PM

Aluminum Monolithic Alloy and Multi-Alloy Cast Using Planar Solidification Approach: Men Chu1; Alvaro Giron1; William Cassada1; 1Alcoa Technical Center

2:20 PM

The Effect of Planar Solidification on Mechanical Properties of Al-Zn-Mg-Cu-Zr Alloy Plate: Tim Hosch1; M. G. Chu1; G. Feyen1; R. Rioja1; W. Cassada1; 1Alcoa

2:40 PM

Functional Gradient Products Enabled by Planar Solidification Technologies: Roberto Rioja1; Ralph Sawtell1; Men-Glenn Chu1; Mike Karabin1; William Cassada1; 1Alcoa Inc

3:00 PM

Break

3:20 PM

Development of Large-size Ultrasonic Sonotrodes for Cavitation Treatment of Molten Metals: Sergey Komarov1; Yasuo Ishiwata1; 1Nippon Light Metal Co.,Ltd.

Technical Session Listing

3:40 PM

14

Microstructural Evolution in Intensive Melt Sheared Direct-Chill Cast Aluminium Alloys: Simon Jones1; A. Prasada Rao1; BCAST

1

4:00 PM

Role of Solute and Transition Metals in Grain Refinement of Aluminum Alloys under Ultrasonic Melt Treatment: Liang Zhang1; Dmitry Eskin2; Alexis Miroux3; Laurens Katgerman1; 1Delft University of Technology; 2Brunel University; 3Materials Innovation Institute

4:20 PM

Melt Conditioned Casting of Aluminum Alloys: Geoff Scamans1; Zhongyun Fan1; Hu-Tian Li1; 1BCAST

4:40 PM

1

Impact Toughness Enhancement of Melt Treated Al-Si-Mg Cast Alloy: Adel Mohamed1; F.H Samuel1; Saleh Alkahtani2; UQAC; 2Salman Bin Abdulaziz University

Coatings

Room: McKenna/Peter • University Student Center 1:20 PM

Invited: Measurements of Adhesion and Adhesion Degradation for Organic Coatings on Metals: Gerald Frankel1; B.C. Rincon Troconis1; J. Seong1; K.N. Win1; 1Ohio State University

2:00 PM

Analysis of Dimensional Distortion in 5XXX Alloys during Annealing for Organic Electronics Applications: Xiaoxiao Ma1; Miltiadis Hatalis1; Wojciech Misiolek1; Kirit Shah2; Thomas Levendusky2; 1Department of Electrical and Computer Engineering, Lehigh University; 2Alcoa Technical Center

2:20 PM

Initial Studies of 6082 Aluminium Thin Films: Jon Holmestad1; Øystein Dahl2; Sigmund Andersen2; Oddvin Reiso3; Randi Holmestad4; John Walmsley2; 1NTNU / Hydro Aluminium; 2SINTEF; 3Hydro Aluminium; 4NTNU

2:40 PM

High Dense RF-DC Plasma Nitriding of Al-Cu Alloys: Tatsuhiko Aizawa1; Yoshio Sugita2; 1Shibaura Institute of Technology; 2YS-Electronics, Co. Ltd.

3:00 PM

Break

3:20 PM

Cancelled: Production of Nanostructured Coatings and Composite Layers on Aluminum Surface: Sergey Romankov1; Sergey Komarov2; 1Chonbuk National University; 2Nippon Light Metal Co. Ltd

3:40 PM

Corrosion Resistance Improvement by Alodine EC2 Coating on Aluminum Alloys: Jianhui Shang1; Steve Hatkevich1; Larry Wilkerson1; 1American Trim LLC

4:00 PM

Finite Element Simulation of Shot Peening: Prediction of Residual Stresses and Surface Roughness: Alexandre Gariepy1; Claude Perron1; Philippe Bocher2; Martin Lévesque1; 1École Polytechnique de Montréal; 2École de Technologie Supérieure

Forming and Joining 1

Room: Rangos II • University Student Center 1:20 PM

Correlation of Fracture Behavior with Microstructure in Friction Stir Welded, and Spin-formed Al-Li 2195 Domes: Wesley Tayon1; Marcia Domack1; Stephen Hales1; 1NASA Langley Research Center

1:40 PM

Effect of Process Parameters on Microstructure Stability of FSW Butt Joints after Thermal Treatments: Emanuela Cerri1; Paola Leo1; 1University of Salento

2:00 PM

Microhardness Profile and Microstructure Characterization in Friction Stir Processing Zone of the Aged and Solid Solution Treated 7075 Aluminum Alloys: Zheng Zhou1; Sheng Chen1; Qing Liu1; 1Chongqing University

2:20 PM

Microstructure and Mechanical Properties of Dissimilar Friction Stir Welds Using AA6061-T6 and AZ31 Plates: Kwang-jin Lee1; Sang-Hyuk Kim1; Hyeon-Taek Son1; Kee-Do Woo2; 1Korea Institute of Industrial Technology; 2Chonbuk National University

2:40 PM

Microstructure and Mechanical Properties of Friction Stir Welded Aluminum Alloy/Stainless Steel Lap Joints: Tomo Ogura1; Taichi Nishida1; Hidehito Nishida2; Syuhei Yoshikawa2; Takumi Yoshida2; Noriko Omichi2; Mitsuo Fujimoto2; Akio Hirose1; 1Osaka University; 2Kawasaki Heavy Industries, LTD

3:00 PM

Break

3:20 PM

Microstructure Evolution of AA5083 during Friction Stir Welding: Jaehyung Cho1; Chang Gil Lee1; 1Korea Institute of Materials Science

3:40 PM

Cancelled: Study on the Quality of Friction Stir Welds Made on a Robot: Yousef Imani1; Michel Guillot1; 1Laval University

4:00 PM

The Effect of the Variation of Microstructure in the Friction Stir Welded Zone on the Strain and Tensile Properties of Al2139: Tomoko Sano1; Jian Yu1; Richard Chen1; Chian-Fong Yen1; 1US Army Research Laboratory

4:20 PM

The Effect of Welding Parameters and Tool Geometry on Formation of Tunneling Defects during Friction Stir Welding of AA 6061: Mansour Nikfarazari1; Seyed Mohammad Hosseini1; 1Imam Khomeini International University

4:40 PM

Hardening Potential of an Al-Cu-Li Friction Stir Weld: Rosen Ivanov1; Julien Boselli2; Diana Denzer2; Raynald Gauvin1; Mathieu Brochu1; 1McGill; 2Alcoa Inc.

Forming and Joining 2

Room: Rangos III • University Student Center Invited: Material Testing and Modeling of Aluminum Alloy Sheet in Support of Forming Simulations: Toshihiko Kuwabara1; Kengo Yoshida2; Daisaku Yanaga1; 1Tokyo University of Agriculture and Technology; 2Yamagata University

2:00 PM

Limitations of M-K Based Forming Limit Diagram Predictions: Mohsen Mohammadi1; Kaan Inal1; Raja Mishra1; 1University of Waterloo

2:20 PM

Evaluation of the Ring Compression Test for the Parameter Determination of Extended Friction Models: Dieter Horwatitsch1; Andreas Merstallinger2; Kurt Steinhoff3; 1LKR Leichtmetallkompetenzzentrum Ranshofen GmbH; 2Aerospace and Advanced Composites GmbH; 3Chair of Metal Forming Technology, University of Kassel

2:40 PM

Formability of Al-Mg (5052) Sheet with Ball-Wire Method: Ali Tajouri1; Basher Raddad1; 1University of Tripoli

3:00 PM

Break

3:20 PM

Accelerated Post-Weld Natural Ageing in Ultrasonic Welding Aluminium 6111-T4 Automotive Sheet: Phil Prangnell1; Yingchun Chen1; 1The University of Manchester

3:40 PM

Influence of Forming Conditions to Springback in V-bending Process Using Servo Press: Shinya Abe1; Susumu Takahashi1; 1Nihon University

4:00 PM

The Influence of Alloy Composition on the Microstructure, Tensile Ductility and Formability of 6xxx Alloys: Hao Zhong1; Paul Rometsch1; Yuri Estrin1; 1Monash University

13th International Conference on Aluminum Alloys

Technical Session Listing

1:20 PM

15

Novel Materials 1

Room: Dowd • University Student Center 1:20 PM

Invited: Nanostructured Materials: From the Nanoscale to the Microscale: Enrique J. Lavernia1; 1University of California, Davis

2:20 PM

Novel Cold Spray Nanostructured Aluminum: Victor Champagne1; Matthew Trexler; Yongho Sohn; George Kim2; 1US Army Research Lab; 2Perpetual Technologies, Inc.

2:40 PM

Fabrication of Nanostructural Aluminum Alloy Powder with Ball Milling Method: Han Yang1; Ruixiao Zheng1; Yanbo Yuan1; Xiaoning Hao1; Dan Wu1; Chaoli Ma1; 1Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University

3:00 PM

Break

3:20 PM

Production of Aluminum-Based Nano-Intermetallics by High-Pressure Torsion: Kaveh Edalati1; Zenji Horita1; 1Kyushu University

3:40 PM

Magnetism, Structural and Mechanical Behavior of Transitional Bulk Nanostructured Al Alloy: Rajath Hegde1; Surendranathan Orongil1; 1NITK Surathkal

4:00 PM

Microstructural Characteristics of High Rate Plastic Deformation in Al Trimodal Metal Matrix Composites: Clara Hofmeister1; Yongho Sohn1; Troy Topping2; Mark van den Bergh3; Kyu Cho4; 1University of Central Florida; 2Department of Chemical Engineering and Materials Science; 3DWA Aluminum Composites; 4U.S. Army Research Laboratory, Aberdeen Proving Ground

Phase Transformations 1

Technical Session Listing

Room: Connan • University Student Center

16

1:20 PM

Invited: Precipitation and Transformation of Metastable Phase in Al-Mg-Si Alloy: Kenji Matsuda1; 1University of Toyama

2:00 PM

Effects of Microalloying Elements (Cu, Ag) on Nanocluster Formation and Age-Hardening Behavior in Al-Mg-Si Alloys: JaeHwang Kim1; Calin Daniel Marioara2; Randi Holmestad3; Equo Kobayashi1; Tatsuo Sato1; 1Tokyo Institute of Technology; 2SINTEF; 3Norwegian University of Science and Technology (NTNU)

2:20 PM

Effect of Low Cu Amounts and Pre-Deformation on the Precipitation in Al-Mg-Si Alloys: Takeshi Saito1; Shinji Muraishi2; Calin Marioara3; Randi Holmestad1; 1Norwegian University of Science and Technology; 2Tokyo Institute of Technology; 3 SINTEF Materials and Chemistry

2:40 PM

High Resolution Characterization of the Precipitation Behavior of an Al-Zn-Mg-Cu Alloy: Yi-Yun Li1; Libor Kovarik2; Patrick Phillips1; Yung-Fu Hsu3; Wen-Hsiung Wang4; Michael Mills1; 1The Ohio State University; 2Pacific Northwest National Lab; 3National Taipei University of Technology; 4National Taiwan University

3:00 PM

Break

3:20 PM

The Effect of Y on the Microstructure and Properties of Al-Zr Alloy: Haiyan Gao1; Yongzhi Zhang1; Jun Wang1; Baode Sun1; 1Shanghai Jiao Tong University

3:40 PM

Precipitation Process in a High Mg to Cu Ratio Al-Mg-Cu-Ge Alloy: Junhai Xia1; Gang Sha1; Zhiguo Chen2; Simon. P. Ringer1; 1The University of Sydney; 2Central South University

4:00 PM

Investigations on the Precipitation in Al-Mg-Si Monocrystalline Model Alloy by Small Angle Neutron Scattering: Cynthia Chang1; Andre Heinemann2; Charles Dewhurst3; Zeqin Liang1; John Banhart1; 1Helmholtz-Zentrum Berlin für Materialien und Energie; 2Helmholtz-Zentrum Geesthacht; 3Institut Laue-Langevin

4:20 PM

Analytical Precipitate Model for AA3XXX Alloy: Emmanuel Hersent1; Jesper Friis2; Bjørn Holmedal1; Yanjun Li2; Knut Marthinsen1; 1NTNU; 2SINTEF

4:40 PM

Prediction of the Influence of Si Content on the Aging Behavior of Al-Mg-Si-Cu Alloys by Thermodynamic Modeling: Yanli Ji1; Hao Zhong2; Ping Hu1; Fuan Guo1; Hiromi Nagaumi1; 1Suzhou Nonferrous Metals Research Institute; 2Monash University

TMP 1

Room: McConomy Auditorium • University Student Center 1:20 PM

Invited: Hot Extrusion of Aluminum Chips: A. Tekkaya1; Volkan Güley1; Matthias Haase1; Andreas Jäger1; 1Technical University Dortmund

2:00 PM

3-Dimensional Microstructure of Al-Al3Ti Alloy Severely Deformed by ECAP: Hisashi Sato1; Takahisa Hishikawa1; Yuuki Makino1; Takahiro Kunimine1; Yoshimi Watanabe1; 1Nagoya Institute of Technology

2:20 PM

Abnormal Recrystallization Behavior of High Purity Aluminum Foil: Guangjie Huang1; Jing Zhang1; Yunlei Wang1; Qing Liu1; 1Chongqing University

2:40 PM

Effect of Annealing Condition on Earing and Texture Formation in Cold Rolled AA5182 Aluminum Alloy: Minemitsu Okada1; Seiichi Hirano1; 1Sumitomo Light Metal Industries, LTD.

3:00 PM

Break

3:20 PM

Effect of Quenching Wait Time on Microstructure and Mechanical Properties of As-extruded AA6063 Alloy: Yuna Wu1; Hengcheng Liao1; Jian Yang1; 1Southeast University

3:40 PM

Hot Deformation Behavior and Microstructural Evolution of Homogenized 7150 Aluminum Alloys Micro-Alloyed with Zr and V: Cangji Shi1; X. Grant Chen1; 1Université du Québec à Chicoutimi

4:00 PM

Modeling of Texture Evolution during Thermomechanical Processing in AA6xxx: Christian Bollmann1; Günter Gottstein1; Institute for Metallurgy and Metal Physics

1

4:20 PM

Orientation Effects in the Particle Stimulated Nucleation of Recrystallization: Lawrence Ko1; Joao Fonseca1; 1University of Manchester

4:40 PM

Structural Evolution in Aluminium Alloy AA 6082 during HPT Deformation at Increased Temperature: Jozef Zrnik1; Libor Kraus1; Stephan Scheriau2; Reinhard Pippan2; 1Comtes FHT, Inc.; 2Erich Schmid Institute of Materials Science, AA

TUESDAY AM Advanced Analysis Keynote

Room: Rangos I • University Student Center 8:15 AM

Keynote: Atom-Probe Tomography and the Science of a New Class of Al-Sc Based Alloys: David Seidman1; David Dunand1; 1Northwestern University

Advanced Analysis 1

Room: Wright • University Student Center 9:15 AM

Aberration-Corrected STEM Study of Precipitates in an Al-Mg-Si-Ge-Cu Alloy: Ruben Bjørge1; Sigmund Andersen2; Calin Marioara2; Joanne Etheridge3; Randi Holmestad1; 1Norwegian University of Science and Technology; 2SINTEF Materials and Chemistry; 3Monash University

9:35 AM

Application of Atom Probe Tomography for New Insights into Advanced Aluminium Alloy Technology: Gang Sha1; Simon Ringer1; 1The University of Sydney

9:55 AM

Break

10:25 AM

Diffraction-Amalgamated Grain-Boundary Tracking (DAGT) Technique and Its Application to an Aluminium Alloy: Darren LeClere1; Hiroyuki Toda1; Masakazu Kobayashi1; Takanobu Kamiko1; Yoshio Suzuki2; Akihisa Takeuchi2; Kentaro Uesugi2; 1 Toyohashi University of Technology; 2Japan Synchrotron Radiation Research Institute

10:45 AM

Effect of Composition and Pre-ageing on the Natural Ageing and Paint-baking Behaviour of Al-Mg-Si Alloys: Paul Rometsch1; Sam Gao1; Malcolm Couper1; 1Monash University High Resolution Microscopy of Al 2199 Alloy: Raynald Gauvin1; Nicolas Brodusch1; Mathieu Brochu1; Michel Trudeau1; McGill University

11:05 AM

1

11:25 AM

Nanoscale Precipitation-Strengthened Al-Sc-Ta Alloys: Keith Knipling1; 1Naval Research Laboratory

11:45 AM

Towards New Aluminium Alloys through Advances in Atom Probe Microscopy: Leif Viskari1; G. Sha1; S.P. Ringer1; 1The University of Sydney

Room: McConomy Auditorium • University Student Center 8:15 AM

Keynote: It’s Not Your Father’s Cast House Any More: Robert Wagstaff1; 1Novelis Solatens Technology Center

Casting & Solidification 2

Room: Rangos I • University Student Center 9:15 AM

Invited: Microstructural Modification Mechanisms and Integrated Thermal Management for Local Microstructure Control in Aluminum Castings: Ralph Napolitano1; T. Hosch1; D. Schuler1; 1Iowa State University

9:35 AM

The Grain Refinement of 7050 Alloy Using Al-5Ti-1B and Al-3Ti-0.15C Grain Refiners: Guo Shijie1; Xue Guanxia1; Ma Ke1; Nagaumi Hiromi1; 1Suzhou Institute of Nonferrous Metal Research

9:55 AM

Break

10:25 AM

Intermetallic Phase Formation in TP1 and DC Cast Billet of an AA 6063 Al Alloy: Akash Verma1; Sundaram Kumar1; Patrick Grant1; Keyna O’Reilly1; 1University of Oxford

13th International Conference on Aluminum Alloys

Technical Session Listing

Casting & Solidification Keynote

17

10:45 AM

The Effects of Mischmetal (Rare Earth) and Heat Treatment on the Structure and Tensile Properties of a New Super High Strength Alloy: Ali Ataei1; Masoud Emamy2; Alireza Hajaghasi3; Amin Bahrami4; 1South Tehran Branch, Islamic Azad University, Tehran, Iran; 2School of Metallurgy and Materials, University of Tehran, Tehran, Iran; 3Department of Engineering, Saveh Branch, Islamic Azad University; 4Imam Khomeini International University

11:05 AM

Grain Refining Potency of LaB6 on Aluminum Alloy: Pengting Li1; Wenjie Tian1; Dong Wang1; Xiangfa Liu1; 1Shandong University

11:25 AM

The Good Grain Refining Performance of a New Kind of Al-Ti-C-B Master Alloy: Jinfeng Nie1; Xiaoguang Ma1; Haimin Ding1; Xiangfa Liu1; 1Shandong University

Fatigue and Fracture Toughness 1

Room: Rangos III • University Student Center 9:15 AM

About the Challenge in Determing the Cyclic Material Behaviour of Aluminium Alloys for the Numerical Fatigue Analyses: Rainer Wagener1; C. Fischer2; A. Frohm2; H. Kaufmann1; 1Fraunhofer Institute for Structural Durability and System Releability LBF; 2TU Darmstadt, System Reliability and Machine Acoustics SzM

9:35 AM

A Microstructure Based Multi-Site Crack Growth Model: John Brockenbrough1; Hasso Weiland1; Joseph Fridy1; 1Alcoa Technical Center

9:55 AM

Break

10:25 AM

Short Fatigue Crack Growth Micromechanisms in a Cast Aluminium Piston Alloy: Thomas Mbuya1; Jennifer Crump1; Ian Sinclair1; Katherine Soady1; Rachel Thomson2; Philippa Reed1; 1University of Southampton; 2Loughborough University

10:45 AM

Fatigue Life of Ablation Cast 6061-T6 Components: Murat Tiryakioglu1; J. Campbell2; B. Cox3; P.D. Eason1; 1University of North Florida; 2University of Birmingham, UK; 3Alotech Ltd

11:05 AM

Mechanical Properties of Heat Exchanger Tube Materials at Elevated Temperatures: Sören Kahl1; Jozefa Zajac1; HansErik Ekström1; 1Sapa Technology

11:25 AM

Fatigue Behavior and Damage Monitoring of Welded Hybrid Joints: Frank Balle1; Stefan Huxhold1; Guntram Wagner1; Dietmar Eifler1; 1University of Kaiserslautern

Forming and Joining 3

Technical Session Listing

Room: Rangos II • University Student Center

18

9:15 AM

Anisotropy and Forming Limit Diagram Comparison of DC and CC 5xxx O Temper Aluminum Alloy Sheets: Xiyu Wen1; Yansheng Liu1; Shridas Ningileri2; Tongguang Zhai1; 1University of Kenyucky; 2Secat Inc.

9:35 AM

Comparison of Localized Deformation in Crystal Plasticity Based Finite Element Simulations between Experimentally Measured and Statistically Generated Three-Dimensional Microstructures for the Aluminum Alloy 5754: Jonathan Rossiter1; Abhijit Brahme1; Kaan Inal1; Raja Mishra2; 1Univeristy of Waterloo; 2General Motors Research and Development Center

9:55 AM

Break

10:25 AM

Invited: Path Independent Polar Effective Plastic Strain (PEPS) Diagram for Sheet Forming: Jeong Whan Yoon1; Thomas Stoughton2; 1Swinburne University; 2GM R&D Center

11:05 AM

From Forming Limit Curves to a Forming Limit Surface: Fadi Abu-Farha1; 1Penn State Erie

11:25 AM

Effect of Impact Compression on the Age-Hardening of Rapidly Solidified Al-Zn-Mg Base Alloys: Keitaro Horikawa1; Hidetoshi Kobayashi1; 1Osaka University

Forming and Joining 5

Room: McKenna/Peter • University Student Center 9:15 AM

Effect of Additional Element on Hybrid Laser Weldability in Al-Mn Alloys: Kenta Suzuki1; Hisashi Hori1; Keiji Kanamori1; Kazumitsu Mizushima1; Junichi Kinoshita2; Tooru Murata2; 1Nippon Light Metal Company, Ltd.; 2Shibaura Mechatronics Corporation

9:35 AM

Experimental and Numerical Analysis of Formation Manner of Characteristic Wavy Morphology in Impact Welded Similar- and Dissimilar-Metal Plates: Yuya Sawa1; Shougo Kakizaki1; Shinji Kumai1; 1Tokyo Institute of Technology

9:55 AM

Break

10:25 AM

Influences on Arc Stability in Welding of Aluminum Pin-Structures: Lukas Wittwer1; Nasrin Jank2; Almedin Becirovic2; Andreas Waldhör2; Norbert Enzinger1; 1Graz University of Technology; 2Fronius International

10:45 AM

Multiscale Characterization and Mechanical Modelling of an Al-Zn-Mg Electron Beam Weld: Quentin Puydt1; Alexis Deschamps2; Guillaume Parry2; Sylvain Flouriot3; Sylvain Ringeval3; 1CEA/SIMAP; 2SIMAP; 3CEA

11:05 AM

High Temperature Deformation Behavior of a 6N01 Aluminum Alloy Extrusion with a Seam Weld: Shinya Yasuda1; Ken Atsuta1; Satoshi Wakaguri1; Koji Ichitani1; Akira Hibino1; 1Furukawa-Sky Aluminum Corp.

11:25 AM

Simulation of Local Material Properties during Laser Beam Welding of Aluminum-Titanium Compounds: Annika Barr1; Martin Hunkel2; Axel von Hehl2; 1IWT - Foundation Institute of Materials Science/Lightweight Materials ; 2IWT - Foundation Institute of Materials Science/Lightweight Materials

11:45 AM

Finite Element Peen Forming Simulation: Alexandre Gariepy1; Simon Larose2; Claude Perron2; Philippe Bocher3; Martin Lévesque1; 1École Polytechnique de Montréal; 2Aerospace Manufacturing Technology Centre, National Research Council Canada; 3École de Technologie Supérieure

Novel Materials 2

Room: Dowd • University Student Center 9:15 AM

Invited: Microcellular Aluminium by Replication: Andreas Mortensen1; 1Ecole Polytechnique Fédérale de Lausanne (EPFL)

9:55 AM

Break

10:25 AM

Compression Properties of Fly Ash/Al Syntactic Foams: Qiang Zhang1; Linchi Zou1; Hang Su1; Gaohui Wu1; 1Harbin Institute of Technology

10:45 AM

Research on Preparation of Ti-Al Alloy by Thermit Reduction: Zhihe Dou1; Ting’an Zhang1; Zhaoyu Yang1; Jicheng He1; Northeastern University

1

11:05 AM

Self-Propagating Foaming Process of Al-Ti Reactive Precursor for Fabricating Long Scale Porous Materials: Makoto Kobashi1; Naoyuki Kanetake1; 1Nagoya University

11:25 AM

ALUHAB the Superior Aluminium Foam: Norbert Babcsán1; S. Beke1; P. Makk1; P. Soki1; Gy Számel1; H.P. Degischer2; R. Mokso3; 1Bay Zoltan Applied Research Nonprofit Ltd; 2TU-Vienna; 3SLS

Phase Transformations 2

Room: Connan • University Student Center 9:15 AM

Combined Effects of Low Temperature Aging and Sc Addition upon the Peak Aged Microstructure and Tensile Properties of Aluminium Alloys AA7010 and AA7017: A.K. Mukhopadhyay1; K.S. Prasad1; 1Defence Metallurgical Research Laboratory

9:35 AM

Continuous Heating Dissolution Diagrams of Aluminum Alloys: Benjamin Milkereit1; Julia Osten1; Christoph Schick1; Olaf Kessler1; 1University of Rostock

9:55 AM

Break

10:25 AM

Dynamic Room Temperature Precipitation during Cyclic Deformation of an Al-Zn-Mg Alloy: Christopher Hutchinson1; Fred De Geuser2; Alexis Deschamps2; 1Monash University; 2SIMAP, Grenoble INP, UJF, CNRS

10:45 AM

Effects of Pre-Aging Condition on Multi-Step Aging Behavior in Al-Mg-Si Alloy: Yasuo Takaki1; Tetsuya Masuda1; Equo Kobayashi2; Tatsuo Sato2; 1KOBE Steel, Ltd.; 2Tokyo Institute of Technology

11:05 AM

Hardening Response to Rapid Aging Processes and Precipitation in Al-7%Si-0.3%Mg Alloy: Hengcheng Liao1; Yuna Wu1; Ke Ding1; 1Southeast University

TMP 2

Room: McConomy Auditorium • University Student Center Capillary Tube Fabrication of A3003 Alloy for Air Condition: Hee Kyung Kim1; Guen-Ho Van1; Bong-Hak Seong1; Su-Gun Lim1; 1Gyeongsang National University

9:35 AM

A System for Continuous Extrusion Using High Pressure Molten Metal: Vivek Sample1; Ronald Chabal1; Vincient Paola1; Douglas Robosky1; 1Alcoa Technical Center

9:55 AM

Break

10:25 AM

Development of Multilayered Composite of 6061/2014 through ARB Process: Dharmendra Singh1; Nageswara Rao Palukuri1; Jayaganthan R1; 1IIT Roorkee

10:45 AM

Visualization of Material Flow in Friction Extrusion: Tony Reynolds1; Xiao Li1; 1University of South Carolina

11:05 AM

Heat Teatment of Aluminum Cast with Stir Zone Surface Layer Type Produced by FSP Method: Piotr Uliasz1; Tadeusz Knych1; Marek Blicharski1; Beata Smyrak1; Marzena Piwowarska1; 1AGH University of Science and Technology

11:25 AM

High-Pressure Torsion for Microstructure Control in Binary Al-Fe Alloys with Different States of Fe-Containing Phases: Jorge Cubero-Sesin1; Zenji Horita1; 1Kyushu University

13th International Conference on Aluminum Alloys

Technical Session Listing

9:15 AM

19

TUESDAY PM Advanced Analysis 2

Room: Wright • University Student Center 2:00 PM

Nano-scale Characterization of Al-Mg Nanocrystalline Alloys: Evan Harvey1; Leila Ladani1; 1University of Alabama

2:20 PM

In-Situ Tensile Stress Determination of an AA7xxx Alloy: Patrick Schloth1; Julia Repper2; Jean-Marie Drezet1; Vadim Davydov2; Helena Van Swygenhoven2; 1EPFL; 2Paul Scherrer Institut

2:40 PM

Muon Spin Relaxation and Positron Annihilation Spectroscopy Studies of Natural Aging in Al-Mg-Si Alloys: Sigurd Wenner1; Kenji Matsuda2; Katsuhiko Nishimura2; John Banhart3; Teiichiro Matsuzaki4; Dai Tomono4; Francis Pratt5; Meng Liu3; Yong Yan3; Calin Marioara6; Randi Holmestad1; 1NTNU; 2University of Toyama; 3Helmholtz-Zentrum Berlin; 4RIKEN Nishina Center for Accelerator Based Science; 5Rutherford Appleton Laboratory; 6SINTEF

3:00 PM

Break

3:30 PM

Monitoring Precipitation during Rapid Quenching of Aluminium Alloys by Calorimetric Reheating Experiments: Olaf Kessler1; Davit Zohrabyan1; Benjamin Milkereit1; Christoph Schick1; 1University of Rostock

3:50 PM

Hydrogen Depth-Profiling and Desorption Kinetics in Rapidly Solidified Al-Fe Alloys: Iya Tashlykova-Bushkevich1; Goroh Itoh2; 1Belarusian State University of Informatics and Radioelectronics; 2Ibaraki University

4:10 PM

Precipitation-Strengthened Al-Zr-Sc-Er Alloys with High Creep- and Coarsening-Resistance: David Seidman1; Chris Booth-Morrison1; David Dunand1; 1Northwestern University

4:30 PM

Research and Development of High-Strength of Al-Zn-Mg-Cu Alloys: Roman Vakhromov1; Vladislav Antipov1; Evgeniya Tkachenko1; 1FSUE VIAM

4:50 PM

Three-Dimensional Analysis of Microstructure in Cast Aluminium Piston Alloys: Thomas Mbuya1; Ian Sinclair1; Katherine Soady1; Philippa Reed1; 1University of Southampton

Casting & Solidification 3

Technical Session Listing

Room: Rangos I • University Student Center

20

2:00 PM

Characterization of Initial Ingot Microstructure: David Gildemeister1; 1Alcoa Technical Center

2:20 PM

The Evolution of Mushy Zones in Four Dimensions: A. Johnson1; J. Fife2; J. Gibbs1; L Aagesen3; M. Miksis1; E. Lauridsen4; Peter Voorhees1; 1Northwestern University; 2Paul Scherrer Institut; 3University of Michigan; 4Riso Laboratory for Renewable Energy

3:00 PM

Break

3:30 PM

The Interdependence Model: An Improved Predictor of Grain Size: David StJohn1; Mark Easton2; Ma Qian1; 1University of Queensland; 2Monash University

3:50 PM

Simulation of Dendrite Growth in Solidification of Al–3.0 wt.% Cu Alloy Using Cellular Automaton and Phase-Field Methods: Mohsen Asle Zaeem1; Hebi Yin2; Sergio Felicelli1; 1Mississippi State University; 2Oak Ridge National Laboratory

4:10 PM

Twinned Dendrite Formation in Al-Zn-Cr under Unusual Solidification Conditions: Güven Kurtuldu1; Philippe Jarry2; Michel Rappaz1; 1Computational Materials Laboratory, Ecole Polytechnique Fédérale de Lausanne, Station 12, CH-1015 Lausanne, Switzerland; 2Constellium CRV, ZI Centr’alp, 0725 rue Aristide Berges, BP 27, Voreppe, FR-38341, France

4:30 PM

Analysis of Dendritic Primary Al Grain Ripening and Solid Fraction Measurement in A356 Alloy Semi-Solid Slurry Using Segregation Sensitive Reagent: Li Gao1; Yohei Harada1; Shinji Kumai1; 1Tokyo Institute of Technology

4:50 PM

A Dual-Scale Segregation Model for the Direct Chill Casting Process: Ravindra Pardeshi1; Simon Barker2; Biswajit Basu1; Mark Gallerneault3; 1Aditya Birla Science & Technology Co. Ltd; 2Novelis Global Technology Center, ; 3Novelis Global Technology Center

Fatigue and Fracture Toughness Keynote Room: Rangos I • University Student Center 1:15 PM

Keynote: Fracture Mechanisms in Al-Cu-Li Alloys: Jean-Christophe Ehrstrom1; B. Bès1; J. Chevy1; F. Eberl2; 1Constellium CRV; 2Constellium Usine d’Issoire

Fatigue and Fracture Toughness 2

Room: Rangos III • University Student Center 2:00 PM

Invited: Material and Structural Simulation Methodology Advancements for Fatigue and Damage Tolerant Critical Aircraft Structures– an Aluminum Supplier Perspective: Robert Bucci1; M. A. James1; M. Kulak1; M. B. Heinimann1; 1Alcoa Technical Center

2:40 PM

Fatigue Resistance of Al-Cu-Li and Comparison with 7xxx Aerospace Alloys: Armelle Daniélou1; Jean-Christophe Ehrström1; Jean-Patrick Ronxin1; 1Constellium-CRV

3:00 PM

Break

3:30 PM

Fatigue Crack Growth Behavior of 2099-T83 Extrusions in Two Different Environments: Franck Armel Tchitembo Goma1; Daniel Larouche1; Alexandre Bois-Brochu1; Carl Blais1; Julien Boselli2; Mathieu Brochu3; 1REGAL-Aluminium Research Centre, Université Laval; 2Alcoa Technical Center; 3REGAL-Aluminium Research Centre, McGill University

3:50 PM

Influence of Microstructure on the Fretting Resistance of Al-Cu-Li Alloys: Jessica Delacroix1; Sophie Cazottes1; Armelle Danielou2; Siegfried Fouvry3; Jean-Yves Buffiere4; 1Universite de Lyon INSA LYON; 2Constellium; 3Ecole Centrale de Lyon ; 4Universite de Lyon INSA LYON

4:10 PM

Al-Li-Cu-Mg-(Ag) Products for Lower Wing Skin Applications: Lynne Karabin1; Gary Bray1; Roberto Rioja1; Greg Venema2; 1Alcoa Technical Center; 2Alcoa Mill Products

4:30 PM

Development of High Toughness Sheet and Extruded Products for Airplane Fuselage Structures: Paul Magnusen1; Dirk Mooy1; Les Yocum1; Roberto Rioja1; 1Alcoa

4:50 PM

Expanding the Availability of Lightweight Aluminum Alloy Armor Plate Procured from Detailed Military Specifications: Kevin Doherty1; Richard Squillacioti2; Bryan Cheeseman2; Brian Placzankis2; Denver Gallardy2; 1US Army Research Laboratory; 2US Army Research Laboratory

Forming and Joining 4

Room: Rangos II • University Student Center 2:00 PM

Fatigue and Creep Properties of Al-Si Brazing Filler Metals: Masakazu Edo1; Masatoshi Enomoto2; Yoshimasa Takayama3; 1Mitsubishi Aluminum Co.Ltd; 2Japan Light Metal Welding Association; 3Utsunomiya University

2:20 PM

Effect of Additional Elements of Al-Si Filler Alloy on Flowability and Clearance Fillability during Brazing: Masakazu Edo1; Michihide Yoshino1; Shuu Kuroda1; 1Mitsubishi Aluminum Co.Ltd

2:40 PM

Influence of Erosion Phenomenon on Flow Behavior of Liquid Al-Si Filler Between Brazed Components: Takahiro Izumi1; Toshiki Ueda1; 1Kobe Steel, Ltd.

3:00 PM

Break

3:30 PM

Effects of Plate Thickness and Projection Shape on the Microstructure and Strength of High-Speed Solid-State Joined 2024 Alloy Studs and 5052 Alloy Plates: Shinji Kumai1; Keisuke Hayashida1; Kento Takaya1; 1Tokyo Institute of Technology

3:50 PM

Interfacial Reaction during Dissimilar Joining of Aluminum Alloy to Magnesium and Titanium Alloys: Joseph Robson1; Chaoqun Zhang1; Alexandra Panteli1; Dolhats Baptiste2; Emma Cai3; Philip Prangnell1; 1University of Manchester; 2Université de Nantes; 3Altrincham Girls’ Grammar School

4:10 PM

Joining of 2024 Aluminum Alloy Stud to AZ80 Magnesium Alloy Extruded Plate by Advanced High-Speed Solid-State Method: Yohei Harada1; Yutaro Sada1; Shinji Kumai1; 1Tokyo Institute of Technology

4:30 PM

Interface Structure and Bonding in Rapid Dissimilar FSSW of Al to Steel Automotive Sheet: Phil Prangnell1; Yingchun Chen1; 1The University of Manchester

4:50 PM

Cancelled: Simultaneous Behavior of Foaming and Bonding for Aluminum Foam Panel: Yuko Okano1; Yuji Kume1; Makoto Kobashi1; Naoyuki Kanetake1; 1Nagoya University

Forming and Joining 6

Room: McKenna/Peter • University Student Center Changes in Microstructure During High Strain Rate Superplastic Deformation of an Al-Zn-Mg-Cu-Zr Alloy Containing Sc: A.K. Mukhopadhyay1; K.S. Prasad1; A. Kumar1; S. Raveendra2; I. Samajdar2; 1Defence Metallurgical Research Laboratory; 2Indian Institute of Technology Bombay

2:20 PM

Investigation of Superplasticity in Aluminum Alloy 5083: Shasha Zhao1; Rehan Qayyume1; Haoyan Diao1; Chaoli Ma1; Yong Wang2; Xiaowei Wu2; 1Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University; 2Beijing Research Institute of Mechenical & Electrical Technology

2:40 PM

Microstructure Evolution and Tensile Property of Al-4.35Cu-1.53Mg Alloy during Creep Age Forming Process: Shanshan Wang1; Jiantang Jiang1; Kun Zhang2; Junzhou Chen2; Liang Zhen1; 1Harbin Institute of Technology; 2Beijing Institute of Aeronautical Materials

3:00 PM

Break

3:30 PM

New Analysis of Solute Drag in AA5754 by Precise Determination of Point Defect Generation and the Orowan Relation: Brad Diak1; Alex Penlington1; Shig Saimoto1; 1Queen’s University

3:50 PM

Cancelled: The Effect of Grain on Strain Localization and Damage under Uniaxial Tensile Loading of A356 Alloy: Mahmoud Marzouk1; Mukesh Jain1; Sumanth Shankar1; 1McMaster Univeristy

13th International Conference on Aluminum Alloys

Technical Session Listing

2:00 PM

21

4:10 PM

The Influence of Microstructure and Composition on the Machinability of Al-Si Alloys: Yasser Zedan1; A.M. Samuel1; Fawzy Samuel1; S. Alkahtani2; 1UQAC; 2Salman Bin Abdulaziz University, AlKharj, Saudi Arabia

4:30 PM

Cancelled: Effects of Electric Currents on the Mechanical Behavior of Two Different Aluminum Alloys under Quasi-Static Uni-Axial Tensile Loads: Jeong-Jin Seo1; Jae-Hun Roh1; Yong-Ha Jeong1; Sung-Tae Hong1; John Roth2; 1University of UIsan; 2Penn State Erie, The Behrend College

4:50 PM

Modeling of Transients as a Response to Changes in Strain-Path of Commercially Pure Aluminium: Tomas Manik1; Bjørn Holmedal1; Odd Sture Hopperstad1; 1Norwegian University of Science and Technology

Novel Materials 3

Room: Dowd • University Student Center 2:00 PM

Invited: Enhanced Performance of Layered/Laminated Aluminum Systems: John Lewandowski1; 1Case Western Reserve University

2:40 PM

Microstructures and Mechanical Properties of Al-Al2O3 Composites Processed by Disk-HPT and Ring-HPT: Maki Ashida1; Zenji Horita1; 1Kyushu University

3:00 PM

Break

3:30 PM

Powder Metallurgy of High Strength Al84Gd6Ni7Co3 Gas-atomized Powder: Prashanth K G1; K.B. Surreddi2; Sergio Scudino1; Zhi Wang1; D. J. Sordelet3; Jürgen Eckert1; 1IFW Dresden; 2Chalmers University of Technology; 3Advanced Materials Technology Group, Caterpiller Inc.

3:50 PM

Advanced Class of FML on the Base Al-Li Alloy 1441 with Lower Density: Vladislav Antipov1; Olga Senatorova1; Nataly Lukina1; 1FSUE VIAM

4:10 PM

The Preparing Technology of Cu-Al Dual Metal Composite Material via Electrodeposition Method: Yihan Liu1; Jing Li1; Ming Zhao1; 1Northeastern University

4:30 PM

Cancelled: Properties of Aluminum Based Magnetic Materials Produced by Compressive Torsion Processing: Gaku Sogabe1; Yuji Kume2; Makoto Kobashi2; Naoyuki Kanetake2; 1Nagoya University ; 2Nagoya University

4:50 PM

Solute Distribution and Mechanical Properties of Ultra-Fine-Grained Al-Mg Alloys: Richard Karnesky1; Nancy Yang1; Chris San Marchi1; Troy Topping2; Zhihui Zhang2; Ying Li2; Enrique Lavernia2; 1Sandia National Laboratories; 2University of California, Davis

Phase Transformations Keynote

Room: McConomy Auditorium • University Student Center 1:15 PM

Keynote: Nanocluster Formation Behavior in Al-Zn-Mg Alloys with Microalloying Elements and Improved Mechanical Properties: Tatsuo Sato1; Tomo Ogura2; 1Tokyo Institute of Technology; 2Osaka University

Phase Transformations 3

Technical Session Listing

Room: Connan • University Student Center

22

2:00 PM

The Effect of Natural Aging on Quench Sensitivity in Al-Mg-Si Alloys: Katharina Strobel1; Mark Easton1; Lisa Sweet1; Nick Parson2; 1CAST CRC - Monah University; 2Rio Tinto Alcan

2:20 PM

Thermodynamics of Al3Li Nano-Clusters in an Aluminum Solid Solution: Christophe Sigli1; Joël Lépinoux2; 1Constellium CRV; 2SIMAP INP Grenoble

2:40 PM

The Effect of Cu and Cr on Clustering and Precipitation in Al-Mg-Si Alloys: Zeqin Liang1; Cynthia Sing Ting Chang1; John Banhart1; Jürgen Hirsch1; 1Helmholtz Center Berlin for Material and Energy

3:00 PM

Break

3:30 PM

Influence of Mg and Si on Cluster Formation in Al-Mg-Si Alloys Studied by Positron Annihilation Lifetime Spectroscopy: Meng Liu1; Yong Yan2; Zeqin Liang1; Cynthia Chang1; John Banhart1; 1Helmholtz Centre Berlin for Materials and Energy; 2 Technische Universität Berlin

3:50 PM

Microstructural Characterization of Flexcast® Al-Mg Alloys with Sc and Zr Additions: Dae Hoon Kang1; Mojan Sohi2; Hashem Mousavi Anijdan1; Nitin Singh1; Mark Gallerneault1; 1Novelis Inc.; 2University of British Columbia

4:10 PM

Application of an Isothermal Calorimetry Technique to Determine TTP Diagrams for AA6xxx Alloys: Leo Colley1; Nitin Singh1; Cyrille Bezençon1; 1Novelis Inc.

4:30 PM 4:50 PM

Influence of Chemical Composition on Aging Property of 7204 Aluminum Alloy: Tadashi Minoda1; Hideo Yoshida1; Sumitomo Light Metal Industries, Ltd.

1

Transforming of the Morphology of Iron Phases in Aluminum Alloys: Vladimir Cheverikin1; Vadim Zolotorevskiy1; Alexandra Khvan1; 1National University of Science and Technology “MISiS”

TMP 3

Room: McConomy Auditorium • University Student Center 2:00 PM

Process Analysis of the Co-Extrusion of Aluminum and Titanium Alloys: Norbert Grittner1; Barbara Striewe2; Martin Hunkel2; Marcus Engelhardt1; Christian Klose1; Axel von Hehl2; Mirko Schaper1; Hans-Werner Zoch2; Friedrich-Wilhelm Bach1; 1Leibniz Universität Hannover Institut für Werkstoffkunde; 2IWT Stiftung Institut für Werkstofftechnik

2:20 PM

Rheo-Extrusion of Hypoeutectic Al-Si-Mg-Fe Alloy: Yasuhiro Uetani1; Nanako Mori2; Masayoshi Dohi3; Kenji Matsuda2; Susumu Ikeno4; 1Toyama Prefectural University; 2University of Toyama; 3Sankyo Materials Co. Ltd.; 4Toyama College of Technology

2:40 PM

Simultaneous Improvement of Strength and Ductility in Al-Ag Alloys Processed by High-Pressure Torsion and Aging: Seungwon Lee1; Zenji Horita1; 1Kyushu University

3:00 PM

Break

3:30 PM

Microstructural and Mechanical Evolutions during the Forging Step of the COBAPRESS, a Casting/Forging Process: Frederic Perrier1; Christophe Desrayaud1; Véronique Bouvier2; 1Ecole Nationale Supérieure des Mines de Saint-Etienne, Laboratoire Claude Goux UMR CNRS 5146; 2Saint-Jean Industries

3:50 PM

The Bonding Behavior of Co-Extruded Aluminum-Titanium-Compounds: Barbara Striewe1; Martin Hunkel1; Axel von Hehl1; Norbert Grittner2; 1Foundation Institute of Materials Science / Lightweight Materials; 2Institute of Materials Science, Hannover

4:10 PM

The Effect of Heat Treatment Technology on Mechanical Properties of Al/Al Alloys Clad Sheet Fabricated by Hot Roll Bonding: Zejun Chen1; Quanzhong Chen1; Qing Liu1; 1Chongqing University

4:30 PM

Orientation Dependent Subgrain Growth During Isothermal Annealing of High-Purity Aluminum: Sindre Bunkholt1; Knut Marthinsen1; Erik Nes1; 1NTNU

4:50 PM

Effect of Nickel Variation and Thermomechanical Treatment on Microstructure and Properties in Aluminum Alloy Fin Stock for Heat Exchanger: Suk-Bong Kang1; Dong-Bae Kim1; Jaehyung Cho1; 1Korea Institute of Materials Science

Wednesday AM Casting & Solidification 4

Room: Rangos I • University Student Center 9:15 AM

Invited: Microstructure Development and Control in Hypereutectic Cast Al-Si Alloy Evaluated by Metallurgical Analysis and Neutron Diffraction: Wojciech Kasprzak1; Dimitry Sediako2; Hirotaka Kurita3; 1Natural Resources Canada; 2National Research Council; 3Yamaha Motor Co. Ltd.

9:55 AM

Break

10:25 AM

Semi-Solid Forming of A356 Al Alloy by Rapid Slurry Forming Process: Sumit Sharma1; Ashok Sharma1; Subodh Kumar2; Malviya National Institute of Technology; 2Indian Institute of Science

1

10:45 AM

Assessment of the Al–Ni–Mn–Fe–Si–Zr Phase Diagram for New-Generation Heat-Resistant Casting Aluminum Alloys: Nikolay Belov1; Alexander Alabin2; 1National University of Science and Technology “MISIS”; 2National University of Science and Technology “MISIS”

11:05 AM

Influence of the Fe Content, Mn/Fe Ratio and Cooling Rate on the Modification Process of Fe Intermetallic Compounds in Hypoeutectic Al-Si Alloys: Zhijun Zhang1; Equo Kobayashi1; Hiroyasu Tezuka1; Tatsuo Sato1; 1Tokyo Institute of Technology

Room: McKenna/Peter • University Student Center 9:15 AM

Invited: Defining the Property Space and the Role of Basic Microstructure and Chemistry on Corrosion: Rudolph Buchheit1; N.L. Sukiman2; N. Birbilis2; 1The Ohio State University; 2Monash University

9:55 AM

Break

10:25 AM

Influence of Magnesium Content and Heat Treatment on the Intergranular Corrosion OF 5083 Alloy H321 and H116 Temper: Mihaela Aurora Pana1; Petru Moldovan1; Carmen Nicoleta Stanica2; Iulian Vasile Antoniac1; 1Universitatea Politehnica din Bucuresti; 2VIMETCO ALRO SLATINA

10:45 AM

Quantification of Intergranular Corrosion Susceptibility Dependence on Sample Orientation in Aluminum Alloy 5083H131: Trevor Hunt1; Amy Laspe1; Young-Ki Yang1; Todd Allen1; 1University of Wisconsin

11:05 AM

Precipitation of the ß-phase and Corrosion Behavior of an Al-6.8 wt.% Mg Alloy: Miljana Popovic1; Tamara Radetic2; Endre Romhanji1; 1University of Belgrade, Faculty of Technology & Metallurgy; 2University of Belgrade, Faculty of Tecnology & Metallurgy; NCEM LBL, Berkeley, USA

13th International Conference on Aluminum Alloys

Technical Session Listing

Corrosion 1

23

11:25 AM

Effect of Three-Dimensional Grain Boundary Structure, Crystallography and Chemistry on Sensitization in Al-Mg Alloys: Keith Knipling1; Alexis Lewis1; 1Naval Research Laboratory

Fatigue and Fracture Toughness 3

Room: Rangos III • University Student Center 9:15 AM

Origin of Ductile Fracture in Aluminum Alloys: Hiroyuki Toda1; Hideyuki Oogo1; Hideki Tsuruta1; Keitaro Horikawa2; Kentaro Uesugi3; Akihisa Takeuchi4; Yoshio Suzuki4; Masakazu Kobayashi1; 1Toyohashi University of Technology; 2Osaka University; 3Japan Synchrotron Radiation Research Institute ; 4Japan Synchrotron Radiation Research Institute Threshold Stress of A3003 Alloy: Makoto Ando1; Yoshikazu Suzuki1; Goroh Itoh2; 1Furukawa-sky Aluminum Corp.; Ibaraki University

9:35 AM

2

9:55 AM

Break

10:25 AM

Ultrasonic Fatigue of SiC Particle Reinforced Aluminum in the VHCF Regime: Guntram Wagner1; Dietmar Eifler1; Matthias Wolf1; 1University of Kaiserslautern

10:45 AM

Influence of Strain Hardening on Rheological Properties of AlMgSi Wires: Beata Smyrak1; Tadeusz Knych1; Kinga Korzen1; 1AGH - University of Science and Technology

11:05 AM

On the Effect of Pre-Strain and Strain-Path Changes on Void Growth and Linkage in AA5052 Model Materials: Yaser Alinaqian1; Mahyar Asadi1; Arnaud Weck1; 1University of Ottawa

11:25 AM

A 3-D Quantitative Crystallographic Model for Short Fatigue Crack Propagation through Grain Boundaries in High Strength Al Alloys: Wei Wen1; A.H.W. Ngan2; Tongguang Zhai1; 1University of Kentucky; 2The University of Hong Kong

Forming and Joining Keynote

Room: McConomy Auditorium • University Student Center 8:15 AM

Keynote: Meeting Vehicle Lightweighting Challenges with Aluminum: Anil Sachdev1; Raja Mishra; Anirban Mahato2; Ahmet Alpas3; 1GM; 2Purdue University; 3University of Windsor

Forming and Joining 7

Room: Rangos II • University Student Center 9:15 AM

A New Crystal Plasticity Based Constitutive Model Incorporating Backstress for FCC Polycrystals: Abhijit Brahme1; Raja Mishra2; Kaan Inal1; 1University of Waterloo; 2General Motors Research and Development Center

9:35 AM

Crystal Plasticity Analysis of Constitutive Behavior of 5754 Aluminum Sheet: Lin Hu1; Anthony Rollett1; Timothy Foecke2; Mark Iadicola2; 1Carnegie Mellon University; 2NIST

9:55 AM

Break

10:25 AM

Crystal Plasticity Simulation of Deformation Behavior in Polycrystalline Aluminum: LiangXing Lv1; Liang Zhen1; Wenzhu Shao1; 1Harbin Institute of Technology

10:45 AM

Numerical Analysis of Surface Roughening and Necking in Aluminum Alloy Tubes Under Internal Pressure: Yihai Shi1; Peidong Wu2; David Lloyd1; 1Novelis Global Technology Centre; 2McMaster University

11:05 AM

Polycrystal-Plasticity Simulation of Roping in AA6xxx Automotive Sheet Alloys: Olaf Engler1; Carmen Schäfer1; Henk-Jan Brinkman1; 1Hydro Aluminium Rolled Products GmbH

Technical Session Listing

11:25 AM

24

Properties of Free-Machining Aluminum Alloys at Elevated Temperatures: Jiri Faltus1; Miroslav Karlik2; Petr Hausild2; Research Institute for Metals; 2Czech Technical University in Prague

1

ICME Keynote

Room: Rangos I • University Student Center 8:15 AM

Keynote: Develop ICME Tool for High Ductility Cast Aluminum Alloys for Automotive Body Applications: Mei Li1; J. Zindel1; L. Godlewski1; Xuming Su1; 1Ford Motor Company

ICME 1

Room: Dowd • University Student Center 9:15 AM

Utilisation of Atom Probe Data to Model Precipitation and Strengthening in an Al-Mg-Si-Cu Alloy During Natural Ageing and Early-Stage Artificial Ageing: Dacian Tomus1; Paul Rometsch1; Malcolm Couper1; Chris Davies1; Lingfei Cao1; 1 Monash University

9:35 AM

Ab Initio Simulations of Vacancy-Solute Clusters in Al-Mg-Si and Al-Zn-Mg Alloys: Peter Lang1; Peter Mohn2; Ahmad Falahati2; Ernst Kozeschnik2; 1Materials Center Leoben Forschungs GmbH; 2Vienna University of Technology

9:55 AM

Break

10:25 AM

Modeling Precipitation in Al-Mg-Si Alloy – the Effect of Deformation: Ahmad Falahati1; Mathieu Bolez2; Mohammad Ahmadi1; Jun Wu1; Ernst Kozeschnik1; 1Vienna University of Technology; 2Ecole Polytechnique de l’université de Nantes

10:45 AM

Modeling the Precipitation Behavior of Semi-Stoichiometric Dispersoids in 3xxxx Aluminium Alloys: Yanjun Li1; Arild Håkonsen2; Dag Mortensen3; Trond Furu4; 1SINTEF Materials and Chemistry; 2Hydro Aluminium, Hycast; 3Institute for Energy Technology; 4Hydro Aluminium, RTD

11:05 AM

The Role of the Si Network to the Stabilization of Hardening Precipitates in the Al-Mg-Si(-Cu) Alloy System: Flemming Ehlers1; Sigurd Wenner1; Sigmund Andersen2; Calin Marioara2; Randi Holmestad1; 1Norwegian University of Science and Technology, NTNU; 2SINTEF

11:25 AM

Residual Stress Analysis in AA7449 As-Quenched Thick Plates Using Neutrons and Fe Modelling: Nicolas Chobaut1; Julia Repper2; Thilo Pirling3; Denis Carron4; Jean-Marie Drezet1; 1EPF Lausanne; 2Paul Scherrer Institut; 3Institut LaueLangevin; 4LIMatB, Université de Bretagne-Sud

Phase Transformations 4

Room: Connan • University Student Center 9:15 AM

Invited: Precipitation in Al-Cu-Li Alloys: from the Kinetics of T1 Phase Precipitation to Microstructure Development in Friction Stir Welds: Alexis Deschamps1; Frédéric De Geuser2; Benoît Malard1; 1Grenoble Institute of Technology; 2SIMAP - CNRS

9:55 AM

Break

10:25 AM

Phase Coarsening in Al-Li Binary Alloys: Martin Glicksman1; Ke-Gang Wang Wang1; Ben Pletcher2; 1Florida Institute of Technology; 2Chicago Bridge and Iron

10:45 AM

Quantitative Description of the T1 Morphology and Strengthening Mechanisms in an Age-hardenable Al-Li-Cu Alloy: Thomas Dorin1; Alexis Dechamps2; Frédéric De Geuser2; Matthew Weyland3; 1Constellium CRV and SIMAP; 2SIMAP; 3 Monash Centre for Electron Microscopy, Department of Materials Engineering

11:05 AM

Orientation Relationship of Dispersoids Precipitated in an AA3xxx Alloying during Annealing at Low Temperatures: Astrid Marie Muggerud1; Yanjun Li2; Randi Holmestad1; 1Norwegian University of Science and Technology, NTNU; 2SINTEF Materials and Chemistry

11:25 AM

Hf-Containing Precipitates in Al-Si-Mg-Hf Alloy during Heat Treatments at 400oC-560oC: Zhihong Jia1; Zhijie Chen1; Lars Arnberg2; Petter Asholt3; Qing Liu1; Guangjie Huang1; 1Chongqing University; 2Norwegian University of Science and Technology; 3Hydro Aluminium

TMP 4

Room: McConomy Auditorium • University Student Center 9:15 AM

A Study of the Influence of Plastic Pre Strain in Different Directions before Aging of Extruded and Hydro Formed Material on the Mechanical Properties of AA6063: Sten Johansson1; Jan Kanesund1; 1Linköping University

9:35 AM

The Effects of Transition Elements on the Control of Recrystallization of Al-Zn-Mg Extrusion: Yukimasa Miyata1; Shinji Yoshihara1; 1KOBE STEEL, LTD.

9:55 AM

Break

10:25 AM

Characterization of the Artificial Aging Behavior and Formability of a High Strength EN AW-6016 at Different Heat Treatment Conditions Used for Automotive Applications: Ramona Prillhofer1; Josef Berneder1; Dirk Uffelmann1; Peter Schulz1; Carsten Melzer2; 1AMAG Rolling GmbH; 2AMAG Metall GmbH (AMAG) Low Work Hardening And Its Mitigation In Ultra-Fine Grained Al Alloys: Haiou Jin1; Mark Gallerneault1; David Lloyd1; Novelis Inc

1

11:05 AM

The Influence of Initial Microstructure on the Recrystallization Behaviour of Cold-rolled AA3003: Payman Babaghorbani1; Warren Poole1; Mary Wells2; Nick Parson3; 1University of British Columbia; 2University of Waterloo; 3Rio Tinto Alcan

11:25 AM

Mechanical Properties of Multilayer 1100/7075 Aluminum Sheet Produced by Hot ARB: Kawunga Nyirenda1; Zejun Chen1; Quanzhong Chen1; Qing Liu1; 1Chongqing University

TMP 6

Room: Wright • University Student Center 9:15 AM

A Study of the Influence of Strain Hardening and Precipitation Hardening Sequence on Mechanical Properties of AlMgSi Conductor Alloys: Beata Smyrak1; Tadeusz Knych1; Andrzej Mamala1; Kinga Korzen1; Piotr Osuch1; 1AGH - University of Science and Technology

9:35 AM

Behaviors of 7055 Aluminum Alloy in Retrogression and Re-Aging Treatment: Nie Baohua1; Liu Peiying2; Zhou Tietao2; 1 BeiHang University; 2BeiHang University

9:55 AM

Break

13th International Conference on Aluminum Alloys

Technical Session Listing

10:45 AM

25

10:25 AM

Characterization of Pre-Aged AA6061-T6 Sheet Material for Aerospace Applications: Josef Berneder1; Ramona Prillhofer2; Peter Schulz2; Carsten Melzer3; 1AMAG Rolling; 2AMAG Rolling GmbH; 3Austria Metall GmbH (AMAG)

10:45 AM

Controlled Quenching of Aluminum Alloys in Flexible Spray Fields: Andrea Rose1; Sven Schuettenberg1; Nils Hornig1; Axel von Hehl1; Udo Fritsching1; 1Foundation Institute for Materials Science

11:05 AM

Effect of Coarse Particles on Work Hardening in the Al-Mn Alloy: Shingo Iwamura1; Kazuyo Ogawa1; 1Sumitomo Light Metal Industries, LTD.

11:25 AM

Precipitation Behavior of Dispersoids in Al-Mg-Si-Cu-Mn-Cr Alloy during Homogenization Annealing: Yi Han1; Ke Ma1; Chuyan Wang1; Hiromi Nagaumi1; 1Suzhou Research Institute for Nonferrous Metals

Wednesday PM Casting & Solidification 5

Room: Rangos I • University Student Center 2:00 PM

Thixoforming of Al-Mg2Si Composite Feedstock Produced by Cooling Slope Casting: Farzin Sahihi1; Ehsan Parshizfard2; Saeed Shabestari3; Hasan Saghafian3; 1MIGT Co.; 2NMI Co.; 3IUST University

2:20 PM

The Influence of Heat Treatment Parameters on the Electrical Conductivity of AlSi7Mg and AlSi10Mg Aluminum Cast Alloys: Piotr Uliasz1; Tadeusz Knych1; Marzena Piwowarska1; Justyna Wiechec1; 1AGH University of Science and Technology

2:40 PM

Effect of Oxide Level on Pore Formation in A356 Alloy by X-Ray Imaging and Direcctional Solidification Technology: Hengcheng Liao1; Wan Song1; Qigui Wang2; Lei Zhao1; Ran Fan1; 1Southeast University; 2GM Global Powertrain Engineering

3:00 PM

Break

3:30 PM

Increased Production and Quality with Reduced Operating Costs and Emissions in Aluminum Melting Using High Temperature Oxygen Analyzers: Yvonne Boltz1; Brien Knight1; 1United Process Controls, MMI

3:50 PM

The Effect of Nickel on the Thermal Conductivity of Al-Si Cast Alloys: Florian Stadler1; Helmut Antrekowitsch1; Werner Fragner2; Helmut Kaufmann3; Peter J. Uggowitzer4; 1Montanuniversitaet Leoben; 2AMAG Casting GmbH; 3AMAG Austria Metall AG; 4ETH Zurich

4:10 PM

Production of Single Cylinder Engine Piston through Vacuum Die Casting in Sedi Enugu: Emmanuel Nwonye1; Christian Nwajagu1; 1Scientific Equipment Development Institute

4:30 PM

Fatigue Behavior in Rheocast Aluminum 357 Suspension Arms Using the SEED Process: Ehab Samuel1; Chang-Qing Zheng1; Amine Bouaicha2; Mohamed Bouazara3; 1National Research Council Canada; 2Université du Québec à Chicoutimi ; 3Université du Québec à Chicoutimi

Corrosion 2

Technical Session Listing

Room: McKenna/Peter • University Student Center

26

2:00 PM

Defining the Property Space and the Role of Basic Microstructure and Chemistry on Corrosion: Nick Birbilis1; N. Sukiman1; R. Buchheit2; 1Monash University; 2The Ohio State University

2:40 PM

Testing the Corrosion Behavior of Plated Aluminum Strips for Heat Exchangers Operating in the Automotive Industry: Marek Nowak1; Mieczyslaw Opyrchal1; Andrzej Klyszewski1; Janusz Zelechowski1; 1Institute of Non Ferrous Metals in Gliwice

3:00 PM

Break

3:30 PM

Crystallographic Orientation Dependence of Corrosion Behavior of 5N Purity Aluminum in Different Concentrations of HCl Aqueous Solutions: Yoshimasa Takayama1; Masayuki Sato1; Hideo Watanabe1; 1Utsunomiya University

3:50 PM

Corrosion Protection of Light Alloys using Low Pressure Cold Spray: Dmitry Dzhurinskiy1; Roman Maev1; Volf Leshchynsky1; Emil Strumban1; 1University of Windsor

4:10 PM

Cold Spray Process for the Repair and Manufacture of Aluminium Alloy Parts: Tiziana Marrocco1; David Harvey1; 1TWI Ltd

4:30 PM

Detection of Corrosion-Related Defects and Copper Enrichment in Aluminum and Aluminium Alloy Using Positron Annihilation Spectroscopy: Yichu Wu1; P.H. Li1; Tongguang Zhai2; Paul Coleman3; 1Wuhan University; 2University of Kentucky; 3 University of Bath

Designing Against Fatigue Keynote

Room: Rangos I • University Student Center 1:15 PM

Keynote: Effect of Fatigue and Damage Tolerance Material Properties on the Efficiency of Aircraft Structures: Hans-Jürgen Schmidt1; Bianka Schmidt-Brandecker1; 1AeroStruc – Aeronautical Engineering

Fatigue and Fracture Toughness 4

Room: Rangos III • University Student Center 2:00 PM

Invited: Damage Tolerance Applied to the Design of Mid-Size Aircraft: Carlos Chaves1; 1Embraer S/A

2:40 PM

The Metallurgy of High Fracture Toughness Aluminum-Based Plate Products for Aircraft Internal Structure: Julien Boselli1; Gary Bray1; Roberto Rioja1; Dirk Mooy1; Gregory Venema1; Gerriet Feyen1; Wei Wang1; 1Alcoa Technical Center

3:00 PM

Break

3:30 PM

The Evolution of Plate and Extruded Products with High Strength and Fracture Toughness: Diana Denzer1; Roberto Rioja1; Gary Bray1; Gregory Venema1; Edward Colvin1; 1Alcoa

3:50 PM

Lighter and Stiffer Materials for Use in Space Vehicles: Roberto Rioja1; Diana Denzer1; Dirk Mooy1; Greg Venema1; 1Alcoa Inc

Forming and Joining 8

Room: Rangos II • University Student Center 2:00 PM

Mechanical Properties of Al-Mg-Sc-Zr Alloys at Cryogenic and Ambient Temperatures: Anna Mogucheva1; Dariya Zhemchuzhnikova1; Rustam Kaibyshev1; 1Belgorod State University

2:20 PM

An Al–Mg–Si-Cu Alloy with Improved Formability Used for Automotive Body Panels: Fuan Guo1; 1CHALCO

2:40 PM

Evolution of Aluminum Can Stock Materials (1961-2011): Robert Sanders1; Eiki Usui2; Takashi Inaba2; 1Sanders Aluminum Consulting LLC; 2Kobe Steel

3:00 PM

Break

3:30 PM

Manufacturing Challenges for Aluminum Sheet in the Automotive Industry: Susan Hartfield-Wunsch1; Jody Hall1; 1General Motors

3:50 PM

New Al-Mg-Si Alloy V-1341 Alloyed with Calcium for the Aviation and Automotive Industries: Gennady Klochkov1; Olga Grushko2; Victor Ovchinnikov3; Valery Popov2; 1FSUE “VIAM”; 2FSUE VIAM; 3RAC MiG

4:10 PM

Thermal Modeling and Die Design Tools for Warm Forming Applications: Nia Harrison1; George Luckey1; 1Ford Motor Company

ICME 2

Room: Dowd • University Student Center A Brief Overview of ICME: Current State and Path Forward: John Allison1; George Spanos2; 1The University of Michigan; 2 TMS

2:40 PM

A Through Process Model for AA3xxx Aluminum Alloys: Warren Poole1; Mary Wells2; Nick Parson3; 1UBC; 2University of Waterloo; 3Rio Tinto Alcan

3:00 PM

Break

3:30 PM

Through Process Simulation of Al-Sheet Production – a Texture-Based and a Texture-Free Approach: Thiemo Brüggemann1; 1Institute of Physical Metallurgy and Metal Physics, RWTH-Aachen University

3:50 PM

Modeling the Recrystallization Textures in Al Alloys after Various Rolling Reductions: Jurij Sidor1; Roumen Petrov1; Leo Kestens1; 1University Gent

4:10 PM

TCAL1 and MOBAL2 - The Development and Validation of New Thermodynamic and Mobility Databases for Aluminium Alloys: Paul Mason1; Andreas Markstrom2; Y Du3; S. Liu3; J. Zhang3; L Kjellqvist2; J Bratberg2; A Engstrom2; Q. Chen2; 1 Thermo-Calc Software Inc.; 2Thermo-Calc Software AB; 3Central South University

4:30 PM

Aluminum is Aluminum, Right?: Chandler Becker1; Ellad Tadmor2; 1NIST; 2Dept. of Aerospace Engineering and Mechanics, University of Minnesota

Phase Transformations 5

Room: Connan • University Student Center 2:00 PM

A Study of Stress Effects on Beta-Phase Precipitation in Al-Mg Alloys Using In-Situ TEM: Daniel Scotto D’Antuono1; Jennifer Gaies2; William Golumbfskie2; Mitra Taheri3; 1Drexel University ; 2Naval Surface Warfare Center; 3Drexel University

2:20 PM

Ageing Hardening and Precipitation of the 7A60 Alloys during Cooling Aging: Liu Yan1; 1Harbin Institute of Technology

2:40 PM

Precipitation Morphology in Al-Mg-Si-Sc-Zr Hot-Rolled Sheet: Ken-ichi Ikeda1; Ryutaro Akiyoshi1; Takuya Takashita1; Masatoshi Mitsuhara1; Satoshi Hata1; Hideharu Nakashima1; Kazuhiro Yamada1; Kenji Kaneko1; 1Kyushu University

13th International Conference on Aluminum Alloys

Technical Session Listing

2:00 PM

27

TMP 5

Room: McConomy Auditorium • University Student Center 2:00 PM

Distinguishing Dynamic Recrystallization (DRX) in Aluminum and Single Phase Alloys: Hugh McQueen1; 1Concordia University

2:20 PM

Examining the Mechanisms of Dynamic Recrystallization (DRX) in Two-Phase Al Alloys: Hugh McQueen1; 1Concordia University

2:40 PM

Mechanical Characterization of Bimodal Grain Size Aluminum 5083 under Various Test Conditions: Andrew Magee1; Leila Ladani1; 1The University of Alabama

3:00 PM

Break

3:30 PM

Microstructure and Mechanical Properties of an Al-Mg-Sc-Zr Alloy Subjected to Extensive Cold Rolling: Anna Mogucheva1; Evgeniya Babich1; Rustam Kaibyshev1; 1Belgorod State University

3:50 PM

Microstructure, Mechanical and Electrical Properties Evolution during Cold Rolling of Different 1xxxx Series Aluminium after Continuous Casting: Tadeusz Knych1; Artur Kawecki1; Grzegorz Kiesiewicz1; Pawel Kwasniewski1; Andrzej Mamala1; Beata Smyrak1; Wojciech Sciezor1; 1AGH - University of Science and Technology

4:10 PM

Modeling of Work-Hardening in an Age-hardenable AA7108 Aluminum Alloy: Ida Westermann1; Odd Sture Hopperstad2; Ole Runar Myhr3; Knut Marthinsen2; Bjørn Holmedal2; 1SINTEF; 2Norwegian University of Science and Technology; 3Hydro Aluminium

4:30 PM

Overageing Kinetics in Fibrous vs Recrystallised Al-Mg-Si-Cu Alloys: Jostein Røyset1; Jon Holmestad1; Calin Marioara2; Hydro Aluminium Research and Technology Development; 2SINTEF Materials and Chemistry

1

TMP Keynote

Room: McConomy Auditorium • University Student Center 1:15 PM

Keynote: Characterization of Metal Flow in Metals Processing by a Combined Approach using Advanced Experimental Grid Pattern Techniques Coupled with FE-analysis: Henry Valberg1; 1The Norwegian University of Science and Technology (NTNU)

TMP 7

Technical Session Listing

Room: Wright • University Student Center

28

2:00 PM

Effect of Si and Mn Additions on Solid Solution Hardening of Aluminum Alloys: Qinglong Zhao1; Bjørn Holmedal1; 1Norwegian University of Science and Technology

2:20 PM

Effect of the Process of Hot Deformation of Aluminum Alloy with the Addition of Zirconium on the Formation of its Electrical and Mechanical Properties during the Process of Heat-treatment: Marzena Piwowarska1; Piotr Uliasz1; Tadeusz Knych1; 1AGH University of Science and Technology

2:40 PM

Effects of Deformation Texture Intensities and Precipitates on the Anisotropy of Mechanical Properties of Al-Li Alloy 2099 T83 Extrusions: Alexandre Bois-Brochu1; Carl Blais1; Franck Armel Tchitembo Goma1; Daniel Larouche1; Julien Boselli2; Mathieu Brochu3; 1Laval University; 2Alcoa; 3McGill University

3:00 PM

Break

3:30 PM

Evolution in Microchemistry and its Effect on Deformation and Annealing Behavior of an AlMnFeSi-Alloy: Ning Wang1; Jarl Flatøy1; Yanjun Li2; Knut Marthinsen1; 1Norwegian University of Science and Technology; 2SINTEF Materials and Chemistry

3:50 PM

Formation of P ({011}<566>) and {113}<110> Textures by Precipitation Pinning in Continuous Cast Al Alloys during Annealing: Tongguang Zhai1; Qiang Zeng2; Wei Wen1; Xiyu Wen3; 1University of Kentucky; 2Central Iron and Steel Research Institute; 3Center for Aluminum

4:10 PM

Industrial Development of Al-Cu-Mg-Li-Ag Alloy V-1469: Yulia Klochkova1; Olga Grushko1; Vladimir Shamray2; Gennady Klochkov1; 1FSUE VIAM; 2IMET RAS

4:30 PM

Influence of Process Fluctuations on Weld Seam Properties in Aluminum Alloy Extrusion: Marcus Engelhardt1; Norbert Grittner1; Christian Klose1; Friedrich-Wilhelm Bach1; 1Leibniz Universität Hannover

4:50 PM

The Effect of 3D Networks Formed by Ni, Cu and Fe Aluminides on the Strength of Multicomponent Al-Si Piston Alloys: Zahid Asghar1; Guillermo Requena1; 1TUWien

Thursday AM Casting & Solidification 6

Room: Rangos I • University Student Center 9:15 AM

Single Roll Caster to Cast Aluminum Alloy Strip: Toshio Haga1; Shinji Kumai2; Hisaki Watari3; 1Osaka Institute of Technology; 2Tokyo Institute of Technology; 3Gunma University

9:35 AM

Microstructure of 3003/4045 Aluminum Alloy Clad Strip Fabricated by Vertical Type Tandem Twin Roll Caster: Ryoji Nakamura1; Toshio Haga2; Yohei Harada1; Shinji Kumai1; 1Tokyo Institute of Technology; 2Osaka Institute of Technology

9:55 AM

Break

10:25 AM

Roll Caster to Cast Clad Strip: Toshio Haga1; Shinji Kumai2; Hisaki Watari3; 1Osaka Institute of Technology; 2Tokyo Institute of Technology; 3Gunma University

10:45 AM

Tests of Heat Treatment Conditions of AlZr0.22 Alloy Produced using the Continuous Casting Method: Marzena Piwowarska1; Tadeusz Knych1; Piotr Uliasz1; 1University of Science and Technology (AGH) in Cracow

11:05 AM 11:25 AM

Investigation on the Evolution of the Microstructure during Homogenization in Thin Al Sheets: Ildiko Peter1; Mario Rosso1; Politecnico di Torino

1

Manufacturing Technology of Aluminium Alloy Products Intended for Use in Transport by Land, Sea and Air: Tomasz Stuczynski1; 1Institute of Non Ferrous Metals

Casting & Solidification 8

Room: Rangos III • University Student Center 9:15 AM

SEM Study on Short Time Oxide Films in Molten Pure Aluminium: Behzad Nayebi1; Mehdi Divandari1; 1Iran University of Science and Technology (IUST)

9:35 AM

Effects of Electroslag Refining on Removal of Iron Impurity and Alumina Inclusions from Aluminum: Jun Wang1; Chong Chen1; Baode Sun1; 1Shanghai Jiaotong University

9:55 AM

Break

10:25 AM

The Effects of Extra Si and Heat Treatment on the Microstructure and Tensile Properties of Al-15%Mg2Si In-Situ Composite: Alireza Hajaghasi1; Masoud Emamy2; Amin Bahrami3; 1Department of Engineering, Saveh Branch, Islamic Azad University; 2School of Metallurgy and Materials, University of Tehran; 3Imam Khomeini International University

10:45 AM

The Influence of Cu on Eutectic Nucleation and Morphology in Hypoeutectic Al-Si Alloys: Anilajaram Darlapudi1; Milan Felberbaum1; Arne Dahle1; Mathiesen R.H2; 1University of Queensland; 2Department of Physics, NTNU

11:05 AM

Aging Behavior of Flexcast® Al-Mg Alloys with Sc and Zr Additions: Mojan Sohi1; Nitin Singh2; Chad Sinclair1; Warren Poole1; Mark Gallerneault2; 1University of British Columbia; 2Novelis Inc.

11:25 AM

Primary Cooling Heat Transfer during the Direct-Chill Casting of Aluminum Alloy AA6111: Etienne Caron1; Amir Baserinia1; Rosa Pelayo1; David Weckman1; Mary Wells1; 1University of Waterloo

Corrosion Keynote

Room: Rangos I • University Student Center 8:15 AM

Keynote: Application of Microelectrochemical Methods for Understanding Localized Corrosion Behavior of Aluminum Alloys: Rudolph Buchheit1; 1Ohio State University

Room: McKenna/Peter • University Student Center 9:15 AM

Corrosion Characteristics of Sintered 7075 Aluminum Alloy under SSRT Test: Satoshi Sunada1; Kengo Kimura1; Yoshizou Ishizima2; Tomoyuki Kohida3; Norio Nunomura1; Kazuhiko Majima1; 1University of Toyama; 2Hitachi Chemical Co., Ltd.; 3 Hitachi Powdered Metals Co., Ltd.

9:35 AM

Effect of Aging Tempers on Electrochemical and Stress Corrosion Cracking Behavior of a 7017 Al-Zn-Mg Alloy: Prasanta Rout1; M M Ghosh1; K S Ghosh1; 1National Institute of Technology (NIT) Durgapur

9:55 AM

Break

10:25 AM

Corrosion Fatigue Mechanism on Hot-Forged AA6082 Aluminum Alloy: Noormohammed Saleema1; Pascal Gauthier1; X. Grant Chen1; 1University of Quebec at Chicoutimi

10:45 AM

Corrosion Inhibition of Stress Corrosion Cracking and Localized Corrosion of Turbo-Expander Materials: Bezad Bavarian1; Jia Zhang1; Lisa Reiner1; 1CSUN

13th International Conference on Aluminum Alloys

Technical Session Listing

Corrosion 3

29

11:05 AM

Corrosion Characteristics of an Al-1.78%Si-13.29%Mg Alloy in Chloride Solutions: Maximo Pech-Canul1; Rajiv Giridharagopal2; Martin Pech-Canul3; Euler Coral-Escobar4; 1Cinvestav-Merida; 2University of Washington; 3Cinvestav-Saltillo; 4 Universidad del Atlántico

11:25 AM

Cathodic Dissolution of Pure Aluminum, Aluminum Alloy AA6061 and Aluminum Particle Based Coating Studied by AESEC Method: Maria Serdechnova1; Polina Volovitch1; Kevin Ogle1; 1ENSCP, LPCS

Forming and Joining 9

Room: Rangos II • University Student Center 9:15 AM

Buckling of Aluminium Sheet Components: Vishwanath Hegadekatte1; Yihai Shi1; Dubravko Nardini2; 1Novelis Inc.; 2Oxford Engineering Solutions Ltd

9:35 AM

Predicting Hot Deformation of AA5182 Sheet: John Lee1; Alexander Carpenter1; Jakub Jodlowski1; Eric Taleff1; 1The University of Texas at Austin

9:55 AM

Break

10:25 AM

Electromagnetic Hemming for Aluminum Alloy Sheets: Jianhui Shang1; Steve Hatkevich1; Larry Wilkerson1; 1American Trim LLC

10:45 AM

Examination of Buckling Behavior of Thin-Walled Al-Mg-Si Alloy Extrusions: Athanasios Vazdirvanidis1; Ioanna Koumarioti2; George Pantazopoulos3; Andreas Rikos3; Anagnostis Toulfatzis3; Protesilaos Kostazos4; Dimitrios Manolakos4; 1ELKEME ; 2 ETEM SA; 3ELKEME; 4National Technical University of Athens

11:05 AM

Cancelled: Fracture Anisotropy of Al-Mg-Si Alloy Sheets during Bending in T4P Temper State: Aleksandar Davidkov1; Roumen Petrov1; Peter De Smet2; Leo Kestens1; 1UGent; 2Aleris Aluminium Duffel B.V.B.A.

11:25 AM

Crystal Plasticity Calculations of Mechanical Anisotropy of Aluminium Compared to Experiments and to Yield Criterion Fittings: Kai Zhang1; Bjørn Holmedal1; Tomas Manik1; Qinglong Zhao1; 1Norwegian University of Science and Technology

ICME 3 Room: Dowd • University Student Center 9:15 AM

Invited: Advances in Aluminium ICME: Juergen Hirsch1; 1Hydro Aluminium Rolled Products GmbH

9:55 AM

Break Numerical Simulation of Flat Rolling Practices: Yihai Shi1; Peidong Wu2; Mark Gallerneault3; 1Novelis Global Technology; McMaster University; 3Novelis Global Technology

10:25 AM

2

10:45 AM

Modelling the Effect of Room Temperature Storage and Deformation on the Age-Hardening Behavior of Al-Mg-Si Alloys: Carmen Schäfer1; Ole Runar Myhr2; Zeqin Liang3; Henk-Jan Brinkman1; Olaf Engler1; Jürgen Hirsch1; Cynthia Chang4; John Banhart3; 1Hydro Aluminium Rolled Products GmbH; 2Hydro Aluminium, Research and Technology Development; 3 Helmholtz Zentrum Berlin für Materialien und Energie; 4Technische Universität Berlin

11:05 AM

Application of Computational Thermodynamics and Precipitation Kinetics to Light Weight Al Alloy Design: Danielle Belsito1; Victor Champagne2; Richard Sisson1; 1Worcester Polytechnic Institute; 2US Army Research Laboratory

11:25 AM

The Application of ICME in Aluminium Castings Simulation: Sam Scott1; J. Guo2; 1ESI North America; 2ESI US R&D

Recycling Keynote

Technical Session Listing

Room: McConomy Auditorium • University Student Center

30

8:15 AM

Keynote: Aluminum Recovery and Recycling for the 21st Century: Challenges and Opportunities: Diran Apelian1; Worcester Polytechnic Institute

1

Recycling 1

Room: Wright • University Student Center 9:15 AM

Exploring Property Based Aluminum Specifications: Naitik Gada1; Gabrielle Gaustad1; 1Rochester Institute of Technology

9:35 AM

Comparison of the Influence of Si and Fe in High Purity Aluminum and in Commercial Purity Aluminum: Qinglong Zhao1; Marius Slagsvold1; Bjørn Holmedal1; 1Norwegian University of Science and Technology

9:55 AM

Break

10:25 AM

6xxx Series Alloy Design Considerations Relating to Recycling: Malcolm Couper1; 1ARC Centre of Excellence for Design in Light Metals, Monash University

10:45 AM

Emerging Development in Al-Alloy Recycling For Nontraditional Aluminum Metal Matrix Composites Processing: Bakr Rabeeh1; 1German University in Egypt

11:05 AM

Reuse of Al Dross as an Engineered Product: Chen Dai1; Diran Apelian1; 1WPI

11:25 AM

Separation of Inclusion Particles from Liquid Metal by Electromagnetic Force: Shin-ichi Shimasaki1; Koichi Takahashi2; Yoshimasa Kanno2; Shoji Taniguchi1; 1Tohoku University; 2Tohoku University, now Furukawa-Sky Aluminum Corp.

TMP 10

Room: Connan • University Student Center 9:15 AM

Advances in Aluminum Mold Block for Plastic Injection Molding Operations: Jinsoo Kim1; Ron Smierciak2; Yong Seung Shin3; Leighton Cooper3; 1Alcoa Technical Center; 2Alcoa Forgings & Extrusions; 3Samsung Electronics

9:35 AM

Analysis of Dimensional Distortion in 5XXX Alloys during Annealing for Flat Panel Display Applications: Xiaoxiao Ma1; Department of Electrical and Computer Engineering, Lehigh University

9:55 AM

Break

10:25 AM

Effect of Exploitation Overhead Power Lines on the Evolution of Mechanical Properties of Wires: Andrzej Nowak1; Piotr Uliasz1; Tadeusz Knych1; Andrzej Mamala1; 1AGH University of Science and Technology

10:45 AM

Metalworking of a Spherical Particle Reinforced Aluminum Composite: William Harrigan1; 1Gamma Technology

11:05 AM

Properties, Microstructure and Hot Deformation Behavior of Different Al-Zn-Mg (Zr) Alloys: Paola Leo1; McQueen Hugh2; Emanuela Cerri1; Stefano Spigarelli3; 1Università del Salento; 2Concordia University; 3Università Politecnica delle Marche

11:25 AM

Super High Strength Aluminum Alloy Processed by Ball Milling and Hot Extrusion: Ruixiao Zheng1; Han Yang1; Zengjie Wang1; Shizhen Wen1; Tong Liu1; Chaoli Ma1; 1Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University

11:45 AM

Tailored Welding Technique for High Strength Al-Cu Alloy for Higher Mechanical Properties: Nagendrappa Biradar1; Ramling Raman1; 1Indian Institute of Technology, Bombay

TMP 8

Room: McConomy Auditorium • University Student Center 9:15 AM

Development of Age-Hardening Technology for Ultrafine-Grained Al-Li-Cu Alloys Fabricated by High-Pressure Torsion: Hiroaki Motoshima1; Shoichi Hirosawa1; Seungwon Lee2; Zenji Horita2; Kenji Matsuda3; Daisuke Terada4; 1Yokohama National University; 2University of Kyushu; 3Toyama University; 4Kyoto University

9:35 AM

Evolution of Fragmented Fe-intermetallic Compounds in the Semi-Solid State of Al-Mg-Si-Fe Alloys by Deformation SemiSolid Forming Process: Chakkrist Phongphisutthinan1; Hiroyasu Tezuka1; Equo Kobayashi1; Tatsuo Sato1; 1Tokyo Institute of Technology

9:55 AM

Break

10:25 AM

Hierarchy-Strengthening in Al-Mg Alloys: Peter Liddicoat1; Maxim Murashkin2; Xiaozhou Liao1; Ruslan Valiev2; Simon Ringer1; 1The University of Sydney; 2Ufa State Aviation Technical University

10:45 AM

Identification and Distribution of Fe Intermetallic Phases in AA5657 DC Cast Ingots: Zhan Zhang1; Gaofeng Li1; X.-G. Chen1; 1University of Quebec at Chicoutimi

11:05 AM

Microstructure and Mechanical Properties of AA2195 DC Cast Ingot Plates: E.M. Elgallad1; A. Hekmat-Ardakan2; F. Ajersch3; X-G. Chen1; 1University of Québec at Chicoutimi; 2Université de Sherbrooke; 3École Plotechnique de Montréal

11:25 AM

Residual Stresses in Thick Aluminum Impeller Forgings Measured by Neutron Diffraction: Julia Repper1; Nicolas Chobaut2; Patrick Schloth2; Vadim Davydov1; Peter Sälzle3; Jean-Marie Drezet2; Helena Van Swygenhoven1; 1Paul Scherrer Institut; 2 Ecole Polytechnique Fédérale de Lausanne; 3ABB Turbo Systems AG

Technical Session Listing

13th International Conference on Aluminum Alloys

31

Thursday PM Casting & Solidification 7

Room: Rangos I • University Student Center 1:15 PM

Investigation of Acoustic Streaming in Aluminum Melts Exposed to High-Intensity Ultrasonic Irradiation: Sergey Komarov1; Yasuo Ishiwata1; Yoshihiro Takeda1; 1Nippon Light Metal Co.,Ltd.

1:35 PM

Fabrication of Aluminum Alloy-Based Diamond Grinding Wheel by the Centrifugal Mixed-Powder Method for Novel Machining Technology of CFRP: Takahiro Kunimine1; Motoko Yamada1; Hisashi Sato1; Yoshimi Watanabe1; 1Nagoya Institute of Technology

1:55 PM

Rapid Solidification of a New Generation Aluminum-Lithium Alloy via Electrospark Deposition: David Heard1; Julien Boselli2; Raynald Gauvin1; Mathieu Brochu1; 1McGill University; 2ALCOA

2:15 PM

Preparation of Al-Sc Master Alloy by Aluminothermic Reaction with Special Molten Salt: Cong Xu1; Xinxin Liu1; Fengmei Ma1; Zhiwei Wang1; Wenhong Wang2; Chaoli Ma1; 1Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University; 2Hebei Sitong New Metal Material Co., Ltd.

2:35 PM

In situ Synthesis of Al/TiC Composites by Combustion Reaction in an Al Melt: Young-Hee Cho1; Jung-Moo Lee1; Hwa-Jung Kim1; Jong-Jin Kim1; Su-Hyeon Kim1; 1Korea Institute of Materials Science, KIMS

Corrosion 4

Room: McKenna/Peter • University Student Center 1:15 PM

Corrosion Performance of New Generation Aluminum-Lithium Alloys for Aerospace Applications: James Moran1; Francine Bovard1; James Chrzan1; Peter Vandenburgh1; 1Alcoa

1:35 PM

Galvanic Corrosion of Al-Li Alloys Coupled to CFRP Composite: Wenping Zhang1; James Moran1; Raphael Morales1; Peter Vandenburgh1; 1Alcoa Technical Center

1:55 PM

Comparison of Corrosion Performance and Mechanisms of Al-Cu Alloys with and without Li Addition: Christine Henon1; Sacha Rouault1; 1Constellium CRV

2:15 PM

The Effect of Stress in Age-forming on Corrosion Behavior of High-strength Aluminum Alloy: Junfeng Chen1; Gerald Frankel2; Chengyan Xu1; Guoai Li3; Zheng Lu3; Liang Zhen1; 1Harbin Institute of Technology; 2Ohio State University; 3Beijing Institute of Aeronautical Materials

2:35 PM

Corrosion and Potentiostatic Polarization of an Al-Cu-Li Alloy under Tensile Stress: Jin-feng Li1; Zi-qiao Zheng1; 1Central South University

ICME 4

Technical Session Listing

Room: Dowd • University Student Center

32

1:15 PM

Evaluation of the Quenching Sensitivity of Al-Zn-Mg-Cu-Zr Aluminum Alloys by Mole Fraction of Equilibrium Phases: Nie Baohua1; Liu Peiying2; Zhou Tietao2; Xie Yanjun2; 1BeiHang University; 2BeiHang University

1:35 PM

Modelling Grain Deformation during Extrusion of AA3003 using the Finite Element Method: Yahya Mahmoodkhani1; Mary Wells1; Lina Grajales2; Warren Poole2; Nick Parson3; 1University of Waterloo; 2University of British Columbia; 3Rio Tinto Alcan

1:55 PM

Experience of Developing and Introduction in Industry New Primary and Secondary Al-Alloys with Given Properties for Shape Casting: Vadim Zolotorevskiy1; 1National University of Science and Technology “MISiS”

Recycling 2

Room: Wright • University Student Center 1:15 PM

The Influence of Pyrolythic Reactions on the the Aluminium Dross Formation during the Twin Chamber Remelting Process: Benjamin Jaroni1; Benedikt Flerus1; Georg Rombach2; Bernd Friedrich1; 1RWTH, IME; 2Hydro Aluminium Deutschland GmbH

1:35 PM

Peripheral Friction Stir Processing for Recycling Aluminium Scrap: Fadi Abu-Farha1; 1Penn State Erie

1:55 PM

Turbulent Coagulation of Solid Particles in Molten Aluminum–Kinetics of Cluster Formation: Tao LI1; Shin-ichi Shimasaki1; Shoji Taniguchi1; Kentaro Uesugi2; 1Tohoku University; 2Japan Synchrotron Radiation Research Institute (JASRI)/ SPring8

2:15 PM

Purification Using High Pressure Molten Aluminum: Vivek Sample1; William Cassada1; 1Alcoa Technical Center

2:35 PM

Recycling of Aluminum Alloy with DIMOX and Rheocasting Functionalize High Performance Structural Foam Composite: Bakr Rabeeh1; 1German University in Egypt

TMP 9

Room: McConomy Auditorium • University Student Center 1:15 PM

A Study of the Microstructure, Crystallographic Texture, and Recrystallization in AA4006 Alloy Strips Produced by Twin Roll Caster and Direct Chill Processes: Ricardo Fernandes1; Fabricio Souza2; Angelo Padilha2; Ronald Plaut2; Nelson Lima3; 1 Votorantim Metais - CBA; 2Universidade de São Paulo; 3Instituto de Pesquisas Energéticas e Nucleares

1:35 PM

Effect of Extensive Rolling on Mechanical Properties of an A-Mg-Sc Alloy: Anna Mogucheva1; Andrey Dubyna1; Rustam Kaibyshev1; 1Belgorod State University

1:55 PM

Microstructure and Texture Evolution of Al-Zn-Mg Aluminum Alloy during Cold Rolled to High Strain and Followed Annealing: Zhiqing Zhang1; Dandan Chen1; Qing Liu1; 1Chongqing University

2:15 PM

Strategy for Enhancing Mechanical Properties of Age-Hardenable Aluminum Alloys by ECAP: Rustam Kaibyshev1; Anna Mogucheva1; Marat Gazizov1; 1Belgorod State University

2:35 PM

Cancelled: Texture and Earing Properties of Induction Annealed Continuous Cast 3xxx Aluminum Alloy: Yansheng Liu1; Xiyu Wen2; Shridas Ningileri2; 1SECAT Inc; 2University of Kentucky

2:55 PM

Threshold Deformation for Exhibiting the Hardening on Annealing Behavior in AA3103 Alloy: Nagaraj Govindaraj1; Bjørn Holmedal1; 1NTNU

Technical Session Listing

13th International Conference on Aluminum Alloys

33

Poster Session

Room: Wiegand Gym • University Student Center P01 - Change of Dislocation Density in Ultrafine-Grained Aluminum during Tensile Deformation: Hiroki Adachi1; Yoji Miyajima2; Nobuhiro Tsuji3; 1University of Hyogo; 2Tokyo Institute of Technology; 3Kyoto University P03 - Electromagnetic Continuous Casting of Free-Shape Aluminum Billet: Myoung-Gyun Kim1; Joon-Pyo Park1; Jong-Ho Kim1; GyuChang Lee1; 1Research Institute of Industrial Science and Technology(RIST) P04 - Microstructure and Mechanical Properties of Al-Mn/Al-Si Hybrid Aluminum Alloys Prepared by Duo-Casting: SungJin Park1; JongHo Kim2; JunPyo Park2; SiYoung Chang1; 1Korea Aerospace University; 2RIST P05 - Influences of Pouring Temperature and Cooling Rate on Microstructure and Microhardness of Casting ADC12 Alloy: Xiaowu Hu1; 1 Nanchang University P06 - Effect of Mn on the Interaction between Die Casting Steel and Al Alloy: Se-Weon Choi1; Young-Chan Kim1; Cheol-Woo Kim1; JaeIk Cho1; Chang-Seog Kang1; Yu-Mi Kim2; Sung-Kil Hong2; 1KITECH; 2Chonnam National University P07 - Limitation of Shrinkage Porosity in Aluminum Rotor Die Casting: Young-Chan Kim1; Se-Weon Choi1; Cheol-Woo Kim1; Jae-Ik Cho1; Sung-Ho Lee1; Chang-Seog Kang1; 1KITECH P08 - The Effect of Alloying Elements on Thermal Conductivity and Casting Characteristic in High Pressure Die Casting of Aluminum Alloy: Cheol Woo Kim1; Jae Ik Cho1; Se Weon Choi1; Young Chan Kim1; Chang Seog Kang1; 1KITECH P09 - Aluminum Clad Ingot Casting by Electromagnetic Stirring Technique: Jong Ho Kim1; Young-Joon Lee1; Seong Ho Seok1; Joon Pyo Park1; 1RIST P10 - An Overview of Molten Aluminium Steam Explosions: Alex Lowery1; 1WISE CHEM LLC P11 - Organic Coatings to Prevent Molten Aluminum Water Explosions in Aluminum Cast Houses: Alex Lowery1; 1WISE CHEM LLC P12 - Experimental Study of Direct Squeeze Casting of Al-Si Alloy: Slim Souissi1; Mohamed Ben Amar1; Chedly Bradai1; 1ENIS-Sfax P13 - An Investigation on the Refinement Effect of Ti-6Al-4V on Fe-rich Hypo-eutectic Al-Si Alloys: Tara Foroozan1; A. Maniee1; Reza Taghiabadi1; 1International University of Imam Khomeini P14 - The Relationship between Dendrite Arm Spacing and Cooling Rate of Al-Si Casting Alloys in High Pressure Die Casting: Jae-Ik Cho1; Cheol-Woo Kim1; Young-Chan Kim1; Se-Weon Choi1; Chang-Seog Kang1; 1Korea Institute of Industrial Technology P15 - Development and Characterization of an Al –Grid Metasurface on Conformal Geometry: Ildiko Peter1; Ladislau Matekovits1; 1 Politecnico di Torino P16 - The Effect of Chemical Composition and Structure on the Corrosion Resistance of Plated Aluminium Alloy Strips: Andrzej Klyszewski1; Janusz Zelechowski1; Mieczyslaw Opyrchal1; Marek Nowak1; Andrzej Frontczak2; Pawel Rutecki2; 1Institute of NonFerrous Metals; 2IMPEXMETAL SA, Huta Aluminium Konin P17 - Research on the Fatigue and Crack Initiation Behavior of Alloy 7449: Zi-qiao Zheng1; Shen Zhong1; Shi-chen Li1; Jin-feng Li1; Central South University

1

P18 - Effects of Long Term Thermal Exposures on Degradation of Mechanical Properties in 5456-H116 and 5083-H116: Mohsen Seifi1; Justin Brosi1; John Lewandowski1; 1Case Western Reserve University

Technical Session Listing

P19 - Effect of Staged Heat Treatment on Properties of Al-li Alloys: Dmitriy Ryabov1; Vladislav Antipov1; Nikolay Kolobnev1; Larisa Khokhlatova1; 1FSUE All-Russian Scientific Research Institute of Aviation Materials

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P20 - Microstructure and Mechanical Properties of an Electron Beam Welds in a Spray-Deposited Al-Zn-Mg-Cu Alloy: Feng Wang1; Yuting Zuo1; Baiqing Xiong1; Yongan Zhang1; Zhihui Li1; Hongwei Liu1; Xiwu Li1; 1Grinm P21 - Characterization of Damage Mechanisms during Bending of 6xxx Aluminium Automotive Sheets: Laurent Mattei1; Dominique Daniel2; Gilles Guiglionda3; Helmut Klocker1; 1Ecole Nationale Supérieure des Mines de Saint-Etienne; 2Constellium CRV; 3Constellium P22 - Heat Treatment of Welded Joints Made on 7020 Alloy with the AlMg5 Alloy: Wojciech Szymanski1; Marzena Lech-Grega2; Sonia Boczkal2; Andrzej Klyszewski2; 1Institute of Non-Ferrous Metals ; 2Institute of Non-Ferrous Metals P23 - The Behavior of the Cordon of Weld of an Alloy of Aluminum 7075 T6 Welded by the TIG Process: Mustapha Temmar1; Mohamed Khatir1; 1University of Blida P24 - Age-hardening Behavior of MgB2 Particle Dispersed Al Alloy Composite Materials: Chihaya Kawamoto1; Kenji Matsuda1; Satoshi Murakami1; Daisuke Tokai1; Tokimasa Kawabata1; Yasuhiro Uetani2; Susumu Ikeno3; 1University of Toyama; 2Toyama Prefectural College; 3Hokuriku Polytechnic College P25 - Production of the Al3Ti Foam by Microwave Heating: Tsuyoshi Yamamoto1; Makoto Kobashi1; Naoyuki Kanetake1; 1Nagoya University P26 - Effects of Microalloying with Sn on the Precipitation Process of Al-3.5Cu-0.4Mg(wt%) Alloy: Jun Shu1; Zhiguo Chen1; Jishuai Zhang1; 1Central South University

P27 - Precipitation Processes in Al-Cu-Mg-(Si) Alloys in the a+S+T Phase Field: Zhiguo Chen1; Jun Shu1; Gang Sha2; Junhai Xia2; Shiyong Wang1; Simon Ringer2; 1Central South University; 2The University of Sydney P28 - Effect of Fe Content on the Transformation of Ferrous Phases in 6XXX Alloys during Homogenizing Annealing: Pavel Bryantsev1; Marina Samoshina1; 1National University of Science and Technology “MISiS” P29 - Evolution of Nanometer Precipitates in Al-Zn-Mg-Cu Alloy Subjected to Overaging Treatment and Warm Deformation: Yujing Lang1; Hua Cui1; Yuanhua Cai1; Jishan Zhang1; 1USTB P30 - Precipitation Morphology and Tensile Properties of Al-0.62Mg-0.32Si Alloy Aged at Low Temperature: Ryutaro Akiyoshi1; Ken-ichi Ikeda1; Masatoshi Mitsuhara1; Satoshi Hata1; Hideharu Nakashima1; Ken Takata2; Makoto Saga2; Kohsaku Ushioda2; Kenji Kaneko1; Masao Kikuchi1; 1Kyushu University, Japan; 2Nippon Steel Corporation, Japan P31 - Microstructural Change and Mechanical Properties with Isochronal Aging in Al-Ni-Gd Metallic Glasses: Hideomi KATO1; Shoichi Hirosawa1; Kenji Matsuda2; Gary Shiflet3; 1Yokohama National University; 2Toyama University; 3University of Virginia P32 - Age-Hardening Behavior of Al-Mg2Si Alloys with Different Mn or Fe Contents: Shumei Wang1; Shanshan Chen1; Tokimasa Kawabata1; Susumu Ikeno2; Hidetoshi Takagi3; Koji Kawakita3; Kenji Matsuda1; 1University of Toyama; 2Hokuriku Polytechnic College; 3 SankyoMaterials Inc P33 - The Features of Phase Composition and Microstructure of Eutectic Piston Silumins AlSi12CuMgNi and AlSi12Cu2MgNi: Marina Samoshina1; Nikolay Belov1; 1National University of Science and Technology “MISiS” P34 - TEM Observation of Precipitates in Ag-Added Al-Mg-Si Alloys: Takeshi Nagai1; Kenji Matsuda1; Tokimasa Kawabata1; Susumu Ikeno2; 1University of Toyama; 2Hokuriku Polytechnic College P35 - Effect of Ag and Cu Contents on the Age Hardening Behavior of Al-Zn-Mg Alloys: Katsumi Watanabe1; Tokimasa Kawabata1; Susumu Ikeno2; Tomoo Yoshida3; Satoshi Murakami3; Kenji Matsuda1; 1University of Toyama; 2Hokuriku Polytechnic College; 3Aisin Keikinzoku Co., LTD. P36 - Effect of Cu or Ag Addition on Tensile Deformation in Al-Zn-Mg Alloys: Naoya Miura1; Katsumi Watanabe1; Tokimasa Kawabata1; Yasuhiro Uetani2; Susumu Ikeno3; Tomoo Yoshida4; Satoshi Murakami4; Kenji Matsuda1; 1University of Toyama; 2Toyama Prefectural University; 3Hokuriku Polytechnic College; 4Aisin Keikinzoku Co., LTD. P37 - HRTEM Observation of Precipitation in Cu and Ag Added Al-Mg-Si Alloys: Momoko Tokuda1; Kenji Matsuda1; Takeshi Nagai1; Tokimasa Kawabata1; Junya Nakamura2; Susumu Ikeno3; 1University of Toyama; 2University of Tohoku; 3Hokuriku Polytechnic College P38 - Effect of Cu or Ag Addition on Two-step Aging Al-Mg-Si Alloy: Yoshihisa Oe1; Kenji Matsuda1; Momoko Tokuda1; Takeshi Nagai1; Tokimasa Kawabata1; Susumu Ikeno; Susumu Ikeno2; 1University of Toyama; 2Hokuriku Polytechnique College P39 - Effect of Cold-Rolling on Age Hardening in Excess Mg-type Al-Mg-Si Alloys Including Some Minor Elements: Yurie Ogawa1; Kenji Matsuda1; Tokimasa Kawabata1; Yasuhiro Uetani2; Susumu Ikeno3; 1University of Toyama; 2Toyama Prefectural College; 3 Hokuriku Polytechnique College P40 - Effect of Transition Metals on The Age-hardening Behavior of Al-Mg-Ge Alloys: Keisuke Matsuura1; Kenji Matsuda1; Tomoatsu Murakami1; Tokimasa Kawabata1; Yasuhiro Uetani2; Susumu Ikeno3; 1University of Toyama; 2Toyama Prefectural University; 3Hokuriku Polytechnic College P41 - Influence of 0.4Fe and 0.25%Si on the Formation of the GPB Zones in the Al-3%Cu-1%Mg Alloy: Kadi-Hanifi Mouhyddine1; Raho Azzeddine1; Chaieb Zoubir1; Ould Mohammed Ouarda1; 1University USTHB P42 - TEM Observation of Precipitates in Al-Mg-Ge Alloys with Different Mg2Ge Contents: Tomoatsu Murakami1; Kenji Matsuda1; Tokimasa Kawabata1; Susumu Ikeno2; 1University of Toyama; 2Hokuriku Polytechnic College

P44 - X-ray Diffraction Study on Lattice Constant of Supersaturated Solid Solution for Al Based Binary Alloys and Selected Al-ZnMg-Cu Alloys: Zhihui Li1; Xiong Baiqing1; Zhang Yongan1; Li Xiwu1; Zhu Baohong1; Liu Hongwei1; Wang Feng1; Li Peiyue1; 1General Research Institute for Non-ferrous Metals P45 - Influence of Ti, B and Sr on the Tribological Properties of Forged A356 Alloy: Dayanand Mallapur1; K. Rajendra Udupa2; Shivaputrappa Kori3; Rajashekhar Kurahatti1; 1Basaveshwar Engineering College; 2National Institute of Technology Karnataka; 3 Visvesvaraya Technological University P46 - A Conventional Thermo-Mechanical Process for Improving the Mechanical Properties of Al-Cu-Mg Alloy: Zhiguo Chen1; Jieke Ren1; Yujin Huang1; Jishuai Zhang1; 1Central South University P47 - The Phase Morphological Change of 7000 Series Aluminium Alloy Added Ni: Peng Gao1; Tietao Zhou1; 1Beihang University P48 - Effect of Alloy Elements on Microstructures and Mechanical Properties in Al-Mg-Si Alloy: Yoshikazu Katoh1; Koji Hisayuki1; Masashi Sakaguchi1; Kenji Higashi2; 1Showa Denko K.K.; 2Osaka Prefecture University P49 - Deformation Behavior of Semi-Solid A356 Alloys during Compression at Elevated Temperature and its Thixo-Extrusion: DaeHwan Kim1; Guen-Ho Van1; Hee-Kyung Kim1; Su-Gun Lim1; 1, Gyeongsang National University, i-Cube Center, Engineering Research Institute

13th International Conference on Aluminum Alloys

Technical Session Listing

P43 - Influence of Silicon Addition on Precipitation Behavior in an Al-Cu-Mg Alloy: Xiwu Li1; Baiqing Xiong1; Yongan Zhang1; Feng Wang1; Yanqi Zeng1; Zhihui Li1; Baohong Zhu1; Hongwei Liu1; 1General Research Institute for Nonferrous Metals

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P50 - A Study on Thermal-Conducting, Mechanical and Surface-Treating Characteristics of Al-Zn-Mg Alloys: Je Sik Shin1; Sangmok Lee1; Kitae Kim1; Sehyun Ko1; 1Korea Institute of Industrial Technology P51 - The Influence of Grain Structure on the Ductile Fracture Mode of Extrusion Weld Seams: Andrew Den Bakker1; Laurens Katgerman2; 1Other; 2TU Delft P52 - Dispersion Hardening Effect of Dispersoids in 3xxx Al Alloys With Varying Manganese and Silicon Contents: Eva Mørtsell1; Astrid Marie Muggerud1; Yanjun Li2; Randi Holmestad1; 1NTNU; 2Sintef P53 - Effect of Hot Extrusion Conditions on the Microstructure of AA3003: Lina Grajales1; Warren Poole1; Yahya Mahmoodkhani2; Mary Wells2; Nick Parson3; 1University of British Columbia; 2Univeristy of Waterloo; 3Arvida Research and Development Centre P54 - Effect of Iron and Silicon on Strength and Electrical Resistivity of Al-Zr Wire Alloys: Alexander Alabin1; Nikolay Belov1; 1MISIS P55 - Effect of Prior State on the Microstructural Evolution in a Al-Cu-Mg-Ag Alloy during ECAP at 250°C: Marat Gazizov1; Rustam Kaibyshev1; 1Belgorod State University P56 - Influence of the Chemical Composition on the Structure and Properties of Lead-Free Machinable AA6023 (Al-Mg-Si-Sn-Bi) Alloy: Jiri Faltus1; Miroslav Karlik2; Petr Haušild2; 1Research Institute for Metals; 2Czech Technical University in Prague P57 - Effect of Thermomechanical Treatment on Sag Resistance of Roll-Bonded High Strength Aluminum Clad Sheets: Kwangjun Euh1; Hyoung-Wook Kim1; Suk Bong Kang1; 1Korea Institute of Materials Science P58 - Homogenisation of 6xxx Alloy Ingots with an Addition of Vanadium: Marzena Lech-Grega1; Wojciech Szymanski1; Mariusz Bigaj1; Maciej Gawlik1; 1Institute of Non-Ferrous Metals P59 - An Effect of Thermomechanical Treatment on Properties and Structure of Al-Cu- Li-Zn Alloy Plates: Michail Oglodkov1; 1FSUE All-Russian Scientific Research Institute of Aviation Materials P60 - Effect of Subsequent Annealing on the Microstructure Stability of Friction Stir Processed AA5052 Alloy: Peter Kalu1; M. AdamsHughes2; 1FAMU-FSU College of Engineering; 2Formerly of FAMU-FSU College of Engineering, now at Proctor & Gamble P61 - The Mould Characteristics of Ngwo Foundry Sand: Emmanuel Nwonye1; Basil Okorie2; 1Scientific Equipment Development Institute; 2Enugu state University of Science and Technology, Enugu P62 - Effect of State on the Mould Characteristics of Ngwo Foundry Sand: Emmanuel Nwonye1; Jeorom Odo2; 1Scientific Equipment Development Institute; 2Nnadi Zikiwe University, Awka P63 - Effect of Quenching Condition on Aging of Dilute Al-Ag Alloy: Teruto Kanadani1; Keiyu Nakagawa; Akira Sakakibara2; Koji Murakami3; Makoto Hino; 1Okayama University of Science; 2Okayama University; 3Industrial Technology Research Institute of Okayama Prefecture

Technical Session Listing

P64 - The Evolution of Homogeneity on Transverse Cross-section of an Al Alloy Deformed by Twist Extrusion: Shahab Ranjbar Bahadori1; S. A. Asghar Akbari Mousavi1; 1University of Tehran

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TECHNICAL PROGRAM WITH ABSTRACTS

MONDAY AM

Plenary Session

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Monday AM June 4, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: William Cassada, Alcoa Technical Center

Casting & Solidification 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc. Monday PM June 4, 2012

Room: Rangos I Location: University Student Center

Session Chair: Ralf Napolitano, Iowa State University

Technical Program

1:20 PM Study on DC Casting Process of Three-Layer Composite Ingots of 4045/3004/4045 Aluminum Alloys: Jianzhong Cui1; Haitao Zhang1; Huixue Jiang1; 1Northeastern University In this study, experiments are combined with numerical simulation to study the temperature field and flow field during the casting process of 4045/3004/4045 three-layer composite ingots with section of 500mm×420mm. The effects of distribution manner, casting temperature, casting speed, contacting height and cooling intensity of cooling plate on the casting process were discussed. The macro-morphologies and microstructures of the composite ingots, the temperature distribution and the element distribution in the interface zone were investigated, also the interface bonding strength was measured. The optimal parameters for casting composite ingots were obtained. Results show that the solid supporting layer formed on the cooling plates plays a key role in the casting process of composite ingots. The solid supporting layer can prevent the blending of two melts by resisting the impact of alloy melt, which ensures the stable casting process and casting high quality composite ingots.

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1:40 PM Study on Electromagnet-Air Knife DC Casting Process of Large-Size AA 7055 Aluminum Alloys: Haitao Zhang1; Hiromi Nagaumi1; Jianzhong Cui1; 1Northeastern University It is well known that the large-size AA 7055 aluminum alloys ingots is produced difficultly because of a variety of casting defects such as crack, macrosegregation and shrinkage porosity etc. In this paper, Low frequency electromagnetic field and air knife are applied simultaneously to produce large-size AA 7055 aluminum alloy ingots during DC casting. Moreover, the effects of low frequency electromagnetic field and air knife on the macro-physical fields (flow field, temperature field and stress-strain field) during the semi-continuous casting process of aluminum alloys and the microstructure and crack in the billets are studied and analyzed in detail by the numerical and experimental methods. Comparison of the calculated results for macro-physical fields indicate that applying electromagnetic field can modify the direction of melt flow, increase the velocity of melt flow and homogenize the distribution of temperature in the sump, and applying air knife can homogenize the distribution of temperature and decrease the stress and strain in the solidificated ingots. Further, the microstructure of the billet is refined remarkably and the crack in the ingots is eliminated by applying electromagnetic field and air knife during DC casting because of modification of the macro-physical fields.

2:00 PM Aluminum Monolithic Alloy and Multi-Alloy Cast Using Planar Solidification Approach: Men Chu1; Alvaro Giron1; William Cassada1; 1 Alcoa Technical Center Direct-Chill (DC) casting of aluminum ingots and billets for the subsequent manufacture of wrought product forms has been the established industry standard practice for the past 80 years. The through-thickness characteristics of aluminum products are well understood and are affected by the phenomena of macrosegregation which occurs during casting. In the present work, two new classes of alloy ingot were cast using a novel planar solidification approach. One class is a monolithic alloy ingot with a highly uniform composition through the thickness. The other class is multi-alloy ingot with engineered compositional gradients through the thickness. The chemical and microstructural characteristics of these cast materials are discussed and compared to conventional DC ingot. 2:20 PM The Effect of Planar Solidification on Mechanical Properties of Al-ZnMg-Cu-Zr Alloy Plate: Tim Hosch1; M. G. Chu1; G. Feyen1; R. Rioja1; W. Cassada1; 1Alcoa Direct-Chill (DC) casting of aluminum ingots and billets for the subsequent manufacture of wrought product forms has been the established industry standard practice for the past 80 years. The throughthickness characteristics of aluminum products are well understood and are affected by the chemical variability introduced during DC casting by the phenomenon known as macrosegregation. In the present work, an ingot of Al-Zn-Cu-Mg-Zr was cast using a novel planar solidification approach that avoids conventional DC macrosegregation and achieves a highly uniform composition through-thickness. This ingot was fabricated to 25 mm plate and its chemical, microstructural, and mechanical characteristics are compared to a DC cast and fabricated plate of similar composition, thickness, and temper. 2:40 PM Functional Gradient Products Enabled by Planar Solidification Technologies: Roberto Rioja1; Ralph Sawtell1; Men-Glenn Chu1; Mike Karabin1; William Cassada1; 1Alcoa Inc A new class of materials with engineered compositional gradients through the thickness is introduced. Ingots with different types of composition gradients through the thickness were fabricated into plate. The composition and mechanical properties of these “Functional Gradient” plate products are described, and the energy absorption performance of different architectures of functional gradient products is discussed in terms of dimensionless parameters. It is concluded that ab-initio simulations of architecture and performance are needed for the development and use of functional gradient products. 3:00 PM Break 3:20 PM Development of Large-size Ultrasonic Sonotrodes for Cavitation Treatment of Molten Metals: Sergey Komarov1; Yasuo Ishiwata1; 1 Nippon Light Metal Co.,Ltd. This work presents results of the development of large-size highamplitude ceramic sonotrodes destined for use in cavitation treatment of molten metals. The sonotrodes were characterized for their vibration amplitude, erosion resistance and cavitation-producing ability in aluminum melts. The ability of the sonotrodes to refine the grain structure was examined by applying them to the DC casting of Al-Si hypereutectic alloys. The results showed that the sonotrodes have excellent performance characteristics, and they possess far superior erosion resistance and endurance than those made of such high-resistance refractory metals as Nb alloys.

following upon the addition of 0.04% Ti. A significant deterioration in impact properties is observed due to the Sr-B interaction in some cases. The improvements in toughness may be attributed primarily to the change in silicon particle morphology and to the dissolution and fragmentation of a number of the intermetallics formed during the T6 temper.

4:00 PM Role of Solute and Transition Metals in Grain Refinement of Aluminum Alloys under Ultrasonic Melt Treatment: Liang Zhang1; Dmitry Eskin2; Alexis Miroux3; Laurens Katgerman1; 1Delft University of Technology; 2 Brunel University; 3Materials Innovation Institute It is well known that several factors affect the as-cast microstructure through influencing either nucleation or growth during solidification. The effect of solute elements on grain refinement, which can be quantified by the growth restriction parameter Q, is of great importance for controlling the as-cast grain size in aluminum alloy. In addition, our previous results show that ultrasonic melt treatment results in a dramatical grain refining effect in an aluminum alloy when transition metals, such as Ti and Zr, are present in the melt. In this paper, the effect of solute elements and of the intermetallics formed by the transition metals in combination with ultrasonic treatment is studied. The results show that the presence of transition metals in combination with a large growth restriction parameter facilitates the grain refinement under ultrasonic melt treatment. The upscaling of this effect to direct-chill casting is also discussed.

Session Chair: Luis Fanor Vega, Alcoa, Inc.

4:20 PM Melt Conditioned Casting of Aluminum Alloys: Geoff Scamans1; Zhongyun Fan1; Hu-Tian Li1; 1BCAST High shear melt conditioning of aluminum alloy melts disperses oxide films and provides potent nuclei to promote non-dendritic solidification leading to refined as cast microstructures for both shape castings and semi or continuously cast product forms. A new generation of high shear melt conditioning equipment has been developed based on a dispersive mixer that can condition either a batch melt or can provide a continuous melt feed. Most significantly the melt conditioner can be used directly in the sump of a DC caster where it has a dramatic effect on the cast microstructure. The present goals are to expand the castable alloy range and to increase the tolerance of alloys used in transport applications to impurities to increase the use of recycled metal. The paper will review the current status of the melt conditioning technology across the range of casting options and will highlight development opportunities.

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Rudi Buchheit, Ohio State University; Jim Moran, Alcoa Inc. Monday PM June 4, 2012

Room: McKenna/Peter Location: University Student Center

1:20 PM Invited Measurements of Adhesion and Adhesion Degradation for Organic Coatings on Metals: Gerald Frankel1; B.C. Rincon Troconis1; J. Seong1; K.N. Win1; 1Ohio State University The protectiveness provided by organic coatings to metal substrates depends to a large extent on the adhesion of the coating to the metal. Common measures of adhesion, such as the dolly pull off test and the cross hatch test have issues with reproducibility and interpretation. Furthermore, wet adhesion, which is representative of real degradation, is difficult to assess. This talk will describe several quantitative approaches for assessing adhesion and adhesion degradation. The blister test, in which a coating spanning a through-hole in the substrate is delaminated by pressurized fluid, was used to assess the effects of pretreatment on coating adhesion. AFM scratching is a way to scratch a surface with a controlled force. It has been used in the past to disrupt a passive metal surface in situ and investigate the environmental conditions under which repassivation or continued attack will occur. 2:00 PM Analysis of Dimensional Distortion in 5XXX Alloys during Annealing for Organic Electronics Applications: Xiaoxiao Ma1; Miltiadis Hatalis1; Wojciech Misiolek1; Kirit Shah2; Thomas Levendusky2; 1Department of Electrical and Computer Engineering, Lehigh University; 2Alcoa Technical Center Dimensional distortion during thermal cycles has been a concern for 5XXX Aluminum alloys when they are used as substrates for flexible organic electronics. Irreversible dimensional distortion of Aluminum alloys that accompany heat treatment would greatly influence the performance and yield of devices fabricated on them. In this study, 200µm thick cold rolled 5XXX series Al alloy foils aluminum substrates were are investigated for feasibility of fabricating thin film transistors for Organic Light Emitting (OLED) displays . Photolithographic methods, combineding with patterning and etching of alignment marks on the surface, were are used to evaluate the dimensional stability of Al alloy these substrates in thermal cycles with various temperatures and heat-treatment times. 300ºC Aannealing for one 1 hour @ 300°C may generate dimensional distortion of more than 50 ppm.

13th International Conference on Aluminum Alloys

Technical Program

4:40 PM Impact Toughness Enhancement of Melt Treated Al-Si-Mg Cast Alloy: Adel Mohamed1; F.H Samuel1; Saleh Alkahtani2; 1UQAC; 2Salman Bin Abdulaziz University The alloy toughness is influenced by the alloy composition and the melt treatments applied. The present work investigates the effects of different types of grain refiners on the impact properties of Sr-modified A356.2 alloys in as-cast and heated-treated conditions. The results show that the addition of Ti and B greatly improves the alloy toughness but only in a fully modified state, and the right type of master alloy and addition levels are used. The highest values for total absorbed energy of T6-tempered alloys are obtained after using Al-5%Ti-1%B and Al-10%Ti master alloys

Coatings

MONDAY PM

3:40 PM Microstructural Evolution in Intensive Melt Sheared Direct-Chill Cast Aluminium Alloys: Simon Jones1; A. Prasada Rao1; 1BCAST It has been demonstrated by our research group that Intensive Melt Shearing (IMS) has a significant effect on the refinement of the microstructure of as-cast Mg and Al alloys. However, the work reported to date is rather limited to simple gravity and die-casting. The work presented here in, introduces the IMS to pilot-scale direct-chill (DC) casting process. It has been found that IMS can successfully be adapted to DC cast aluminium alloys. The results obtained in the present work on 80mm billets cast at speeds of 200mm/min, reveal that IMS-DC casting refines the microstructure and affects segregation in DC cast aluminium alloys substantially. In this paper, we discuss the experimental results and propose a possible mechanism of microstructural evolution in IMS-DC cast Al alloys.

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MONDAY PM

2:20 PM Initial Studies of 6082 Aluminium Thin Films: Jon Holmestad1; Øystein Dahl2; Sigmund Andersen2; Oddvin Reiso3; Randi Holmestad4; John Walmsley2; 1NTNU / Hydro Aluminium; 2SINTEF; 3Hydro Aluminium; 4 NTNU The microstructure of thin aluminium 6082 films, with a thickness from 0.1 \956m to 1.6 \956m, has been investigated. The films were deposited by sputtering on Si <100> substrates. The resulting microstructure was studied using Scanning Electron Microscopy and Transmission Electron Microscopy. The grains grew columnarly and depending on the growth conditions, the diameter variedfrom 30 to 100 nm. Heat treatment at 773 K for 4 h was performed as an attempt to increase the grain size, but no subsequent grain growth was observed, indicating that the grain boundaries are stable. After deposition, several different ageing temperatures ranging from 423K to 573K and varying ageing times from 0.5 h to 10 h were performed. No precipitation was observed in the films, which could be due to the small grain size which is in the order of the precipitation free zone. 2:40 PM High Dense RF-DC Plasma Nitriding of Al-Cu Alloys: Tatsuhiko Aizawa1; Yoshio Sugita2; 1Shibaura Institute of Technology; 2YSElectronics, Co. ltd. Aluminum alloys have been used as structural components with aid of surface treatment. Although the conventional anodizing plays a role, there are many limitations in practice; i.e. insufficient wear toughness, low thermal conductivity and so forth. Our group has been concerned with plasma nitriding various kinds of aluminum alloys. In the present paper, Al-Cu based alloys in the class of A2012 and A2014 are employed to make high dense RF-DC plasma nitriding. Being different form the conventional RF or DC plasma nitriding, wide range of plasma ignition conditions are controlled to select the optimum processing step for low temperature nitriding. XRD and XPS analyses are utilized together with SEM and TEM to characterize the microstructure of plasma nitrided materials. Hardness and tribological testing is also used to describe their mechanical properties. Their applications to automotive parts and heat sink units are discussed on the above basic data. 3:00 PM Break

Technical Program

3:20 PM Cancelled Production of Nanostructured Coatings and Composite Layers on Aluminum Surface: Sergey Romankov1; Sergey Komarov2; 1Chonbuk National University; 2Nippon Light Metal Co. Ltd

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3:40 PM Corrosion Resistance Improvement by Alodine EC2 Coating on Aluminum Alloys: Jianhui Shang1; Steve Hatkevich1; Larry Wilkerson1; 1 American Trim LLC A new coating has been developed by Henkel Corporation for aluminum that could greatly increase the corrosion and wear resistance. This coating, called Alodine EC2, is electrodeposited from the electrical assisted hydrolysis of metal complexes, and provides superior resistance for harsh and demanding applications such as marine and high temperature engine environments against corrosion and wear. This paper will present the mechanism of Alodine EC2 coating on aluminum alloys, and the experiment results on the corrosion resistance improvement by Alodine EC2 coating. 4:00 PM Finite Element Simulation of Shot Peening: Prediction of Residual Stresses and Surface Roughness: Alexandre Gariepy1; Claude Perron1; Philippe Bocher2; Martin Lévesque1; 1École Polytechnique de Montréal; 2 École de Technologie Supérieure Shot peening is a surface treatment that consists of bombarding a ductile surface with numerous small and hard particles. Each impact

creates localized plastic strains that permanently stretch the surface. Since the underlying material constrains this stretching, compressive residual stresses are generated near the surface. This process is commonly used in the automotive and aerospace industries to improve fatigue life. Finite element analyses can be used to predict residual stress profiles and surface roughness created by shot peening. This study investigates further the parameters and capabilities of a random impact model by evaluating the representative volume element and the calculated stress distribution. Using an isotropic-kinematic hardening constitutive law to describe the behaviour of AA2024-T351 aluminium alloy, promising results were achieved in terms of residual stresses.

Forming and Joining 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Monday PM June 4, 2012

Room: Rangos II Location: University Student Center

Session Chair: Jeong Whan Yoon, Swinburne University 1:20 PM Correlation of Fracture Behavior with Microstructure in Friction Stir Welded, and Spin-formed Al-Li 2195 Domes: Wesley Tayon1; Marcia Domack1; Stephen Hales1; 1NASA Langley Research Center Single-piece, spun formed domes manufactured from friction stir welded (FSW) plates of Al-Li alloy 2195 can significantly reduce the mass and cost of cryogenic tanks. In this study, the microstructure and texture transformations in the thermo-mechanically affected zone (TMAZ) are correlated with fracture behavior in the vicinity of the weld nugget. The texture transformation in the TMAZ is caused primarily by shear deformation during the FSW process. Variations are correlated with manufacturing parameters and linked with deformation, recrystallization, and shear texture components. Grain morphology and microtexture characteristics were examined in relation to spatial proximity to the weldment/parent metal interface. A strong correlation between fracture location and texture banding was observed. Fracture appears to follow a distinct region of low Taylor factor grains linked with texture bands. Modification of processing parameters to reduce the degree of heterogeneity in texture should lower the probability of fracture within TMAZ regions. 1:40 PM Effect of Process Parameters on Microstructure Stability of FSW Butt Joints after Thermal Treatments: Emanuela Cerri1; Paola Leo1; 1 University of Salento Friction Stir Welding process introduces a degree of deformation in the material that is related to process parameters. Rotational and transversal speeds directly regulate the heat input of welding process and then the morphology and microstructure characteristics. In the present work, mechanical properties and microstructure stability of FSW 6082T6 butt joints were investigated after exposure to high temperature. The thermal stability of fine recrystallized grains in the nugget zone depends on process parameters and post-welding heat treatment and it has unusual consequences on mechanical properties. Infact, ductility of the FSW joints increases with no decrease in strengths and hardness profile of the whole joint are homogenised. The effect of aging after cold deformation is also examined in FSW butt joints.

2:20 PM Microstructure and Mechanical Properties of Dissimilar Friction Stir Welds Using AA6061-T6 and AZ31 Plates: Kwang-jin Lee1; Sang-Hyuk Kim1; Hyeon-Taek Son1; Kee-Do Woo2; 1Korea Institute of Industrial Technology; 2Chonbuk National University This study was performed to investigate microstructure and mechanical properties of dissimilar friction stir welds using AA6061-T6 and AZ31 plates. The process parameters were : rotation speed, 500~2000 RPM ; travel speed, 0.5~2 mm/s. Optical microscope(OM), scanning electron microscope(SEM), transmission electron microscope(TEM) were applied to investigate the weld region. Vickers-hardness, tensile test and impact test were carried out to analyze the mechanical properties of the joint. Tensile strengths of AA6061-T6 and AZ31 plates were 314MPa and 242MPa, respectively. That of the joint, which was welded at 1200RPM , 1.67mm/s, was 182MPa. It is about 80% of AZ31 tensile strength. During tensile test, fracture was occurred at the weld region. Impact absorption energy of the joint was about 2times compared to that of AZ31 base metal. Crack propagation energy dramatically increased at the weld region. This may be due to stirring of base metals and precipitates.

3:40 PM Cancelled Study on the Quality of Friction Stir Welds Made on a Robot: Yousef Imani1; Michel Guillot1; 1Laval University 4:00 PM The Effect of the Variation of Microstructure in the Friction Stir Welded Zone on the Strain and Tensile Properties of Al2139: Tomoko Sano1; Jian Yu1; Richard Chen1; Chian-Fong Yen1; 1US Army Research Laboratory The friction stir welding process creates three distinct zones; the weld nugget, thermal-mechanically affected zone, and the heat affected zone. These zones have varying microstructure, texture, amounts of plastic deformation and dynamic recrystallization. The elevated local stresses and non-uniform strains under tension are attributed to the inhomogeneity in the weld. The ultimate tensile strength (UTS), yield stress, and elastic modulus were determined by tensile tests of samples in three orthogonal orientations from inside and outside the weld. The samples from inside the weld showed lower UTS and yield strength, but longer elongation than those from outside the weld. Digital image correlation was used to map the strain variations of the samples during the tensile tests. In addition, electron backscattered diffraction was used to determine the grain size and texture variation of the grains in the weld zones. The correlation of the microstructure variation on the tensile properties will be discussed. 4:20 PM The Effect of Welding Parameters and Tool Geometry on Formation of Tunneling Defects during Friction Stir Welding of AA 6061: Mansour Nikfarazari1; Seyed Mohammad Hosseini1; 1Imam Khomeini International University Since there is no melting takes place during friction stir welding, Friction Stir welded joints are free from defects like porosity, hot crack etc. Nevertheless, FSW joints are prone to other defects like pinhole, tunnel defect, piping defect, kissing bond, cracks, etc. due to insufficient and excess heat input in the stir zone. In this study, the effect of welding parameters such as rotational speed, travel speed and plunge depth on the formation of tunnel defect during friction stir welding of AA 6061 aluminum alloy has been investigated. This paper also includes studying the effect of tool pin and shoulder profile as well as shoulder diameter on formation of tunnel defect. Since formation of the defect plays a major role in deciding the joint strength, the effect of aforementioned parameters on mechanical properties of AA 6061 aluminum alloy have been analyzed in details.

3:00 PM Break 3:20 PM Microstructure Evolution of AA5083 during Friction Stir Welding: Jaehyung Cho1; Chang Gil Lee1; 1Korea Institute of Materials Science Mechanical properties and microstructure evolution of AA5083 alloys

13th International Conference on Aluminum Alloys

Technical Program

2:40 PM Microstructure and Mechanical Properties of Friction Stir Welded Aluminum Alloy/Stainless Steel Lap Joints: Tomo Ogura1; Taichi Nishida1; Hidehito Nishida2; Syuhei Yoshikawa2; Takumi Yoshida2; Noriko Omichi2; Mitsuo Fujimoto2; Akio Hirose1; 1Osaka University; 2Kawasaki Heavy Industries, LTD Lap joining of an A3003 alloy plate and a SUS306 plate was successfully performed using friction stir welding. In this FSW process, Al-Fe intermetallic compound layer, which is normally observed at the interface of joints in Al alloy/steel dissimilar metal joints using conventional joining methods, was not recognized. TEM observation showed that nanometerscaled amorphous layer was formed at the interface in the region where center of the pin traced. The specimen for micro-tensile testing was prepared from each region of the interface in one joint. The joint cut from where center of the pin traced fractured at aluminum matrix, showing good bondability of the joint. Moreover, the joint using the grooved SUS plate showed higher strength than the flat one due to the wider bonded region. This lap joining technique was also successfully applied to an A6061-T6 high strength plate and a SUS306 plate.

during friction stir welding were investigated. According to various welding conditions, such as tool rotational speed and transverse rate, microstructural features were studied. Precipitates and grain size were compared. Metal flow and the associated texturing were also examined using SEM/EBSD. The base, thermo-mechanically affected, and stirred zones revealed the different microstructures. Equi-axed grains by dynamic recrystallization were mainly obtained in the stirred zone, and their texturing clearly revealed shear deformation. Hardness variation with position was discussed.

MONDAY PM

2:00 PM Microhardness Profile and Microstructure Characterization in Friction Stir Processing Zone of the Aged and Solid Solution Treated 7075 Aluminum Alloys: Zheng Zhou1; Sheng Chen1; Qing Liu1; 1 Chongqing University In this study significant difference on the micro-hardness profile and the microstructures evolution after friction stir processing of the aged and solution treated state 7075 alloys sheet are observed. A comparsion of results between these two initial microstructures indicate that the solutiontreated state alloy exhibit lesser variation of mechanical property, and the HAZ scale and the range of micro-hardness variation of the aged state are wider than that of the solution-treated state across the transverse cross section. Besides traditional softened bands around the processing zone,an apparent additional softened band is observed at the HAZ of the midplane in the aged state sheet while the traditional softened band around the processing zone is only found in the solution-treated state sheet. The effects of microstructures such as grain size and precipitate behavior on the hardness profile are also investigated.

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4:40 PM Hardening Potential of an Al-Cu-Li Friction Stir Weld: Rosen Ivanov1; Julien Boselli2; Diana Denzer2; Raynald Gauvin1; Mathieu Brochu1; 1 McGill; 2Alcoa Inc. The evolution of the microstructure during friction stir welding of a third generation AA2199 Al-Li alloy has been described and related to the mechanical properties of welds. The coupling of electron microscopy and micro-hardness have helped generate an understanding of the relationship between grain structure, precipitate density and morphology behind the observed changes in mechanical properties during post weld artificial ageing. The ability of welds to recover hardness and strength during post weld heat treatment was linked to the limited formation of large scale precipitates which act as sinks for alloying elements. Welds obtained with high tool rotation speed (within parameters studied) showed ultimate tensile strength levels of about 93% of the base metal, an elongation of 6% at fracture, and hardness values ranging between 120-140 HV in the stir zone, thermo-mechanically affected zone, and heat affected zone upon post weld heat treatment.

Forming and Joining 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Monday PM June 4, 2012

Room: Rangos III Location: University Student Center

Session Chair: Raja Mishra, General Motors

Technical Program

1:20 PM Invited Material Testing and Modeling of Aluminum Alloy Sheet in Support of Forming Simulations: Toshihiko Kuwabara1; Kengo Yoshida2; Daisaku Yanaga1; 1Tokyo University of Agriculture and Technology; 2Yamagata University Improvement of the predictive accuracy of forming simulations, such as finite element analysis (FEA), is crucial to enhance the use of aluminum alloy sheets and tubes in manufacturing metal parts, because it is effective to minimize the time and cost required in designing optimum tool geometry and forming conditions. In order to improve the predictive accuracy of forming simulations, it is necessary to use a material model that is capable of accurately reproducing the deformation behavior of the material [Kuwabara, T., Advances in experiments on metal sheets and tubes in support of constitutive modeling and forming simulations, Int. J. Plasticity 23 (2007) 385-419].

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2:00 PM Limitations of M-K Based Forming Limit Diagram Predictions: Mohsen Mohammadi1; Kaan Inal1; Raja Mishra1; 1University of Waterloo Aluminum alloys, with their high strength to density ratio, are finding increasing applications in automotive industry. In this paper the postnecking behaviour of the aluminum alloy 5754 was studied using a Taylortype crystal plasticity formulation coupled with the Marciniak窶適uczynski (M窶適) analysis. Forming Limit Diagrams (FLDs) were simulated with three different stress-strain curves for the aluminum alloy 5754. The stressstrain curves are almost identical in the pre-necking zone while they present three different post-necking strain hardening rates. The results show that the predicted FLDs strongly depend on the post-necking behaviour of the material. Furthermore, as the strain hardening rates in the post necking region increase, the predicted forming limit strains decrease.

2:20 PM Evaluation of the Ring Compression Test for the Parameter Determination of Extended Friction Models: Dieter Horwatitsch1; Andreas Merstallinger2; Kurt Steinhoff3; 1LKR Leichtmetallkompetenzzentrum Ranshofen GmbH; 2Aerospace and Advanced Composites GmbH; 3Chair of Metal Forming Technology, University of Kassel In the development of optimal forming processes FE-based process simulation is more and more integrated. For these process simulations it is crucial to provide appropriate models and the according parameters of mechanisms relevant for forming processes. Friction between the tool and the workpiece is one of those mechanisms. Based on the basic friction models extended models have been developed to introduce the influence of local contact conditions. It would thus be beneficial if existing friction testing methods could allow the determination of the required parameters. The ring compression test is a commonly used standard friction test. In this work standard and treated samples of a modified ring geometry made of AA1050 are investigated with confocal microscopy after applying the ring compression test supported by FE analysis. The experimental and further theoretical results reveal the limits of applicability of this test on the determination of parameters for extended friction models. 2:40 PM Formability of Al-Mg (5052) Sheet with Ball-Wire Method: Ali Tajouri1; Basher Raddad1; 1University of Tripoli Aluminum alloys have an increasing importance in many industrial applications such as aerospace, automotive. Besides bending, stretch forming& deep drawing, the hole expansion process is of considerable importance. This work focusing on expansion of holes in Al-Mg (5052) aluminum specimen was investigated. Stretching of sheet material was checked using wire-ball method on compression testing machine, then specimens having holes in the middle were prepared to study the hole expansion process. The testing results showed that the diameter of the hole &the ball affected the hole expansion ratio. The limiting expansion ratio (LER) was also affected by these parameters. Incremental loading affected the limiting expansion ratio &the thickness strain at the deformed sheet. Key words: Hole expansion, sheet forming, Limiting expansion ratio, thickness strain. 3:00 PM Break 3:20 PM Accelerated Post-Weld Natural Ageing in Ultrasonic Welding Aluminium 6111-T4 Automotive Sheet: Phil Prangnell1; Yingchun Chen1; 1The University of Manchester Ultrasonic spot welding (USW) is an interesting alternative to resistance spot welding (RSW) for joining aluminium alloys because it uses only 2% of the energy. It has been reported that there is no heat affected zone (HAZ) when USW heat-treatable Al-alloys. However, here it is shown that a HAZ is detectable when USW a 6111 alloy, but it is masked by rapid post-weld natural ageing. The HAZ is caused by dissolution of the solute clusters / GPZs present in the T4 sheet due to the high weld temperatures, which can reach over 500ツーC at the weld interface. A model is used to demonstrate that a large excess vacancy concentration can be generated by the high strainrate dynamic deformation in the USW process and this may accelerate the natural ageing response seen in the weld. The subsequent effect on the post-weld paint bake cycle used in industry is also discussed. 3:40 PM Influence of Forming Conditions to Springback in V-bending Process Using Servo Press: Shinya Abe1; Susumu Takahashi1; 1Nihon University In order to prevent global warming, the application of aluminum alloys and high tensile steel sheets to automotive body parts is increasing. However, it is difficult to obtain accurate dimensions of formed parts. Therefore the technologies of reducing springback for the pants formed by

4:00 PM The Influence of Alloy Composition on the Microstructure, Tensile Ductility and Formability of 6xxx Alloys: Hao Zhong1; Paul Rometsch1; Yuri Estrin1; 1Monash University In the continuing quest for car weight reduction, the 6000 series aluminium alloys are considered among the most promising candidates for automotive body panel materials. They are commonly shipped and formed in the T4 temper while still formable and are subsequently given a paintbake treatment which cures the paint and increases the strength by age hardening. In this work, the influence of composition on the microstructure, tensile ductility and formability has been studied on four different 6xxx alloys designed with systematically varying Si and Mg contents. The materials were solution treated and naturally aged. Mechanical properties of these alloys, including tensile strength, strain hardening and strain rate sensitivity, were examined. Forming limit diagram (FLD) tests were employed to evaluate the formability of the alloys. The tensile ductility and formability of the alloys, which are influenced by the alloy composition, are interpreted in terms of the observed microstructure development during deformation.

Novel Materials 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ernest Chin, Army Research Laboratory; Warren Hunt, The Minerals, Metals & Materials Society Monday PM June 4, 2012

Room: Dowd Location: University Student Center

Session Chair: Ernest Chin, ARL

2:40 PM Fabrication of Nanostructural Aluminum Alloy Powder with Ball Milling Method: Han Yang1; Ruixiao Zheng1; Yanbo Yuan1; Xiaoning Hao1; Dan Wu1; Chaoli Ma1; 1Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University The strength of aluminum alloys can be strongly affected by addition of homogeneous dispersed strengthen particles in nanocrystalline matrix. One method to engineer nanocrystalline materials with strengthen particles is mechanical alloying. The aim of this paper is to fabricate aluminum alloy powder with nanostructure using ball milling method. The commercial AlMg-Cu alloy powder was milled along with a different proportion of Febased alloy powder (produced by argon gas atomization process) under various ball milling conditions (milling time, process control agents and rotation speed). The structure and the thermal stability of the ball milled powder were examined using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). It is revealed that the Al alloy grain size was minish to 26nm with Fe-based alloy homogeneously dispersed in it. Based on the structural observation, the formation behavior of nanostructural in ball milled powder is discussed. 3:00 PM Break 3:20 PM Production of Aluminum-Based Nano-Intermetallics by HighPressure Torsion: Kaveh Edalati1; Zenji Horita1; 1Kyushu University Micro-powders of Al were mixed with certain amounts of Ti and Ni micro-powders and severely deformed by high-pressure torsion (HPT). Following the HPT, the powder mixtures were consolidated and their average grain size is reduced to 11-28 nm. Structural analysis showed that following the HPT process high fractions of binary or ternary intermetallics up to ~100% are produced. The current findings suggest that the HPT processes can be used successfully for production of bulk nanostructured intermetallics at low temperatures.

13th International Conference on Aluminum Alloys

Technical Program

1:20 PM Invited Nanostructured Materials: From the Nanoscale to the Microscale: Enrique J. Lavernia1; 1University of California, Davis Bulk nanostructured Al alloys and composites have matured into a new class of materials that is being considered in a variety of structural applications. More importantly, the nanoscale provides materials scientists with an additional degree of freedom to design microstructures with unusual physical and mechanical attributes. The successful synthesis of large-scale so-called multi-scale materials is of technological and scientific significance. From a technological point of view, it will be feasible to obtain engineering materials that retain the structural and chemical attributes of particles/grains in the nanometer size range. From scientific point of view, multi-scale materials will permit systematic investigations of the physical and mechanical behavior, as well as novel phenomena as related to multiple length scales.

2:20 PM Novel Cold Spray Nanostructured Aluminum: Victor Champagne1; Matthew Trexler; Yongho Sohn; George Kim2; 1US Army Research Lab; 2 Perpetual Technologies, Inc. This paper discusses the introduction of a relatively new materials consolidation process, referred to as â&#x20AC;&#x2DC;Cold Sprayâ&#x20AC;&#x2122;, which has been shown to meet the low-temperature, high velocity criteria for the production of dense, oxide-free metal-base nanostructured materials that may contribute to stronger near net-shape spray nanostructured components and as an enabling repair technology. When spraying nanostructured coatings, there are particular requirements in preserving the microstructure and functionality of the feedstock powder in the final bulk material. This is especially true when depositing temperature sensitive and readily oxidizing materials such as carbides, nitrides, and nanostructered metals. For these materials, the goal is to replace most, if not all, of the thermal energy (i.e., flame temperature) with kinetic energy (i.e., particle velocity) so as to retain the nanostructure without contributing to coating oxidation or porosity. Osmotic consolidation, pressure filtration, and tape casting have been used to produce consolidated nanostructured materials with limited thickness. The low temperature and high kinetic energy associated with the cold spray process allow for the retention of fine/nano grain structure, absence of phase change, capability for thick deposits, and promotion of compressive residual coating stress. These capabilities make the cold spray process an ideal approach to depositing nanostructured metal-base coatings, as well as nanostructured bulk materials. This paper will present data associated with the cold spray development and materials characterization of nanostructured 5083 aluminum.

MONDAY PM

press are strongly demended. It is said that the die holding time at bottom dead center of a servo press slide can affect to springback. In order to clarify the forming mechanisms of the phenomenon, V bending test with servo press was performed. Aluminum alloys sheets are applied as specimen. The location of press was measured by linear scales. It was found that the movement of the slide in slide motion program is different from the actual movement of the slide. It is important to confirm if the slide is located in specified position in the program. In addition to it, the springback angle measurement system with laser displacement measurement apparatus is proposed. Because of without human error, the accuracy of proposed measurement system is better than that from image processing method. The maximum difference of measurement angle between the both systems was 0.5 degrees.

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3:40 PM Magnetism, Structural and Mechanical Behavior of Transitional Bulk Nanostructured Al Alloy: Rajath Hegde1; Surendranathan Orongil1; 1 NITK Surathkal Mechanically alloyed powders synthesized by high energy rate ball milling were consolidated to produce bulk polycrystalline Al 50 at % Fe alloy. Consolidation was achieved by cold compaction and sintering, while annealing was done to obtain an ordered structure. Annealed samples were deformed plastically by a range of compression stresses. Combination of characterization techniques like x-ray diffraction, transmission electron microscope, vibrating sample magnetometer and vicker’s micro hardness were utilised to examine different properties. Annealed sample exhibited ordered and non magnetic phase while deformation induced samples showed simultaneous transition to both disorder and ferromagnetism, the transitional alloy at intermediate state possessed partial disorder and low magnetization. The long range order and lattice expansion contribute to the increase in magnetism at low compression stresses while it is only due to the lattice expansion at higher stresses. The order to disorder transition can be assessed by micro hardness measurement. 4:00 PM Microstructural Characteristics of High Rate Plastic Deformation in Al Trimodal Metal Matrix Composites: Clara Hofmeister1; Yongho Sohn1; Troy Topping2; Mark van den Bergh3; Kyu Cho4; 1University of Central Florida; 2Department of Chemical Engineering and Materials Science; 3DWA Aluminum Composites; 4U.S. Army Research Laboratory, Aberdeen Proving Ground An aluminum trimodal metal matrix composites that consist of nanograined Al5083, B4C particles, and coarse-grained pure aluminum was subjected to a high velocity impact load. Fracture surface and cross-section of the damaged composite were examined via optical and secondary electron microscopy to characterize the microstructural development. Microstructural features of the failed composite varied with distance from the entry of the penetrator which included: limited grain recovery near the entry region and localized melting of the composite further along the impact channel. Deformation of the composite, evidenced via bending of the coarse grains to parallel the impact-load direction, was quantified. These results are discussed with respect to the mechanical properties of the composite and its potential for structural applications.

Phase Transformations 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Gary Shiflet, University of Virginia; Dave Laughlin, Carnegie Mellon University Monday PM June 4, 2012

Room: Connan Location: University Student Center

Technical Program

Session Chair: Gary Shiflet, University of Virginia

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1:20 PM Invited Precipitation and Transformation of Metastable Phase in Al-Mg-Si Alloy: Kenji Matsuda1; 1University of Toyama 6000 series Al-Mg-Si alloys are a much studied and used material for automobiles and aluminum frames in Japan. Following numerous reports about the precipitation sequence in these alloys, it is understood that the transformation of precipitates is complicated. In this talk, the effect of additional elements on the precipitate structure was investigated by HRTEM, SAED technique, and EDS. Particulary, the beta’ phase in alloys Al -1.0 mass% Mg2Si -0.5 mass% Ag (Ag-addition) and Al -1.0 mass% Mg2Si (balance) were observed by energy filtered TEM and HAADF-STEM, in order to determine Ag positions in this phase. Ag was

found within the composition of the beta’-phase, and energy filtered TEM and HAADF-STEM showed that the Ag-containing beta’ phase to have a complicated domain structure with one Ag-containing atomic column per beta’ unit cell. The interfaces of the beta’/Al were enriched with Ag atoms that occupy lattice positions on the Al matrix. 2:00 PM Effects of Microalloying Elements (Cu, Ag) on Nanocluster Formation and Age-Hardening Behavior in Al-Mg-Si Alloys: JaeHwang Kim1; Calin Daniel Marioara2; Randi Holmestad3; Equo Kobayashi1; Tatsuo Sato1; 1Tokyo Institute of Technology; 2SINTEF; 3Norwegian University of Science and Technology (NTNU) Two types of nanoclusters, Cluster (1) and Cluster (2), play a very important role in the age-hardening behavior in Al-Mg-Si alloys. Small amounts of Cu and Ag additions strongly affect the nanocluster formation as well as the age-hardening behavior during multi-step aging. Cu and Ag additions retard the formation of Cluster (1) at the initial stage of natural aging, but enhance the formation of Cluster (1) at the middle or final stage of natural aging. On the other hand, both Cu and Ag atoms accelerate the formation of Cluster (2) and later strengthening phases during aging at 100 and 170°C, respectively. Clustering behavior is well explained through the calculated interaction energy between solute atoms and vacancies derived from first-principle calculations. Furthermore, quantitative transmission electron microscope (TEM) observations of the precipitate sequence determining number density and volume fractions is discussed based on the age-hardening phenomena. 2:20 PM Effect of Low Cu Amounts and Pre-Deformation on the Precipitation in Al-Mg-Si Alloys: Takeshi Saito1; Shinji Muraishi2; Calin Marioara3; Randi Holmestad1; 1Norwegian University of Science and Technology; 2 Tokyo Institute of Technology; 3SINTEF Materials and Chemistry Trace elements and deformation influence the precipitation sequence in Al-Mg-Si alloys. In the context of recycling, effects of small amounts of Cu and pre-deformation on the precipitation were investigated. Al-Mg-Si alloys with 0.01 and 0.1 mass% Cu were studied. The alloys were solution heat treated at 545°C for 5 minutes and quenched. Natural aging was then conducted for 30 minutes. Some conditions were pre-deformed to 10% within 5 minutes after the solution heat treatment, while others were nondeformed. Subsequently, the alloys were aged at 190°C for 10 and 300 minutes. Hardness increased with increasing aging time and with predeformation. Fine precipitates were observed for the alloy with 0.1 mass% of Cu, while coarse ones with 0.01 mass% of Cu. The microstructure differences suggest changes in nucleation and precipitate types, which are studied in details by transmission electron microscopy. 2:40 PM High Resolution Characterization of the Precipitation Behavior of an Al-Zn-Mg-Cu Alloy: Yi-Yun Li1; Libor Kovarik2; Patrick Phillips1; Yung-Fu Hsu3; Wen-Hsiung Wang4; Michael Mills1; 1The Ohio State University; 2Pacific Northwest National Lab; 3National Taipei University of Technology; 4National Taiwan University This work addresses the unresolved issues regarding the structure and precipitation evolution of the metastable particles in an Al-Zn-Mg-Cu alloy using high-angle annular dark field imaging under atomic-resolution level. η’ plates were found to be composed of 7 atomic planes parallel to the {111}Al planes with five inner planes alternatively enriched in Mg and Zn and two outer Zn-rich interfacial planes. The smallest η phase has a minimum 11-planes thick structure. In rare instances, particles less than 7 planes were found indicating a very early preference for 7-layer particle formation. Throughout the aging, the plate thickness appears constant, while the plate radius increases and no particles between 7 and 11 planes were observed. Based on the HAADF contrast, our observations do not support the η’ models previously set forth by other authors. Clear structural similarities between η’ and η were also observed.

3:00 PM Break

3:40 PM Precipitation Process in a High Mg to Cu Ratio Al-Mg-Cu-Ge Alloy: Junhai Xia1; Gang Sha1; Zhiguo Chen2; Simon. P. Ringer1; 1The University of Sydney; 2Central South University Precipitate microstructure evolutions of Al-4.0Mg-1.5Cu with/ without 0.25Ge (wt.%) addition during ageing at 200°C were investigated systematically using transmission electron microscopy and atom probe tomography (APT). The Ge addition was found to have a significant influence on hardening response and precipitate microstructures of the alloy. The ternary alloy at the peak hardness after 20-hour ageing had GPB zones as dominant precipitates. The Ge addition slightly enhanced peak hardness of the alloy aged for 25 hours, and small amount of coarse S-phase and Z-phase (crystal structure: Al12Mg17, I-43m) were observed co-existing with GPB zones. APT analysis revealed that Z-phase contains significant amount of Cu with a stoichiometry of Al12(Mg,Cu)17. During prolonged ageing for the Ge-addition alloy, the growth of Z-phase and S-phase was correlated with the decrease of GPB zones. The effect of Ge additions on the precipitate microstructure formation is correlated with the enhanced hardening responses of these alloys.

4:40 PM Prediction of the Influence of Si Content on the Aging Behavior of AlMg-Si-Cu Alloys by Thermodynamic Modeling: Yanli Ji1; Hao Zhong2; Ping Hu1; Fuan Guo1; Hiromi Nagaumi1; 1Suzhou Nonferrous Metals Research Institute; 2Monash University 6xxx series aluminum alloys for automotive body panels generally contain an excess of Si above that required to form stoichiometric Mg2Si, to enhance the precipitation of ß” phase during the automotive paint cure treatment. However, not all the Si elements in the alloys can participate in the ageing process and a significant amount of Si is expected to be consumed by undissolved particles. In this study, thermodynamic modeling was employed to distinguish Si elements in the different conditions and predict the influence of Si content on the ageing behavior of 5 Al-Mg-Si-Cu alloys. In addition, experiments, including hardness measurements, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) were carried out to verify the predictions.

TMP 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Monday PM June 4, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: Wojciech Misiolek, Lehigh University 1:20 PM Invited Hot Extrusion of Aluminum Chips: A. Tekkaya1; Volkan Güley1; Matthias Haase1; Andreas Jäger1; 1Technical University Dortmund The process of hot extrusion is a promising approach for the direct recycling of aluminum machining chips to aluminum profiles. The presented technology is capable of saving energy, as re-melting of aluminum chips can be avoided. Depending on the deformation route and process parameters, the chip-based aluminum extrudates showed mechanical properties comparable or superior to cast aluminum billets extruded under the same conditions. Metallurgical investigations have shown that the single chips are not completely welded together due to remaining oxide layers on the chip surface. Although this effect is undesired in terms of chip bonding quality, it prevents grain growth, which is advantageous for the mechanical properties of the chip-based extrudates.

4:20 PM Analytical Precipitate Model for AA3XXX Alloy: Emmanuel Hersent1; Jesper Friis2; Bjørn Holmedal1; Yanjun Li2; Knut Marthinsen1; 1NTNU; 2 SINTEF

13th International Conference on Aluminum Alloys

Technical Program

4:00 PM Investigations on the Precipitation in Al-Mg-Si Monocrystalline Model Alloy by Small Angle Neutron Scattering: Cynthia Chang1; Andre Heinemann2; Charles Dewhurst3; Zeqin Liang1; John Banhart1; 1 Helmholtz-Zentrum Berlin für Materialien und Energie; 2HelmholtzZentrum Geesthacht; 3Institut Laue-Langevin The aim of this work is to clarify the difference in anisotropic precipitate growth in an Al-Mg-Si single crystal after artificial ageing (AA) with different natural pre-ageing (NPA) conditions. In one experimental series, in-situ small angle neutron scattering (SANS) experiments were performed at 180oC right after solution heat treatment. In another series, the crystal was naturally aged at room temperature for 1 week before the SANS experiment was carried out. The measurements were performed at D22 of the Institut Laue-Langevin with the single crystal mounted so that the neutron beam was parallel to one of the {001}Al. Anisotropic scattering from the needle-like precipitates growing along {001}Al was observed. A model is developed to obtain the size evolution of the precipitates by relating the neutron intensity and assuming precipitates having rod shape morphology. The size evolution of the precipitates is compared for the sample aged with and without NPA.

MONDAY PM

3:20 PM The Effect of Y on the Microstructure and Properties of Al-Zr Alloy: Haiyan Gao1; Yongzhi Zhang1; Jun Wang1; Baode Sun1; 1Shanghai Jiao Tong University Al-Zr wires with dispersed nano-scale metastable Al3Zr particles are widely used in the long distance power transmission due to high electrical conductivity and sufficient strength after heated up to 300°C. However, the precipitation kinetics of Zr in Al is very slow and long period aging treatment is necessary for the preparation of the wires. The effect of Y on the aging characteristics of Al-Zr alloy were investigated in the paper. AlZr-Y alloys were prepared and Brinell hardness and electrical conductivity of the alloys were measured. Formation, distribution and evolution of Al3Zr precipitates were investigated using SEM, TEM. The results show that the Al-Zr-Y alloy exhibits hardness and conductivity peaks when aging at 500°C for 12h and both the hardness and conductivity of Al-Zr-Y alloy are higher than that of Al-Zr alloy, which indicates that presence of Y may accelerate the precipitation kinetics of Zr in the Al matrix.

Prediction of precipitate evolution in AA3XXX alloy is of importance as precipitation has a major influence on downstream processes. A size distribution model based on classical nucleation and growth theory has been implemented to simulate precipitation kinetics. It has been generalized to handle the two non-stoichiometric phases Al6(Fe,Mn) and Al17(Fe,Mn)4Si2. These two phases has been assumed as ideal solution (Fe and Mn could substitute each other completely) and the aluminium matrix as regular solid solution. This thermodynamic modelling coupled with the classical Zener expression for the precipitate growth rate makes possible to have analytical expressions for interfacial concentrations and avoids the use of any CALPHAD software whose calls are time consuming. The model has been tested on different type of heat treatments and shows ability to reproduce fairly well different aspects of precipitate kinetics, i.e. mean radius, volume fraction and solute content.

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MONDAY PM

2:00 PM 3-Dimensional Microstructure of Al-Al3Ti Alloy Severely Deformed by ECAP: Hisashi Sato1; Takahisa Hishikawa1; Yuuki Makino1; Takahiro Kunimine1; Yoshimi Watanabe1; 1Nagoya Institute of Technology Microstructure of Al-Al3Ti alloy deformed by Equal-Channel-Angular Pressing (ECAP) is 3-dimensionally investigated. Especially, distribution of Al3Ti particles is focused in this study. The Al-Al3Ti alloy has coarse Al3Ti platelet particles in Al matrix. When the Al-Al3Ti alloy is deformed by ECAP under route A, fine Al3Ti platelet particles are observed. These Al3Ti particles are aligned on a shear plane. In addition, the plane normal of the Al3Ti particles is parallel to that of the shear plane. On the other hand, Al-Al3Ti alloy ECAPed under route Bc has groups consisted of fine Al3Ti platelet particles. Moreover, longitudinal sizes of the Al3Ti particle groups are close to those of initial particles in the four-pass-ECAPed specimen. These distribution behaviors of the Al3Ti particle can be explained by plastic flow of Al matrix. Finally, it is concluded that distribution of Al3Ti particle in ECAPed Al-Al3Ti alloy is controlled by plastic deformation of Al matrix.

Technical Program

2:20 PM Abnormal Recrystallization Behavior of High Purity Aluminum Foil: Guangjie Huang1; Jing Zhang1; Yunlei Wang1; Qing Liu1; 1Chongqing University The influence of heating rates on recrystallization behavior of high purity aluminum foils was systematically studied in present paper. The result showed that the average grain size of the recrystallized sample is smaller when experiencing a low heating speed (280°C/h, holding at 180°C for one hour then heating to 500°C) than experiencing a high heating speed (put the sample into the furnace at 500°C), which conflicts with recrystallization behavior of typical metals. It is demonstrated that the variation of heating speeds induces transition of recrystallization types from continuous recrystallization at low heating rate to a discontinuous recrystallization at high heating speed. The recovery before recrystallization and the distribution of impurities are suspected to be closely related with the abnormal recrystallization behavior.The study strongly suggests that the heating speed maybe an effective way to modify the grain size in high purity of aluminum foils. And more detailed research will be done soon.

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2:40 PM Effect of Annealing Condition on Earing and Texture Formation in Cold Rolled AA5182 Aluminum Alloy: Minemitsu Okada1; Seiichi Hirano1; 1Sumitomo Light Metal Industries, LTD The effect of annealing condition on earing and recrystallization texture formation in cold rolled AA5182 aluminum alloy was investigated. The earing of AA5182 aluminum alloy depends strongly on the heating rate. At low heating rate (0.01-1K/s) the ears on drawn cup situated at 45 deg. to the sheet rolling direction. At high heating rate (10K/s) the ears were little. The earing behavior was characterized by the texture components. As the heating rate increases, the intensity of cube component increases where as the intensities of Brass and R components decrease. The transformation kinetics of recrystallization during isothermal annealing was quantified by the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation. The results show that the JMAK exponent for recrystallization was determined to be 2.4 at 553K and around 4 at 573K and 593K. The apparent activation energy for recrystallization was estimated to be 203kJ/mol. 3:00 PM Break 3:20 PM Effect of Quenching Wait Time on Microstructure and Mechanical Properties of As-extruded AA6063 Alloy: Yuna Wu1; Hengcheng Liao1; Jian Yang1; 1Southeast University Effect of quenching wait time after hot extrusion on microstructure and mechanical properties of AA6063 alloy was investigated by optical microscopy observation, tensile and Brinell hardness tests. Results

show that the quenching wait time has an important influence on the microstructure and mechanical properties of AA6063 alloy. During hot extrusion, dynamic recrystallization occurs only in local areas suffered much larger strains, however, only within 10s’ wait time after extrusion, the static recrystallized grains have maturely developed. After subsequent T6 heat treatment, the recrystallized grains of the prompt-quenched sample are more uniform than that of the wait-quenched sample, and mechanical properties of the former are also better than that of the latter. 3:40 PM Hot Deformation Behavior and Microstructural Evolution of Homogenized 7150 Aluminum Alloys Micro-Alloyed with Zr and V: Cangji Shi1; X. Grant Chen1; 1Université du Québec à Chicoutimi Hot deformation behavior of homogenized 7150 aluminum alloys micro-alloyed with 0.12% Zr and 0.11% V was studied by compression tests conducted at various temperatures and strain rates. The microstructural evolution was investigated using an optical microscope and the electron backscattered diffraction technique. The results showed that the peak flow stress of alloy 7150 increased due to the addition of Zr or V. The hot deformation activation energy of the base alloy was determined to be 209.0 kJ/mol, which increased to 244.7 kJ/mol and 248.7 kJ/mol when alloyed with 0.12% Zr and 0.11% V respectively. The softening mechanism of the base alloy was dynamic recovery during hot deformation at low temperatures (300 °C - 400 °C), which transformed to dynamic recrystallization at a high temperature (450 °C) and a low strain rate (0.001 s-1). Adding Zr or V generally displayed a retardation of the dynamic recovery and inhibition of the dynamic recrystallization, and hence resulted in the increase of flow stresses. 4:00 PM Modeling of Texture Evolution during Thermomechanical Processing in AA6xxx: Christian Bollmann1; Günter Gottstein1; 1Institute for Metallurgy and Metal Physics The formability of aluminum sheet is strongly depended on the terminal recrystallization texture. Since all processing steps influence the final recrystallization texture, a Through-Process Modeling (TPM) concept was applied to predict texture changes during thermomechanical processing routes. While the texture evolution during deformation was modeled with the Grain Interaction model, the process of recrystallization was simulated with the Statistical Recrystallization Texture model. The major advantage of TPM is to predict terminal recrystallization textures depending on various material and processing parameters. Moreover, the formation of recrystallization textures can be analyzed with regard to their physical mechanisms. The present study was designed to improve the prediction of texture evolution during thermomechanical processing of 6xxx alloys. For this, the models were evaluated for different material and processing conditions. Furthermore, through-thickness texture gradients were considered to address the recrystallization behavior for inhomogeneous deformation conditions and its effect on the terminal anisotropy of rolled sheet. 4:20 PM Orientation Effects in the Particle Stimulated Nucleation of 1 Recrystallization: Lawrence Ko1; Joao Fonseca1; University of Manchester Second phase particles present in commercial alloys have strong influence on the recrystallization kinetics, microstructure and texture. By varying the alloying composition and material processing, distribution of second phase particles can be controlled so as the grain size and texture, if these mechanism is completely understood. It is known that there is lattice rotation around the particles after deformation, in a so-called particle deformation zone (PDZ), which is important to give randomized texture after recrystallization. Here presents a study of the relationship of orientation of the deformed grains and the orientation present in the

PDZ using EBSD. These are compared to the recrystallized microtexture after annealing. Misorientation gradient are also studied to understand the effect of particles on the matrix after deformation. In some cases the recrystallization grain show significant misorientation from the matrix but there are also PSN recrystallized grains with similar orientation. Possible reasons for this are discussed.

Advanced Analysis Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: David Seidman, Northwestern University; Hasso Weiland, Alcoa Inc. Tuesday AM June 5, 2012

Room: Rangos I Location: University Student Center

Session Chair: Hasso Weiland, Alcoa Technical Center

Tuesday AM June 5, 2012

Room: Wright Location: University Student Center

Session Chair: David Seidman, Northwestern University 9:15 AM Aberration-Corrected STEM Study of Precipitates in an Al-MgSi-Ge-Cu Alloy: Ruben Bjørge1; Sigmund Andersen2; Calin Marioara2; Joanne Etheridge3; Randi Holmestad1; 1Norwegian University of Science and Technology; 2SINTEF Materials and Chemistry; 3Monash University Precipitation in a Mg-rich Al-Mg-Si-Ge-Cu alloy was investigated using aberration-corrected high-angle annular dark-field scanning transmission electron microscopy. The precipitates were needle or lath shaped with the longest dimension parallel to <001>Al. The precipitates had no repeating unit cell when viewed along this direction. However, the precipitate structure in projection consisted of a hexagonal network of mixed Si and Ge columns, with Mg, Al, and Cu columns occupying specific sites in between the network columns. The Cu columns appeared with the same local arrangement of atomic columns as in Al-Mg-Si-Cu precipitates, and the Cu-free regions consisted of structural units with Mg and Al at specific sites. The proposed atomic model is supported by image simulations. 9:35 AM Application of Atom Probe Tomography for New Insights into Advanced Aluminium Alloy Technology: Gang Sha1; Simon Ringer1; 1 The University of Sydney Atom probe tomography (APT) is a unique tool able to unveil both quantitative structural and chemical information of materials in threedimension, and to gain insights into material. In this talk, I present our recent work on application of APT to unveil fundamental science of current 2xxx series Al technology. Solute partitioning and segregation in important commercial Al alloys, including AA2024, and AA2524 during ageing at 170°C, have been characterised systematically. A range of trace elements or impurities, including Si, Zn, V etc, have been found to segregate strongly at grain boundaries of the Al alloys. Si has been found to partition into metastable precipitates during the early-stage precipitation. The presence of Si has a significant influence on precipitation microstructural formation, in particular, the growth of S-phase and GPB zones. This talk will highlight how the 3D information helps to understand nucleation and growth of solute nanostructures in these Al alloys.

13th International Conference on Aluminum Alloys

Technical Program

8:15 AM Keynote Atom-Probe Tomography and the Science of a New Class of Al-Sc Based Alloys: David Seidman1; David Dunand1; 1Northwestern University We have developed and studied from a fundamental scientific pointof-view novel Al-Sc-ME-TM-RE (ME = metal: Li, Mg, Si; TM = transition element: Ti, Y, Zr; RE = rare earth element: La and lanthanides) alloys, which exhibit excellent coarsening- and creep resistance at temperatures upwards of 673 K. We rely crucially on the use of atomprobe tomography (APT), which provides direct space three-dimensional information concerning microstructure and chemical compositions on a subnanometer scale. APT provides the necessary physical quantities to understand and model the high-temperature mechanical properties. Specifically, the following microstructural properties of precipitates are measured: (a) volume fraction; (b) mean radius; (c) number density; (d) size distributions in three-dimensions; and (d) chemical compositions of the matrix and precipitate phases as a function of aging temperature and time. This quantitative information is utilized, for example, in the Mohles code to understand the mechanism(s) of plastic deformation at ambient and elevated temperatures.

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: David Seidman, Northwestern University; Hasso Weiland, Alcoa Inc.

TUESDAY AM

4:40 PM Structural Evolution in Aluminium Alloy AA 6082 during HPT Deformation at Increased Temperature: Jozef Zrnik1; Libor Kraus1; Stephan Scheriau2; Reinhard Pippan2; 1Comtes FHT, Inc.; 2Erich Schmid Institute of Materials Science, AAS Commercial aluminium alloy AA6082 (AlMgSi) of different initial structural condition was deformed using high pressure torsion (HPT) at increased temperature of 150°C. The impact of different strain eef and increased temperature on fine grain structure evolution, its thermal stability and mechanical properties were investigated. The refinement of coarse initial alloy structure, modified by different thermal treatment carried out prior deformation, was investigated using TEM of thin foils, with respect to the effect of different shear strain across the disc and applied hydrostatic pressure of 4 GPa. From each deformed disc, performing N-1, 2, 4 and 6 turns, sub-sized tensile specimens were cut off for tensile test. In addition microhardness was measured across the deformed disc to characterize the deformation homogeneity as an effect of varying shear strain towards the disc center. The torque records versus number of turns (angle of twist) was measured and evaluated as well.

Advanced Analysis 1

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Technical Program

TUESDAY AM

9:55 AM Break

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10:25 AM Diffraction-Amalgamated Grain-Boundary Tracking (DAGT) Technique and Its Application to an Aluminium Alloy: Darren LeClere1; Hiroyuki Toda1; Masakazu Kobayashi1; Takanobu Kamiko1; Yoshio Suzuki2; Akihisa Takeuchi2; Kentaro Uesugi2; 1Toyohashi University of Technology; 2Japan Synchrotron Radiation Research Institute A novel method which provides accurate analysis of individual grains during deformation has been developed by amalgamating X-Ray diffraction (XRD) microscopy with grain boundary tracking (GBT). XRD and GBT are both non-destructive in-situ analysis techniques for characterizing bulk materials, which can be carried close to the point of fracture of metals. DAGT provides accurate information about individual grain orientations from near field XRD analysis, whilst the GBT accesses 1 micron level analysis of grain morphologies in 3-dimensions. XRD employed an X-ray pencil beam to analyze a specimen of Al-3mass%Cu before and after deformation. The morphology of the grains were determined by computer tomography (CT) imaging and liquid metal wetting, after which GBT provided an accurate description of the position and morphology of the grains. The integrated technique, DAGT, identified which diffraction spots were related to which grain, making it possible to describe misorientation between grains. 10:45 AM Effect of Composition and Pre-ageing on the Natural Ageing and Paint-baking Behaviour of Al-Mg-Si Alloys: Paul Rometsch1; Sam Gao1; Malcolm Couper1; 1Monash University Two 6xxx series aluminium alloys were designed to have the same total solute content but very different Mg/Si ratios. An excess Mg alloy (Al-1.2Mg-0.5Si) and an excess Si alloy (Al-0.5Mg-1.2Si) were cast and rolled to 1 mm thick sheet. Both were naturally aged for 30 days and then artificially aged for 0.5 h at 170°C to simulate an automotive body panel paint-baking cycle. In order to improve the paint-bake response, pre-ageing treatments of 20 s at 200°C and 2 h at 100°C were tested and evaluated using atom probe tomography, transmission electron microscopy and hardness testing. The results show that the excess Mg alloy tends to have coarser clusters/precipitates than the excess Si alloy, and that the Mg/ Si ratio of the smaller clusters is closer to the alloy composition than that of the larger clusters and precipitates. Depending on the pre-ageing treatment, both alloys can give good paint-baking responses. 11:05 AM High Resolution Microscopy of Al 2199 Alloy: Raynald Gauvin1; Nicolas Brodusch1; Mathieu Brochu1; Michel Trudeau1; 1McGill University This paper describes what state-of-the-art field-emission scanning electron microscopy can achieve to the micro-characterization of a 2199 aluminum-lithium alloy. Bulk samples observed with a Backscattered Electron detector at an acceleration voltage of 3kV and thin foils investigated by Scanning Transmission Electron Microscopy at 30kV, coupled with X-ray microanalysis, reveals a micro structure which has never been observed so completely and easily by other established techniques. Microanalysis has been performed on all types of precipitates, and, although lithium cannot be analysed with the Energy Dispersive Spectrometer, it is however possible to conclude on their chemical nature. Our results are in good agreement with those reported in the literature but reveal some differences, especially in regard to the T1 precipitates, that should be taken into account to understand the true microstructure of the alloy. Comparison with state-of-the-art field-emission transmission electron microscopy will also be presented. 11:25 AM Nanoscale Precipitation-Strengthened Al-Sc-Ta Alloys: Keith Knipling1; 1 Naval Research Laboratory Conventionally-solidified Al-Sc alloys, strengthened by Al3Sc (L12)

precipitates, exhibit remarkably high coarsening and creep resistance at 300 °C, which can be improved with ternary additions of Zr. Zirconium has a much smaller diffusivity than Sc, resulting in Al3(Sc1-<em>x</ ,Zr<em>x</em>) precipitates that are enveloped in a thin (~1 nm thick) Zrem> rich shell. The slower-diffusing Zr atoms limit coarsening and, since they substitute for Sc in the precipitates, can also reduce the relatively high cost of Sc additions. Like Zr, Ta may also be a beneficial alloying addition to Al-Sc alloys. Tantalum forms an Al3Ta trialuminide and Ta is soluble in Al3Sc. Tantalum is also expected to be a slower diffuser than Zr, offering improved thermal stability than Al-Sc-Zr alloys. This study investigates, using transmission electron microscopy and 3-D atom-probe tomography, the structure and composition of the complex Al3(Sc1-<em>x</em>,Ta<em>x</em>) precipitate formed during aging at 200 to 600 °C. 11:45 AM Towards New Aluminium Alloys through Advances in Atom Probe Microscopy: Leif Viskari1; G. Sha1; S.P. Ringer1; 1The University of Sydney The development of Al alloys has through the years significantly relied on advances in materials characterization techniques to allow deeper understanding of microstructural properties. Today, alloy development has reached a level where many of these properties are no longer discussed on micrometre or even nanometre scale, but rather on atomic scale. Consequently, atom probe microscopy (APM) has received greatly increased attention. APM is a powerful characterization technique with unmatched capability of three dimensional (3D) atomic scale studies of the structure and chemistry of materials. This presentation focusses on our on-going development of APM analysis techniques for studies of Al alloys and also demonstrates why APM has earned a vital position in the development road-maps for new alloys. Key aspects of the enabling science are presented and applied to studies of Al alloys. Methods to study solute hierarchy and nano-scale crystallography are emphasized.

Casting & Solidification Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc. Tuesday AM June 5, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: Men Chu, Alcoa Technical Center 8:30 AM Keynote It’s Not Your Father’s Cast House Any More: Robert Wagstaff1; 1 Novelis Solatens Technology Center To many the Cast House is where scrap metal is transformed into ingots for subsequent processing to sheet or plate, is still perceived as an area where innovation is all but impossible. Given the very fundamental role that the Cast House plays in the overall production of aluminum sheet and plate, there are significant technical, and production challenges that must be overcome to successfully introduce advancements in either cost or quality of the final product. If new concepts are sufficiently reviewed and tested, the Cast House can be a springboard for significant innovation and creativity. This presentation provides a brief review of the current state of the Direct Chill (DC) casting process, which remains the largest process for the production of rolling stock for aluminum sheet and plate, and highlights some recent technical advances in the Cast House, with particular attention to their effect(s) upon the entire production chain.

Casting & Solidification 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc. Tuesday AM June 5, 2012

Room: Rangos I Location: University Student Center

Session Chair: Men Chu, Alcoa Technical Center

9:35 AM The Grain Refinement of 7050 Alloy Using Al-5Ti-1B and Al-3Ti0.15C Grain Refiners: Guo Shijie1; Xue Guanxia1; Ma Ke1; Nagaumi Hiromi1; 1Suzhou Institute of Nonferrous Metal Research The morphologies of particles in commercial Al-3Ti-0.2C and Al5Ti-1B alloy used in the refining experiments were investigated and the grain refining response to 7050 alloy was studied in this paper. The results show that Al-3Ti-0.2C master alloy failed to produce an adequate grain refinement at an equal addition level to that which sufficed with the Al5Ti-1B alloy. With increasing the holding time, settlement phenomena of TiC particles and TiB2 particles in 7050 melt were both investigated and the settling time of the particles did not match with the results calculated by Stoke’s law. Based on the experimental results, the efficiency of grain refinement for 7050 casting using Al-3Ti-0.2C grain refiners seems weaker than those using Al-5Ti-1B grain refiners. 9:55 AM Break

11:25 AM The Good Grain Refining Performance of a New Kind of Al-Ti-C-B Master Alloy: Jinfeng Nie1; Xiaoguang Ma1; Haimin Ding1; Xiangfa Liu1; 1 Shandong University A new kind of Al-Ti-C-B master alloy with a uniform microstructure was prepared using a melt reaction method to overcome the problems associated with borides agglomeration in Al-Ti-B and the obvious fading behavior of Al-Ti-C master alloys in the refining process of a-Al. The grain fining tests were carried on the commercial pure aluminum (99.7 wt. %). It is found that the average grain size of a-Al can be reduced to below 200 µm from about 3500 µm by adding 0.2 wt. % the Al-Ti-C-B master alloy and the refining efficiency does not fade obviously within 60 min. It is considered that the TiCxBy (x+y < 1) and TiB2-mCn (m+n < 2) particles found at the center of a-Al grain are the effective and stable nucleating substrates during solidification, which accounts for the good grain refining performance.

10:45 AM The Effects of Mischmetal (Rare Earth) and Heat Treatment on the Structure and Tensile Properties of a New Super High Strength Alloy: Ali Ataei1; Masoud Emamy2; Alireza Hajaghasi3; Amin Bahrami4; 1 South Tehran Branch, Islamic Azad University, Tehran, Iran; 2School of

13th International Conference on Aluminum Alloys

Technical Program

10:25 AM Intermetallic Phase Formation in TP1 and DC Cast Billet of an AA 6063 Al Alloy: Akash Verma1; Sundaram Kumar1; Patrick Grant1; Keyna O’Reilly1; 1University of Oxford The TP1 grain size assessment process has been widely used for simulating aluminium grain formation in the direct chill (DC) casting process, as it is convenient and economical. However, the effectiveness of this process for the simulation of the formation of intermetallic phases present in Al alloy microstructures has never tested. This paper investigates, the microstructures of Al 6063 (Al-.43%Si-.53%Mg-.19%Fe) alloy solidified using both TP1 and DC casting processes. The as-solidified intermetallic phases are analysed in order to assess the effectiveness of the TP1 process in simulating their formation in the DC casting process. A phase extraction technique is used to allow three dimensional quantitative and qualitative analysis of intermetallic phases using SEM, EDS and XRD characterisation techniques.

11:05 AM Grain Refining Potency of LaB6 on Aluminum Alloy: Pengting Li1; Wenjie Tian1; Dong Wang1; Xiangfa Liu1; 1Shandong University Al–LaB6 alloy was successfully prepared by aluminum melt reaction method in this study. Microstructure analysis of the alloy was carried out by field emission scanning electron microscopy (FESEM), Raman spectroscopy and transmission electron microscopy (TEM). It is found cubic LaB6 particles are highly dispersed in aluminum matrix with a uniform edge length of about 4.5 µm. The grain refining potency of LaB6 on commercial pure aluminum has also been investigated. It shows that LaB6 can act as an effective and stable nucleation substrate for a–Al during the solidification process, due to their crystallographic similarity. The coarse grains of commercial pure aluminum are obviously refined to small equiaxed ones by addition of 0.5% Al–5LaB6 alloy at 720 °C.

TUESDAY AM

9:15 AM Invited Microstructural Modification Mechanisms and Integrated Thermal Management for Local Microstructure Control in Aluminum Castings: Ralph Napolitano1; T. Hosch1; D. Schuler1; 1Iowa State University Mechanisms of the flake-fiber transition in Al-Si alloys are investigated using directional solidification and correlated to mechanical properties. Growth velocity thresholds for various stages of the modification transition are identified and implemented in cast microstructure prediction. Integrated thermal management strategies, using printable molds, local heating/cooling, and integrated heat treatment practices for optimizing local structure and properties, are examined to establish practical limits for controllable microstructural gradients.

Metallurgy and Materials, University of Tehran, Tehran, Iran; 3Department of Engineering, Saveh Branch, Islamic Azad University; 4Imam Khomeini International University This study was undertaken to investigate the simultaneous influence of mischmetal (La-Base) and T6 treatment on the structural characteristics and tensile properties of Al-12Zn-2.5Mg-3Cu aluminum alloy. Thus, different amounts of mischmetal (0.1, 0.5, 1 and 3 wt.%) were added into the molten alloy before solution and aging heat treatment. The microstructural studies of the polished and etched samples by optical microscope indicated that mischmetal addition changes the morphology of alloy. According to the microstructural results, heat treatment also caused a considerable modification on the morphology of alloy. The results of tensile testing also showed a direct relationship between microstructural modification and increment of tensile properties. Finally, fracture surfaces of the alloy were studied with different amounts of mischmetal and its failure mechanism was also investigated.

49

Fatigue and Fracture Toughness 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Krishnan Sankaran, Boeing; HJ Schmidt, AeroStruc Tuesday AM June 5, 2012

Room: Rangos III Location: University Student Center

TUESDAY AM

Session Chair: Krishnan Sankaran, The Boeing Company 9:15 AM About the Challenge in Determing the Cyclic Material Behaviour of Aluminium Alloys for the Numerical Fatigue Analyses: Rainer Wagener1; C. Fischer2; A. Frohm2; H. Kaufmann1; 1Fraunhofer Institute for Structural Durability and System Releability LBF; 2TU Darmstadt, System Reliability and Machine Acoustics SzM For a proper fatigue life accumulation you need the knowledge of the cyclic material behaviour. Due to the expected lifetime different fatigue life accumulation concepts are used. For the Low Cycle Fatigue regime a local strain concept using the cyclic material properties according to the rules of Manson-Coffin-Basquin and Ramberg-Osgood are very popular. For the regimes of High Cycle and Very High Cycle Fatigue modifications of the Basquin’s rule are used. Basically these rules are not developed for aluminium alloys and are limited to a small range of fatigue life. Since the 1970s several ongoing investigations had shown that these rules do not fit the experimental results in a proper way. Due to this reason a new method to describe the strain-SN-curve and new testing facilities for the experimental investigation of the cyclic material behaviour of aluminium alloys for the whole range of fatigue life will be presented. 9:35 AM A Microstructure Based Multi-Site Crack Growth Model: John Brockenbrough1; Hasso Weiland1; Joseph Fridy1; 1Alcoa Technical Center A simple computational method to simulate component failures in engineered structures based on microstructure characteristics has been developed. The computational model deals directly with a set of a large number of cracks and is capable of tracking the simultaneous growth and interaction of cracks including crack-tip shielding, link-up, until final failure. The Multi-Site Crack Growth tool is designed to start from either an initial uncracked state where cracks may nucleate from cracked particles or other microstructural features or from an initial cracked state such as might be expected at a percentage of fatigue life expended. The input can also be a microstructure simulation. The tool is designed based on microstructural origins of fatigue cracks, and the statistical distributions of microstructural parameters. Thus it is possible to extend this framework to corrosion-fatigue. Example simulations of crack nucleation from large second phase particles will be given.

Technical Program

9:55 AM Break

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10:25 AM Short Fatigue Crack Growth Micromechanisms in a Cast Aluminium Piston Alloy: Thomas Mbuya1; Jennifer Crump1; Ian Sinclair1; Katherine Soady1; Rachel Thomson2; Philippa Reed1; 1University of Southampton; 2 Loughborough University The short fatigue crack growth behaviour of a model cast aluminium piston alloy has been investigated. This has been achieved using a combination of fatigue crack replication methods at various intervals during fatigue testing and post-mortem analysis of fracture surfaces and crack profiles. Crack-microstructure interactions have been clearly delineated using a combination of optical microscopy (OM), scanning electron microscopy (SEM) and three dimensional (3D) X-ray microtomography (SRCT). Results show that intermetallic particles play a significant role in determining the crack path and growth rate of short fatigue cracks.

It is observed that the growth of short cracks is often retarded or even arrested at intermetallic particles and grain boundaries. Crack deflection at intermetallics and grain boundariesis also frequently observed. These results have been compared with the long crack growth behaviour of the alloy. 10:45 AM Fatigue Life of Ablation Cast 6061-T6 Components: Murat Tiryakioglu1; J. Campbell2; B. Cox3; P.D. Eason1; 1University of North Florida; 2University of Birmingham, UK; 3Alotech Ltd The fatigue life of 6061-T6 alloy, normally used in its wrought form, was investigated in this study in cast form from parts produced by the new ablation casting process. Specimens excised from the castings were first tested in unidirectional tensile test yielding elongation values comparable to forgings. Fatigue specimens tested by rotating cantilever beam revealed that the fatigue life of these castings are superior to the data from cast aluminum alloys published in the literature. 11:05 AM Mechanical Properties of Heat Exchanger Tube Materials at Elevated Temperatures: Sören Kahl1; Jozefa Zajac1; Hans-Erik Ekström1; 1Sapa Technology Since automotive heat exchangers are operated at elevated temperatures and under varying pressures, both static and dynamic mechanical properties should be known at the relevant temperatures. We have collected elevatedtemperature tensile test data, elevated-temperature stress amplitude-fatigue life data, and creep-rupture data in a systematic fashion over the past years. For thin, soft, and braze-simulated heat exchanger tube materials tested inside closed furnaces, none of the well-established methods for crack detection and observation can be applied. In our contribution, we present a simple statistical method to estimate the time required for crack initiation. 11:25 AM Fatigue Behavior and Damage Monitoring of Welded Hybrid Joints: Frank Balle1; Stefan Huxhold1; Guntram Wagner1; Dietmar Eifler1; 1 University of Kaiserslautern The request of hybrid joints, especially light metals to composites is strongly increased in the last years to realize tailored structures. Ultrasonic metal welding is one promising technology to join aluminum alloys to carbon fiber reinforced polymers (CFRP). These hybrid joints are realized by thermal softening and mechanical replacing the polymer out of the welding zone as a result of the ultrasonic shear oscillation. In contrast to conventional joining procedures this is the pre-condition which allows a direct contact between the aluminum and the carbon fibers. Due to the contacted carbon fibers it is possible to use the hybrid welds as their own fatigue damage sensors and to describe the actual fatigue status in detail. So additional to standard mechanical data the change in the electrical resistivity is monitored during the fatigue tests. Selected load-increase as well as constant amplitude tests of ultrasonically welded aluminum/CFRPjoints will be presented and discussed.

Forming and Joining 3

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Tuesday AM June 5, 2012

Room: Rangos II Location: University Student Center

Session Chair: Kaan Inal, University of Waterloo

9:35 AM Comparison of Localized Deformation in Crystal Plasticity Based Finite Element Simulations between Experimentally Measured and Statistically Generated Three-Dimensional Microstructures for the Aluminum Alloy 5754: Jonathan Rossiter1; Abhijit Brahme1; Kaan Inal1; Raja Mishra2; 1Univeristy of Waterloo; 2General Motors Research and Development Center This paper presents the actual three-dimensional (3D) grain structure of AA5754-O aluminum sheet collected by serial sectioning using a Dual Beam Focused Ion Beam equipped with Electron Backscatter Diffraction (EBSD). In this research, an evaluation of the necessity for obtaining real 3D microstructures instead of generating 3D microstructures from 2D data using statistically equivalent microstructure generation techniques is presented. A volume of 45.5x51x33μm material is sampled to construct the 3D microstructure and the corresponding equivalent 3D microstructure is generated using M-builder. These data sets are processed to build finite element (FE) meshes containing real grain morphology and orientation. FE simulations of deformation fields using rate dependant crystal plasticity theory are conducted on both the real and generated microstructures. The differences between modelling using real and generated microstructures during simulations of localized deformation are discussed. Simulations with the numerical model show significant differences in strain distribution between the two microstructures. 9:55 AM Break

Forming and Joining 5

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Tuesday AM June 5, 2012

Room: McKenna/Peter Location: University Student Center

Session Chair: Joseph Robson, University of Manchester 9:15 AM Effect of Additional Element on Hybrid Laser Weldability in AlMn Alloys: Kenta Suzuki1; Hisashi Hori1; Keiji Kanamori1; Kazumitsu Mizushima1; Junichi Kinoshita2; Tooru Murata2; 1Nippon Light Metal Company, Ltd.; 2Shibaura Mechatronics Corporation When focus on making a good products from aluminum parts, welding is one of the important issues. Recently, hybrid laser welding technique, utilizing combination of continuous wave and pulse wave laser, has been widely applied to get high quality joining of aluminum alloys. Even though apply this welding technology; weld quality strongly depend on the aluminum alloy itself. The effect of additional element in Al-Mn alloys, which are added for the purpose of improvement of tensile strength, formability etc., on the weld quality was investigated. The optimum welding conditions varied with alloy composition. Effects of welding speed and laser power on the welding quality, those are porosities, cracks and penetration depth, will be discussed.

13th International Conference on Aluminum Alloys

Technical Program

10:25 AM Invited Path Independent Polar Effective Plastic Strain (PEPS) Diagram for Sheet Forming: Jeong Whan Yoon1; Thomas Stoughton2; 1Swinburne University; 2GM R&D Center This paper reviews a pre-strain effect on necking limit of sheet metal, and discusses the importance of this phenomenon to industrial applications. The paper also discusses a solution to this challenge including adaption of the stress diagram. A new type of forming limit diagram, based on a Polar plot of the Effective Plastic Strain (PEPS) is proposed that appears to be an effective solution to the problem of nonlinear effects, with advantages of the familiar strain-based diagram for linear loading, and without the strainhardening limitations of the stress diagram, or non-intuitive aspects of the alternate Cartesian diagrams based on effective plastic strain. The benefits and limitations of each method are discussed.

11:25 AM Effect of Impact Compression on the Age-Hardening of Rapidly Solidified Al-Zn-Mg Base Alloys: Keitaro Horikawa1; Hidetoshi Kobayashi1; 1Osaka University Effect of impact compression on the age-hardening behavior and the mechanical properties of rapidly solidified Al-Zn-Mg-Cu-Ag alloy without Mn (Meso10) and with Mn (Meso20) were examined by means of the high-velocity plane collision between a projectile and the alloys by using a single powder gun. By imposing the impact compression (6 GPa) to Meso20 in the state of quenching after the solution heat treatment, the following age-hardening at 110 °C was highly accelerated. XRD revealed that high strain was introduced on the specimen inside after the impact compression. Compression test results revealed that Meso10 and Meso20 after the solution treatment, followed by the high-velocity impact compression (12 GPa) and the peak-aging treatment indicated the highest compressive yield stresses, such as 994 MPa in Meso10 and 1091 MPa in Meso20, respectively.

TUESDAY AM

9:15 AM Anisotropy and Forming Limit Diagram Comparison of DC and CC 5xxx O Temper Aluminum Alloy Sheets: Xiyu Wen1; Yansheng Liu1; Shridas Ningileri2; Tongguang Zhai1; 1University of Kenyucky; 2Secat Inc. The microstructures of the aluminum alloy sheets were studied by using optical and scanning electronic microscopes. Textures of DC and CC 5xxx aluminum alloy sheets at O-temper were measured by X-ray diffraction method and Forming Limit Diagrams (FLD) along different angles with rolling direction were obtained. The relationship between anisotropy (crystallographic texture) and FLDs was discussed. It was found that movement and changes in shape of FLDs of two Al alloys were caused by rotations of Cube, S, Copper and Brass textures.

11:05 AM From Forming Limit Curves to a Forming Limit Surface: Fadi AbuFarha1; 1Penn State Erie Lightweight alloy sheets are typically warm or hot formed under conditions where the material is rate-sensitive; this requires characterising the formability behaviour of such materials at different forming condition. Moreover, emerging forming techniques target forming under nonisothermal conditions, hence rendering a single forming limit curve insufficient for establishing the formability limits of the material during the process. In this work, we demonstrate how the concept of a forming limit surface (FLS), a 3D formability diagram with temperature or deformation rate as its third dimension, is a more comprehensive map for characterising the formability of lightweight materials, satisfying the needs of the evolving sheet metal forming industry. The focus is directed here to a 5083 aluminium alloy sheet, where the Nakazima test is used to generate the FLS of the material at temperatures ranging between 250 and 550°C.

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TUESDAY AM Technical Program 52

9:35 AM Experimental and Numerical Analysis of Formation Manner of Characteristic Wavy Morphology in Impact Welded Similar- and Dissimilar-Metal Plates: Yuya Sawa1; Shougo Kakizaki1; Shinji Kumai1; 1 Tokyo Institute of Technology The characteristic wavy interface was observed in the impact welded similar- and dissimilar- aluminum lap joints. In the present study, effects of impact conditions such as collision velocity, collision angle and materials combination on the interface morphology were investigated. The numerical simulations of the oblique collision between metal plates were performed by using smoothed particle hydrodynamic (SPH) method. The simulation could visualize the formation process of the wavy interface successfully. The wave size increased with increasing collision velocity. The interface of similar-metal joint exhibited the well-proportioned sinusoidal morphology. On the other hand, that of dissimilar joint was asymmetric wave with vortices. Occurrence of two different interface instabilities at the collision point is plausible, and the density difference is considered to control which one of them is dominant. Various joints were also fabricated by magnetic pulse welding and explosive welding. Their interface morphology agreed well with the simulation results. 9:55 AM Break 10:25 AM Influences on Arc Stability in Welding of Aluminum Pin-Structures: Lukas Wittwer1; Nasrin Jank2; Almedin Becirovic2; Andreas Waldhör2; Norbert Enzinger1; 1Graz University of Technology; 2Fronius International Pin structures offer an innovative way of joining dissimilar materials such as metals and plastics based on an additional geometric link. Therefore pins are placed on a metal sheet substrate by use of a special arc welding technique called cold metal transfer (CMT), developed by Fronius International. The key element of the CMT process is moving the wire back and forth during the welding process. This controlled movement combined with proper welding parameters allows a defined shaping of the pin. This concept has been applied successfully on stainless steel structures, both experimentally and in simulations. A major problem occurring in the framework of aluminum was the arc stability during the warm up phase originating from the oxide layer at the base material’s surface. In this work we describe how the concept of pin welding was extended on aluminum, which obstacles occurred and how they were surmounted successfully. 10:45 AM Multiscale Characterization and Mechanical Modelling of an AlZn-Mg Electron Beam Weld: Quentin Puydt1; Alexis Deschamps2; Guillaume Parry2; Sylvain Flouriot3; Sylvain Ringeval3; 1CEA/SIMAP; 2 SIMAP; 3CEA Welding of precipitation hardening alloys results in multi-scale microstructural heterogeneities, from the hardening nano-scale precipitates to the micron-scale solidification structures and to the component geometry. This heterogeneity results in a complex mechanical response, with gradients in strength, stress triaxiality and damage initiation sites.We describe the microstructure and mechanical behavior of an electron-beam welded Al-Zn-Mg alloy (7020) by combining a multi-scale quantitative characterization of the microstructure and of the mechanical properties. The microstructure is evaluated by Small-Angle X-ray Scattering and Scanning Electron Microscopy, and the mechanical properties includes local tests on micro-samples of each of the relevant weld zones, and macroscopic tests where the distribution of plastic strain is followed by Digital Image Correlation. 11:05 AM High Temperature Deformation Behavior of a 6N01 Aluminum Alloy Extrusion with a Seam Weld: Shinya Yasuda1; Ken Atsuta1; Satoshi Wakaguri1; Koji Ichitani1; Akira Hibino1; 1Furukawa-Sky Aluminum Corp.

An aluminum alloy hollow extrusion made with a porthole-die has a few seam welds. It is known that the deformation behavior of a weld region is different from that of a non-weld region at room temperature. In the present study, the influence of a seam weld on the high temperature deformation of a 6N01 aluminum alloy extrusion bar was investigated. The elongation of the alloy with the seam weld was significantly lower than that of the alloy without it. This was because the alloy with the seam weld started localized deformation at a very early stage of deformation. An orientation analysis with an electron backscatter diffraction suggested that a difference in recrystallization texture between weld and non-weld regions would accelerate the start of localized deformation. 11:25 AM Simulation of Local Material Properties during Laser Beam Welding of Aluminum-Titanium Compounds: Annika Barr1; Martin Hunkel2; Axel von Hehl2; 1IWT - Foundation Institute of Materials Science/ Lightweight Materials ; 2IWT - Foundation Institute of Materials Science/ Lightweight Materials Combinations of aluminum and titanium by firmly bonding via laser beam welding enable the production of customized hybrid designs with enhanced properties. A novel approach of coupling process, microstructure and mechanical simulation, considering the development of weld geometry and local material conditions, is intended to deliver a fast and reliable method for evaluating the quasi-static strength of laser beam welded hybrid compounds. For microstructure and mechanical simulations a comprehensive data set of material specific mechanical properties is required to reach simulation results. This includes hot tensile tests, tensile tests concerning the heat affected zone (by means of micro flat specimens) and metallographic examinations to determine the microstructure and hardness. The data set was implemented into a simulation model in order to validate the simulation results including microstructure evolution and resulting local mechanical properties. These results provide the basis for refining and advancing the coupled simulation model. 11:45 AM Finite Element Peen Forming Simulation: Alexandre Gariepy1; Simon Larose2; Claude Perron2; Philippe Bocher3; Martin Lévesque1; 1École Polytechnique de Montréal; 2Aerospace Manufacturing Technology Centre, National Research Council Canada; 3École de Technologie Supérieure Shot peening consists of projecting multiple small particles onto a ductile part in order to induce compressive residual stresses near the surface. Peen forming, a derivative of shot peening, is a process that creates an unbalanced stress state which in turn leads to a deformation to shape thin parts. This versatile and cost-effective process is commonly used to manufacture aluminum wing skins and rocket panels. This paper presents the finite element modelling approach that was developed by the authors to simulate the process. The method relies on shell elements and calculated stress profiles and uses an approximation equation to take into account the incremental nature of the process. Finite element predictions were in good agreement with experimental results for small-scale tests. The method was extended to a hypothetical wing skin model to show its potential applications.

Novel Materials 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ernest Chin, Army Research Laboratory; Warren Hunt, The Minerals, Metals & Materials Society Tuesday AM June 5, 2012

Room: Dowd Location: University Student Center

Session Chair: Warren Hunt, TMS

9:55 AM Break 10:25 AM Compression Properties of Fly Ash/Al Syntactic Foams: Qiang Zhang1; Linchi Zou1; Hang Su1; Gaohui Wu1; 1Harbin Institute of Technology Hollow-structured cenosphere fly ash were added into aluminum to fabricate lightweight syntactic foams by pressure infiltration technique. The microstructure features, such as pores size and distribution of fly ash, were analyzed. These syntactic foams were subjected to compression tests at didderent strain rates, showing three distinct stages in the stress-strain curves, namely initial elastic stage, extended plateau region and finial densification stage. As the strain rate rises, the plateau stress increases. Variations in the compressive properties of the syntactic foams were also compared with other aluminum foams.

11:25 AM ALUHAB the Superior Aluminium Foam: Norbert Babcsán1; S. Beke1; P. Makk1; P. Soki1; Gy Számel1; H.P. Degischer2; R. Mokso3; 1Bay Zoltan Applied Research Nonprofit Ltd; 2TU-Vienna; 3SLS A new metal foaming technology has been developed to produce aluminum foams with controlled cell sizes, a wide range of alloy compositions, and attractive mechanical properties. ALUHAB aluminium foams are manufactured from a special foamable aluminium alloy containing ultrafine particles (80-3000 nm). The technology uses high temperature ultrasonication to homogeneously disperse the particles and thus create a stable, foamable aluminum melt. Oscillating gas injector (loud-nozzle) technology permits the injection of optimally sized bubbles into the melt that are independent of the injector orifice diameter. Using this direct gas injection method, bubble size is regulated by the frequency and the power of the ultrasound, producing uniform bubble sizes in the sub-millimeter range. The technology results in extremely stable metal foams which can be cast into complex forms and re-melted without loss of foam integrity. Processing methods and mechanical properties of the ALUHAB foams will be discussed.

11:05 AM Self-Propagating Foaming Process of Al-Ti Reactive Precursor for Fabricating Long Scale Porous Materials: Makoto Kobashi1; Naoyuki

13th International Conference on Aluminum Alloys

Technical Program

10:45 AM Research on Preparation of Ti-Al Alloy by Thermit Reduction: Zhihe Dou1; Ting’an Zhang1; Zhaoyu Yang1; Jicheng He1; 1Northeastern University Now, the production methods of Ti-Al alloy include the mixed method of Al and Ti and the electrolysis. But the mixed method has the disadvantages such as the high cost and complex process. And the electrolysis can only get the low content of titanium alloy. This paper presents a new process of thermit reduction to produce Ti-Al alloy. The kinetics of TiO2-Al systems are studied by DSC, and the effects of the reducer type on Ti-Al alloy were studied. The results indicate that the apparent activation energy of TiO2– Al-Ti reaction system, Ea, is 131.82kJ/mol, the reaction order is n=0.6; the apparent activation energy of TiO2–Al-Ti3Al system, Ea, is 48.97KJ/mol, the reaction order is n=0.006. The Ti-Al alloy phase consist of Ti3Al and TiAl and little inclusions of Al2O3 The lowest oxygen content in Ti-Al alloy is 0.76%.

TUESDAY AM

9:15 AM Invited Microcellular Aluminium by Replication: Andreas Mortensen1; 1Ecole Polytechnique Fédérale de Lausanne (EPFL) Highly porous microcellular metallic materials, often called “metal foams”, are a subject of considerable current scientific interest. There are various ways of making porous metal: most produce “real” foams featuring closed cells while other processes result in “open-cell” foams (or “sponges”), in which pores are all interconnected. The replication process falls in the latter category. Replication processing involves the infiltration and solidification of a matrix within the open pore space of a preform material that is later leached, thus creating an interconnected network of open pores within the solid infiltrant material. With aluminium the process generally uses simple table salt (NaCl) as the preform, making it inexpensive and environmentally harmless. The presentation will provide an overview of research on this novel class of materials, with emphasis on their processing and on the exploration of the link between microstructural attributes and properties.

Kanetake1; 1Nagoya University The authors have been investigating a novel processing route in which foam materials are made by self-propagation process. This fabrication process uses chemical reactions so called “Self-propagating hightemperature synthesis (SHS)”, which releases a high heat of reaction. To make a foamable precursor, titanium and aluminum powders are blended by an appropriate blending ratios in between 3.0~10.0. An exothermic agent (boron carbide, B4C) powder, which releases high heat of reaction and increase the combustion temperature, was added to promote the foaming behavior. The powder blend was hot extruded and rolled to make long scale precursors. The thickness of the precursor was varied from 1mm to 10mm. The precursors were heated by both thermal explosion and self-propagating modes. In this presentation, we focus on the foaming behavior of long scale Al-Ti precursor, and the cell morphology of the foamed specimens.

53

Phase Transformations 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Gary Shiflet, University of Virginia; Dave Laughlin, Carnegie Mellon University Tuesday AM June 5, 2012

Room: Connan Location: University Student Center

TUESDAY AM

Session Chair: Christophe Sigli, Constellium CRV 9:15 AM Combined Effects of Low Temperature Aging and Sc Addition upon the Peak Aged Microstructure and Tensile Properties of Aluminium Alloys AA7010 and AA7017: A.K. Mukhopadhyay1; K.S. Prasad1; 1 Defence Metallurgical Research Laboratory The microstructure and tensile properties of Al-Zn-Mg base 7xxx series alloys are known to be sensitive to pre-peak aging natural and/ or low-temperature artificial aging treatments. Such low temperature aging treatments play crucial roles in encouraging the formation of plate shaped G-P II zones that act as the nucleation sites for the strengthening precipitates during subsequent peak aging treatments. In this work, the combined effects of a low temperature aging treatment together with the small addition of Sc on the peak aged tensile properties of an Al-Zn-MgCu-Zr alloy AA7010 are examined. The results showed an increase in the peak aged, 0.2% PS by about 8% without any decrease in the tensile ductility. Further results showed such beneficial effects on the peak aged tensile properties obtained for the Cu-free Al-Zn-Mg alloy AA7017. In this work, the microstructure responsible for the superior tensile properties in the aforementioned alloys are characterized and discussed.

Technical Program

9:35 AM Continuous Heating Dissolution Diagrams of Aluminum Alloys: Benjamin Milkereit1; Julia Osten1; Christoph Schick1; Olaf Kessler1; 1 University of Rostock To describe dissolution processes and also possible precipitation processes during continuous heating of aluminium alloys over a wide range of heating rates new methods have to be developed. According to common continuous heating transformation diagrams of steels [ASM 1991], continuous heating dissolution diagrams can provide information about the dissolution and precipitation behaviour of aluminium alloys depending on heating rate. The method developed by Milkereit et al. [Milkereit et al. 2009] for quenching experiments can be used, to establish continuous heating dissolution diagrams. Heating of aluminium alloys 6082, 6016 and 6005A has been investigated in the heating rate range from 0.01 to 5 K/s up to temperatures of about 580 °C in three different types of differential scanning calorimeters. The dissolution and precipitation behaviour strongly depended on initial microstructure, e.g. T4 or T6, and on heating rate. The start temperatures of dissolution and precipitation reactions increased with increasing heating rate.

54

9:55 AM Break 10:25 AM Dynamic Room Temperature Precipitation during Cyclic Deformation of an Al-Zn-Mg Alloy: Christopher Hutchinson1; Fred De Geuser2; Alexis Deschamps2; 1Monash University; 2SIMAP, Grenoble INP, UJF, CNRS The effect of pre-straining on a precipitation heat treatment is a wellchartered area and is relevant to a number of Al alloy manufacturing processes. When straining and precipitation occur concurrently, the situation is less clear. This may arise during creep, fatigue or elevated temperature forming operations. Straining introduces dislocations and strain-induced vacancies that may enhance nucleation and growth processes but the dislocations may also shear and/or cause precipitate dissolution. This

study reports a systematic characterization of precipitation during room temperature cyclic deformation of an Al-Zn-Mg alloy. The mechanical response is monitored using plastic strain controlled cyclic deformation tests and the precipitation state is characterized using small angle x-ray scattering. The initial precipitate state, the plastic strain amplitude and the strain-rate are varied systematically. The precipitate volume fraction increases with the number of deformation cycles but the mean size remains constant at ~8-10A. The underlying physical mechanisms are discussed. 10:45 AM Effects of Pre-Aging Condition on Multi-Step Aging Behavior in AlMg-Si Alloy: Yasuo Takaki1; Tetsuya Masuda1; Equo Kobayashi2; Tatsuo Sato2; 1KOBE Steel, Ltd.; 2Tokyo Institute of Technology The effects of two-step aging on the age hardening behavior in AlMg-Si alloys are well known and it is understood that clustering during 1st step aging affects the ß’’ precipitates in the final aging. However, it is not clear the “multi-step aging” behavior such as pre-aging, natural aging and final aging. In this study, four alloys containing 0.6~1.0mass%Mg and 0.6~1.0mass%Si are used. The effect of pre-aging temperature on natural aging and subsequent final ageing (bake hardening) behavior in the alloys were investigated by means of hardness test, tensile test, differential scanning calorimetry analysis (DSC) and transmission electron microscopy (TEM). As the results of hardness change, lower pre-aging temperature increase the natural age hardening, and decrease the bake hardenability with natural aging time. By comparing DSC measurements and TEM observations, it is found that cluster(1) formed during natural aging after the pre-aging, and the ß’’ decomposition temperature is moved higher with natural aging time. 11:05 AM Hardening Response to Rapid Aging Processes and Precipitation in Al-7%Si-0.3%Mg Alloy: Hengcheng Liao1; Yuna Wu1; Ke Ding1; 1 Southeast University An orthogonal test was designed to obtain a optimized rapid aging process to shorten aging time. Hardness and tensile tests and TEM observation were used to evaluate the hardening response to the rapid aging process. An optimized rapid aging process, 160oC2h+200oC2h, is obtained. Under this process, the alloy has an approximately equal hardness and strength to the conventional single stage peak aging process, but the aging time of the rapid aging process is remarkably shortened, only 16.7% of the conventional process. Compared with the conventional aging process, the number density of ß” precipitates formed during the rapid aging course is reduced, however, the amount of ß’ precipitates is remarkably increased. Though the contribution of the ß” precipitates to hardening is reduced, that of the high density of ß’ rod precipitates is considerably increased, thus the rapid aging process produces an approximately equal hardening effect to the conventional peak aging process.

TMP 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Tuesday AM June 5, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: Jozef Zrnik, Comtes FHT, Inc. 9:15 AM Capillary Tube Fabrication of A3003 Alloy for Air Condition: Hee Kyung Kim1; Guen-Ho Van1; Bong-Hak Seong1; Su-Gun Lim1; 1 Gyeongsang National University

In this study, hot extrusion characteristics of A3003 alloy to fabricate capillary tube for air condition were investigated. The extruded capillary tubes used for this experiment were obtained by hot extrusion at a deformation temperature range from to 500 to 590°C under a ram speed of 2.0mm/sec. And the extruded tubes were carried out hardness and roughness test to confirm the mechanical properties. Besides, in order to observe clarify the influence of process parameters on the grain size and formed phases, the extruded capillary tubes performed by optical(OM) and scanning electron microscope(SEM), energy dispersive spectroscopy(EDS) and X-ray diffraction(XRD). The results show that hot extrusion for A3003 alloy capillary tubes were obtained the extrudates having sound surface both inner and outer. Also, their inner and outer roughness(Rz) were indicated 0.9Z and 1.0Z, respectively. Keywords: capillary tube, hot- extrusion, A3003, roughness(Rz)

9:55 AM Break 10:25 AM Development of Multilayered Composite of 6061/2014 through ARB Process: Dharmendra Singh1; Nageswara Rao Palukuri1; Jayaganthan R1; 1 IIT Roorkee In the present investigation accumulative rollbonding (ARB) was used to develop multilayered composite of commerciallyavailable aluminum alloys 6061, 2014. Initially a sandwich of 6061/2014/6061was processed at 450 °C by giving 50% reduction. Further it has been processed through ARB up to 4th pass at 200 °C to an accumulative strain of 3.2. Amultilayered composite of 48 layers with enhanced strength up to 450 MPa with9% elongations at room temperature was achieved. This increment in strength isattributed to combination of medium strength Al 6061 alloy with high strengthAl 2014 alloy. TEM was used to study the microstructure along transversedirection and it reveals ultrafine grains with ~ 300 nm size in 4th pass ARBmaterial. Precipitation evolution of composite material was studied throughdifferential scanning calorimetry with 10 °C/ min.

11:05 AM Heat Teatment of Aluminum Cast with Stir Zone Surface Layer Type Produced by FSP Method: Piotr Uliasz1; Tadeusz Knych1; Marek Blicharski1; Beata Smyrak1; Marzena Piwowarska1; 1AGH University of Science and Technology Solidification shrinkage and wide range of solidification temperatures in Al-Si alloys are the reasons for numerous casting defects, such as porosities and shrinkages, within the alloy castings. This is a reason of problems with the quality of products made using the casting technology. One of the methods that allows to remove the casting defects is the Friction Stir Processing (FSP) process. The idea of FSP is the use of a tool which slightly penetrates the worked material and exerts a large compressive force inducing plastic deformation in the surface layer. The produced surface layer has lower mechanical properties and refined microstructure, referred to as the stir zone (SZ), as compared to the casting structure below. Aim of the work is the choice of heat treatment parameters of the A 356.0 aluminum casting alloy, which allow for an improvement of the quality and strength of a surface layer produced by the FSP method. 11:25 AM High-Pressure Torsion for Microstructure Control in Binary Al-Fe Alloys with Different States of Fe-Containing Phases: Jorge CuberoSesin1; Zenji Horita1; 1Kyushu University High-Pressure Torsion (HPT) is used to process Al-Fe alloys with different initial states of their Fe-containing phases and to study the capability to improve their overall mechanical properties. The samples used in this study include a bulk form of disks with 10 mm in diameter extracted from cast ingots and extruded rods with combinations of prior annealing. In addition, mixtures of high purity powders are processed by HPT to produce the bulk form of disks. Different fractions of Fe are added to control the initial states of the Fe-containing phases. Evolution of microstructures and mechanical properties with straining by HPT is examined using transmission electron microscopy, X-ray diffraction analysis, hardness measurement and tensile testing. It is shown that the hardness increases with increasing strain and Fe addition. Second phase particles are fragmented and some dissolution occurs with straining. Formation of intermetallic phases is also confirmed after large numbers of revolutions.

13th International Conference on Aluminum Alloys

Technical Program

10:45 AM Visualization of Material Flow in Friction Extrusion: Tony Reynolds1; Xiao Li1; 1University of South Carolina Friction extrusion was developed at The Welding Institute in the early 1990’s; however, the potential of this process has not been extensively examined. With the current emphasis on sustainability with respect to energy and material conservation, friction extrusion has become increasingly relevant as a method of low cost/low energy production of aluminum wire and consolidation of aluminum powder. The friction extrusion process is suitable for recycling of machining waste and as a route to provide feedstock for some additive manufacturing processes. In this presentation we will report on relationships between extrusion parameters (e.g. die rotation rate and extrusion force) and wire microstructure, hardness, and defect content. In addition, marker studies have been used

TUESDAY PM

9:35 AM A System for Continuous Extrusion Using High Pressure Molten Metal: Vivek Sample1; Ronald Chabal1; Vincient Paola1; Douglas Robosky1; 1Alcoa Technical Center Extrusion technology as practiced today is a batch process in which billets are sequentially extruded one piece at a time. This results in several inherent product constraints such as limited product length, undesirable interaction between extrusion ratio and product length and end crop losses. A new patented system has been developed to generate, supply and control high pressure molten aluminum. In this process high pressure molten aluminum is continuously feed to a mold in which solidification occurs under high hydrostatic pressure. The in situ billet thus formed is then extruded in the fully solid state to obtain a wrought structure and the desired product profile. Supply pressure can be modulated in real time to enhance process control stability. Novel aspects of this process, potential applications and challenges will be discussed.

to deduce material flow and, for simple cases, strain, in the extrusion die and billet chamber. Variations in material flow as functions of die geometry will be highlighted.

55

Advanced Analysis 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: David Seidman, Northwestern University; Hasso Weiland, Alcoa Inc. Tuesday PM June 5, 2012

Room: Wright Location: University Student Center

TUESDAY PM

Session Chair: Hasso Weiland, Alcoa Technical Center 2:00 PM Nano-scale Characterization of Al-Mg Nanocrystalline Alloys: Evan Harvey1; Leila Ladani1; 1University of Alabama Materials with nano-scale microstructure have become increasingly popular due to their benefit of substantially increased strengths. The increase in strength as a result of decreasing grain size is defined by the Hall-Petch equation s = s0 + kd(-1/2), where s0 is a material’s initial yield stress, d is the material’s average grain diameter, and k is a material constant. With increased interest in miniaturization of components, methods of mechanical characterization of small volumes of material are necessary because traditional means such as tensile testing becomes increasingly difficult with such small test specimens. This study seeks to characterize elastic-plastic properties of nanocrystalline Al-5083 through nanoindentation and related data analysis techniques.

Technical Program

2:20 PM In-Situ Tensile Stress Determination of an AA7xxx Alloy: Patrick Schloth1; Julia Repper2; Jean-Marie Drezet1; Vadim Davydov2; Helena Van Swygenhoven2; 1EPFL; 2Paul Scherrer Institut 7xxx aluminum alloys are high strength material often used in aerospace applications, e.g. wing skins and stringers owing to their excellent mechanical properties and, in addition, their high corrosion resistance. These properties are the result of a fine control of the alloy microstructure, e.g. state of precipitation in the matrix, obtained through appropriate heat treatments.In-situ neutron diffraction tensile tests are well suited to study the mechanical behavior of materials in dependence of crystallographic directions and possible grain texture. Such in-situ tests yield valuable information on the influence of different microstructural states on the mechanical behavior of the alloy. In this contribution, the mechanical behavior of an AA7xxx material is presented after different heat treatments. The behavior in the elastic and plastic regime is related to the different microstructural states of the alloy.

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2:40 PM Muon Spin Relaxation and Positron Annihilation Spectroscopy Studies of Natural Aging in Al-Mg-Si Alloys: Sigurd Wenner1; Kenji Matsuda2; Katsuhiko Nishimura2; John Banhart3; Teiichiro Matsuzaki4; Dai Tomono4; Francis Pratt5; Meng Liu3; Yong Yan3; Calin Marioara6; Randi Holmestad1; 1 NTNU; 2University of Toyama; 3Helmholtz-Zentrum Berlin; 4RIKEN Nishina Center for Accelerator Based Science; 5Rutherford Appleton Laboratory; 6SINTEF Muon spin relaxation (muSR) is sensitive to magnetic fields from atomic nuclei, making it suitable for studying vacancies and solute clusters inside aluminium alloys. Positron annihilation spectroscopy (PAS) gives related and complimentary information. In the last decades, there have been advancements in the precision of the measurements and the theoretical understanding of these techniques, as well as the computing power required for simulations. We have gathered muSR and PAS data from 99.99% pure aluminium and an alloy with 1.07 at.% Mg and 0.53 at.% Si after different low-temperature heat treatments. The muSR experiments are performed at the RIKEN-RAL muon facility, UK, while PAS is done at Helmholtz-Zentrum Berlin, Germany. We see a clear difference in muon

diffusion behaviour and positron lifetime between samples of different annealing times and temperatures. This can be explained by differing sizes and densities of solute clusters, which may be quantified using simulations. 3:00 PM Break 3:30 PM Monitoring Precipitation during Rapid Quenching of Aluminium Alloys by Calorimetric Reheating Experiments: Olaf Kessler1; Davit Zohrabyan1; Benjamin Milkereit1; Christoph Schick1; 1University of Rostock Several age hardening aluminium alloys, like high alloyed 2XXX, 6XXX and 7XXX alloys require high critical quenching rates of some 100 K/s from solution annealing to suppress premature precipitation and achieve maximum strength after aging [Polmear 2007]. Knowledge of the precipitation behaviour during quenching is crucial for the design of quenching processes of aluminium alloys. For monitoring the precipitation behaviour during moderate quenching, a calorimetric method (0.01 to 5 K/s) has been successfully developed [Milkereit et al. 2009]. Ultrafast chip calorimeters allow rapid quenching of aluminium alloys, but due to weak precipitation reactions the quenching results can hardly be evaluated. Hence, a new method has been developed, to monitor precipitation during rapid quenching of aluminium alloys by calorimetric reheating experiments [Zohrabyan et al. 2011]. Quenching and reheating experiments up to some 1.000 K/s of high alloyed, quench sensitive aluminium alloys, like 7049A, 7150 and 2024 will be presented. 3:50 PM Hydrogen Depth-Profiling and Desorption Kinetics in Rapidly Solidified Al-Fe Alloys: Iya Tashlykova-Bushkevich1; Goroh Itoh2; 1 Belarusian State University of Informatics and Radioelectronics; 2Ibaraki University Nowadays hydrogen represents one of the alternative sources of energy to enable the USA and EU energy security. A major safety problem within the automotive and aerospace sectors concerns the containment of H. One critical assumption is that rapidly solidified (RS) Al alloys present a challenging focus of today’s researches of H/microstructure interactions in Al alloys regarding control of H embrittlement in materials for storage of H gas. The present work studies hydrogen depth-profiling and its desorption kinetics in RS Al-Fe alloys foils. A feature of this paper is the application of ion beam analysis techniques (RBS and ERD) for surface elemental analysis combined with macroscopic investigations of H trapping in the foils through thermal desorption spectroscopy. The obtained findings demonstrate that H behavior in RS Al-based alloys strongly depends on microcrystalline structure, exhibits composition dependence and is greatly different from the one in traditionally processed Al samples. 4:10 PM Precipitation-Strengthened Al-Zr-Sc-Er Alloys with High Creep- and Coarsening-Resistance: David Seidman1; Chris Booth-Morrison1; David Dunand1; 1Northwestern University The effect of substituting Er for Sc in a dilute Al-Zr-Sc alloy was studied to develop cost-effective high-temperature aluminum alloys for aerospace and automotive applications. Spheroidal, coherent, L12-ordered Al3(Sc, Zr, Er) precipitates with a nanostructure consisting of an Er-enriched core surrounded by a Sc-enriched inner shell and a Zr-enriched outer shell were formed after aging at 400 ºC. This core/double-shell structure strengthens the alloy, and renders it coarsening-resistant for at least 64 days at 400 °C. This structure is formed due to sequential precipitation of solute elements according to their intrinsic diffusivities, Di, where DEr>DSc>DZr at 400 °C. Erbium accelerates precipitation kinetics at 400 °C, resulting in: (i) strengthening due to the elimination of lobed-cuboidal precipitates in favor of spheroidal precipitates; and (ii) a decrease in the incubation time for nucleation because DEr>DSc; and (iii) a significant improvement in the resistance of the alloy to dislocation creep at 400 °C.

4:50 PM Three-Dimensional Analysis of Microstructure in Cast Aluminium Piston Alloys: Thomas Mbuya1; Ian Sinclair1; Katherine Soady1; Philippa Reed1; 1University of Southampton The 3D architecture of intermetallics distribution in two model cast aluminium piston alloys is examined using synchrotron X-ray microtomography and advanced image analysis tools. The highly complex morphology and 3D interconnectivity of intermetallics is delineated using advanced 3D image analysis tools. A novel technique which circumvents quantification difficulties associated with the high interconnectivity is employed for quantifying intermetallic particles. The intermetallic particle size distribution is then analysed using extreme value statistics to predict the maximum particle size in a sample of S-N fatigue specimens and subsequently, the lower bound fatigue life in the given sample.

Casting & Solidification 3

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc. Tuesday PM June 5, 2012

Room: Rangos I Location: University Student Center

Session Chair: Mathieu Brochu, McGill University

3:00 PM Break 3:30 PM The Interdependence Model: An Improved Predictor of Grain Size: David StJohn1; Mark Easton2; Ma Qian1; 1University of Queensland; 2 Monash University The newly developed Interdependence model is described by an equation able to predict grain size on a more rigorous basis than has previously been possible. In this paper the model is briefly introduced and then used to predict experimentally determined grain size for a broad range of aluminium alloy compositions each cast with a range of Al-Ti and AlTiB master alloy additions. It is shown that the values of parameters obtained from the literature such as diffusion coefficient, nucleation undercooling and growth velocity, provide reasonable prediction of grain size. Insights into the affect of the distribution of the added TiB2 particle size on the efficacy of these particles are revealed clearly illustrating why so few added particles become successful nucleants. The implications of the Interdependence model for further research are also discussed. 3:50 PM Simulation of Dendrite Growth in Solidification of Al–3.0 wt.% Cu Alloy Using Cellular Automaton and Phase-Field Methods: Mohsen Asle Zaeem1; Hebi Yin2; Sergio Felicelli1; 1Mississippi State University; 2 Oak Ridge National Laboratory We developed a cellular automaton (CA)–finite element (FE) model and a phase-field (PF)–FE model to simulate equiaxed dendritic growth during the solidification of cubic crystals. Application to Al–3.0 wt.% Cu alloy illustrates the capability of both CA–FE and PF–FE models in modeling multiple arbitrarily-oriented dendrites in growth of cubic crystals. Simulation results from both models showed quantitatively good agreement with the analytical model developed by Lipton-GlicksmanKurz (LGK) in the tip growth velocity and the tip equilibrium liquid concentration at a given melt undercooling. The dendrite morphology and computational time obtained from both models are compared and the distinct advantages of both methods are discussed.

2:20 PM The Evolution of Mushy Zones in Four Dimensions: A. Johnson1; J. Fife2; J. Gibbs1; L Aagesen3; M. Miksis1; E. Lauridsen4; Peter Voorhees1; 1 Northwestern University; 2Paul Scherrer Institut; 3University of Michigan; 4 Riso Laboratory for Renewable Energy The evolution of a dendritic mushy zone following solidification can have a profound effect on the properties of castings. Using three-

13th International Conference on Aluminum Alloys

Technical Program

2:00 PM Characterization of Initial Ingot Microstructure: David Gildemeister1; 1 Alcoa Technical Center Casting of aluminum alloy ingots involves several stages including mold fill, transition, and steady state. The steady state cast microstructure has been well characterized for many alloys because of its impact on downstream processing and final properties. However, the initial and transition microstructures have not been well studied. While the initial ingot butt microstructure may not impact the final properties, it is expected to have a significant impact on the process, notably upon cracking and butt curl. In this study, simulated ingot butts of 7XXX alloys have been cast and characterized. The constituent type, volume fraction, and morphology have been examined as a function of cooling rate and composition.

dimensional insitu x-ray tomography, we investigate the dynamics of the coarsening process in mushy zones using Al-Cu and Al-Si solid-liquid mixtures. We have examined the dendritic fragmentation process when it is driven by capillarity. Both theory and tomography show that sufficiently close to the pinching event, where a dendrite arm fissions, the interfacial morphology becomes universal: the interface shape is independent of the initial morphology of both the rod phase and material system. Using insitu x-ray tomography we also examine the evolution of the mushy zone of an Al-Cu alloy. We determine the velocities of the solid-liquid interfaces and find that the average interfacial velocity is proportional to the mean curvature of the interface, despite the long-range diffusional interactions between points on the interface.

TUESDAY PM

4:30 PM Research and Development of High-Strength of Al-Zn-Mg-Cu Alloys: Roman Vakhromov1; Vladislav Antipov1; Evgeniya Tkachenko1; 1FSUE VIAM The paper is focused on high-strength alloys (UTS=600-650 MPa, UTS/d=22-23 km) which will allow one to retain aluminum’s predominant position during the next 15-20 years as applied in advanced aircraft primary structures. Parameters of microstructure (dispersoids, precipitates, degree of recrystallisation, grain size) and properties of semiproducts were studied in dependence on content of base alloying elements in chemical compositions of alloys (total sum of Zn+Mg+Cu – higher than 10 % mass). Contribution of minor additions (Zr, Sc, Ag) to strengthening and creation of improved combination of service properties was investigated. Evolution of phase composition and properties was studied as a dependence of different aging treatments.

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TUESDAY PM Technical Program 58

4:10 PM Twinned Dendrite Formation in Al-Zn-Cr under Unusual Solidification Conditions: Güven Kurtuldu1; Philippe Jarry2; Michel Rappaz1; 1 Computational Materials Laboratory, Ecole Polytechnique Fédérale de Lausanne, Station 12, CH-1015 Lausanne, Switzerland; 2Constellium CRV, ZI Centr’alp, 0725 rue Aristide Berges, BP 27, Voreppe, FR-38341, France Twinned dendrites have been observed for the first time in an Al20wt.%Zn-0.1wt.%Cr alloy solidified under conditions of low thermal gradient, low cooling rate and with very limited convection in the melt. By comparison with the microstructure of Al-20wt.%Zn solidified under identical conditions, it is shown that 0.1wt.%Cr promotes the formation of growth twins, while all previous literature reported that twinned dendrites can only be obtained under strong thermal gradient and convection. A detailed analysis demonstrates that these twinned dendrites grow along <110> directions, with trunks split in their center by {111} twin planes. The possible mechanisms responsible of twinned dendrite formation are discussed and since this occurs under laboratory scale experiment conditions, this also opens new possibility to study their formation in situ, using ultrafast X-ray synchrotron tomography or radiography. 4:30 PM Analysis of Dendritic Primary Al Grain Ripening and Solid Fraction Measurement in A356 Alloy Semi-Solid Slurry Using Segregation Sensitive Reagent: Li Gao1; Yohei Harada1; Shinji Kumai1; 1Tokyo Institute of Technology Ripening of dendritic primary Al grain in semi-solid state has been paid much attention to since it is the most economical way to produce semi-solid slurry containing spheroidal Al grains for thixocasting. Also, solid fraction is the key factor in all the semi-solid processes. A segregation sensitive reagent (Weck’s reagent) can help to study both the two topics, revealing the inner-primary Al grain’s optical microstructure evolution during semisolid heat treatments (partial re-melting) of small A356 alloy samples cut from both as-DC cast and compressed ingots (Recrystallization and partial re-melting process). With the help of this etching technique, the influence of induced strain on the ripening mechanism of primary Al grains was investigated precisely. Furthermore, the peripheral part of the primary Al grain grown during water quenching was distinguished by the reagent. Therefore we could exclude this area when measuring the solid fraction and avoid overestimation by image analysis. 4:50 PM A Dual-Scale Segregation Model for the Direct Chill Casting Process: Ravindra Pardeshi1; Simon Barker2; Biswajit Basu1; Mark Gallerneault3; 1 Aditya Birla Science & Technology Co. Ltd; 2Novelis Global Technology Center, ; 3Novelis Global Technology Center, During Direct Chill (DC) casting, it is crucial to know the degree of segregation of solute at macro/ micro scale and phases formed during casting for devising downstream processing. For the accurate prediction of macrosegregation from a macroscopic model, proper representation of micro-segregation at a sub-grid level(secondary dendrite arm space) by accounting major micro-scale processes (back-diffusion, re-melting and eutectic solidification) is very important. In the present work, a general numerical approach of coupling the temperature and concentration fields using macro/micro dual scale solidification is applied for the DC casting process. The dual scale modeling framework implementation is done using a hybrid explicit-implicit solidification scheme. The advantage of using such approach is due to sub-grid micro-segregation model while doing macrosegregation calculations, where micro-scale information is available as input to downstream models. The application of modeling approach for simulating DC casting of aluminum alloy is done and merits/demerits of models are discussed.

Fatigue and Fracture Toughness Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Krishnan Sankaran, Boeing; HJ Schmidt, AeroStruc Tuesday PM June 5, 2012

Room: Rangos I Location: University Student Center

Session Chair: Krishnan Sankaran, The Boeing Company 1:15 PM Keynote Fracture Mechanisms in Al-Cu-Li Alloys: Jean-Christophe Ehrstrom1; B. Bès1; J. Chevy1; F. Eberl2; 1Constellium CRV; 2Constellium Usine d’Issoire Compared to high toughness conventional 2000 alloys, 2198 for instance displays a 30% higher yield stress, with a still higher toughness. Whereas the 2000 alloys R-curve can be described by the combination of intra-granular damage evolution and constitutive behaviour, the shearing mechanism becomes important in Al-Cu-Li alloys especially when the thickness is reduced. In addition, intergranular failure contributes to the damage. These mechanisms are strongly related to the material texture and anisotropy, more so as the alloys are used in slightly underaged tempers. Failure mechanisms will be described and compared to those of conventional high toughness 2000 alloys and higher strength 7000 alloys like 7475.

Fatigue and Fracture Toughness 2 Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Krishnan Sankaran, Boeing; HJ Schmidt, AeroStruc Tuesday PM June 5, 2012

Room: Rangos III Location: University Student Center

Session Chair: Hans-Jürgen Schmidt, AeroStruc – Aeronautical Engineering 2:00 PM Invited Material and Structural Simulation Methodology Advancements for Fatigue and Damage Tolerant Critical Aircraft Structures – an Aluminum Supplier Perspective: Robert Bucci1; M. A. James1; M. Kulak1; M. B. Heinimann1; 1Alcoa Technical Center While aluminum alloys are available and capable of supporting static stress level increases needed to meet next generation weight reduction targets, it is the fatigue requirement that is expected to limit attainable weight and cost savings. This paper provides an overview on major areas of Alcoa research devoted to improving aluminum product fatigue and fatigue crack growth performance, including new structural concepts and related test/analysis methodologies designed to help both customers and the industry meet their design and life estimation goals. Alcoa aluminum products developed for the aerospace market provide the major application focus. Examples are provided to highlight significant achievements in areas of material fatigue behavior fundamentals, fatigue design/trade study and life prediction tools, and confirmation of new structural concept fatigue benefits all of which are currently being deployed to more rapidly introduce new and improved Alcoa aluminum products into the marketplace. 2:40 PM Fatigue Resistance of Al-Cu-Li and Comparison with 7xxx Aerospace Alloys: Armelle Daniélou1; Jean-Christophe Ehrström1; Jean-Patrick Ronxin1; 1Constellium-CRV Al-Cu-Li alloys are of great interest for aerospace applications due

to their good mechanical property balance, excellent corrosion resistance and reduced density. These alloys exhibit an increased resistance to fatigue compared to incumbent 7xxx alloys. We have studied the fatigue resistance of alloys 2050 (AlCuLi alloy belonging to the AIRWARETM family) and 7050. Crack initiation and propagation have been characterized in FEGSEM and optical observations on open hole fatigue specimens. Initiation on different constituent particles or on slip bands was observed, depending on the stress level. The relative part of initiation versus propagation in the fatigue life has been analyzed through a model based on intermetallic particle distribution and Paris’s law. The Paris law was obtained from crack growth rate measurements of long and microscopic fatigue cracks, as well as from striation lengths. The consequences for alloy and process selection will be discussed. 3:00 PM Break

4:50 PM Expanding the Availability of Lightweight Aluminum Alloy Armor Plate Procured from Detailed Military Specifications: Kevin Doherty1; Richard Squillacioti2; Bryan Cheeseman2; Brian Placzankis2; Denver Gallardy2; 1US Army Research Laboratory; 2US Army Research Laboratory, For many years, the range of aluminum alloys for armor plate applications obtainable in accordance with detailed military specifications was very limited. However, the development of improved aluminum alloys for aerospace and other applications has provided an opportunity to modernize the Army portfolio for ground vehicle armor applications. While the benefits of offering additional alloy choices to vehicle designers is obvious, the process of creating detailed military specifications for armor plate applications is not trivial. The significant amount of material and testing required to develop the details required by an armor plate specification typically requires a need statement from a vehicle program office to justify and sponsor the work. This presentation will focus on recent aluminum alloy armor plate specifications that have added capability to vehicle designers’ selection of armor materials that offer possible benefits such as lower cost, higher strength, better ballistic and corrosion resistance, improved weldability, etc.

4:10 PM Al-Li-Cu-Mg-(Ag) Products for Lower Wing Skin Applications: Lynne Karabin1; Gary Bray1; Roberto Rioja1; Greg Venema2; 1Alcoa Technical Center; 2Alcoa Mill Products Al-Li-Cu-Mg alloy/products, with and without Ag additions provide substantial performance advantages over conventional 2xxx products. For lower wing applications, the combination of specific ultimate tensile strength and plane stress fracture toughness is of particular importance and

13th International Conference on Aluminum Alloys

Technical Program

3:50 PM Influence of Microstructure on the Fretting Resistance of Al-CuLi Alloys: Jessica Delacroix1; Sophie Cazottes1; Armelle Danielou2; Siegfried Fouvry3; Jean-Yves Buffiere4; 1Universite de Lyon INSA LYON; 2 Constellium; 3Ecole Centrale de Lyon ; 4Universite de Lyon INSA LYON The resistance of two Al-Cu-Li alloys (2050 and 2196) to fretting fatigue has been investigated. For each material two heat treatments have been studied (T8 and low temperature ageing). Fretting tests with a cylinderplane configuration have been performed in the partial slip regime. The results obtained show that the low temperature temper gives a better resistance to fretting crack initiation and propagation than the T8 temper for both alloys. The 3D shape of the fretting cracks has been observed by high resolution synchrotron X-ray tomography. Multiple initiation sites were observed below the contact. In their early stages of development, the fretting cracks grow approximately radially within the material leading to thumb nail cracks which eventually merge laterally. The difference in fretting resistance is analysed with respect to the 3D fracture surface of the fretting cracks in relation with the alloys precipitation state.

4:30 PM Development of High Toughness Sheet and Extruded Products for Airplane Fuselage Structures: Paul Magnusen1; Dirk Mooy1; Les Yocum1; Roberto Rioja1; 1Alcoa High specific ultimate strength and high plane stress fracture toughness are primary requirements of aircraft fuselage skins. The performance of alloys/products used in high performance fuselage applications is first reviewed. The specific fracture toughness for products such as 2017T3, 2024-T3, 2524-T3 and 6013-T6, is discussed as a function of their composition and microstructure. Then the performance of modern AlLi alloys/products such as 2199 and 2060 sheet and 2099 and C99N extrusions is examined. It is concluded that the performance of Li containing alloys/products offer significant improvements over non-Li containing conventional fuselage products because of the optimization of strengthening precipitates and grain microstructures. The role of chemical composition and processing on resulting microstructures is discussed.

TUESDAY PM

3:30 PM Fatigue Crack Growth Behavior of 2099-T83 Extrusions in Two Different Environments: Franck Armel Tchitembo Goma1; Daniel Larouche1; Alexandre Bois-Brochu1; Carl Blais1; Julien Boselli2; Mathieu Brochu3; 1REGAL-Aluminium Research Centre, Université Laval; 2 Alcoa Technical Center; 3REGAL-Aluminium Research Centre, McGill University Aluminum-lithium alloy 2099-T83 is an advanced material with superior mechanical properties, as compared to traditional alloys used in structural applications, and has been selected for use in the latest generation of airplanes. While this alloy exhibits improved fatigue crack growth (FCG) performance over non-Li alloys, it is of interest to simulate the impact of fluctuating loads under variable temperature during airplane service, particularly in terms of the potential effects of material processing history. In the present paper, the FCG behavior in an Integrally Stiffened Panel (ISP) has been investigated both at room temperature and at 243 K. It has been shown that the resistance to crack growth in a cold environment was higher than in ambient laboratory air. Results of this investigation are discussed from the microfractographic point of view, with regard to the variation of the local extrusion aspect ratio, a parameter which correlates with both the crystallographic texture and the grain structure.

this is an area in which the Al-Li alloys can excel. Since Al-Li products have historically suffered with issues surrounding high property gradients through thickness and high degrees of tensile in-plane anisotropy, much attention has been paid to the thermo-mechanical processing routes used in fabrication. In addition, corrosion resistance has received attention since it can impact inspection intervals. In this presentation, the microstructures and properties of two new alloy/products aimed for lower wing applications, 2199-T86 and 2060-T8E86, will be reviewed and compared with conventional non-Li 2xxx products. It is concluded that the performance improvements of Al-Li alloys/products in addition to their lower density should enable significant weight savings in modern aircraft.

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3:00 PM Break

Forming and Joining 4

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Tuesday PM June 5, 2012

Room: Rangos II Location: University Student Center

TUESDAY PM

Session Chair: Shi-Hoon Choi, Sunchon National University 2:00 PM Fatigue and Creep Properties of Al-Si Brazing Filler Metals: Masakazu Edo1; Masatoshi Enomoto2; Yoshimasa Takayama3; 1Mitsubishi Aluminum Co.Ltd; 2Japan Light Metal Welding Association; 3Utsunomiya University The manufacturing process for automotive heat exchangers involves brazing using an aluminum brazing sheet. To ensure structural strength and improve durability, it is necessary to acquire mechanical properties for each of the materials. Al-Si alloys are most commonly used as the filler metal; however, the properties of the fillets formed by the solidification of the Al–Si filler melt have scarcely been reported previously. In this study, fatigue and creep properties of Al–10mass%Si cast alloy, which is considered to have the same chemical composition and metallic structure as those of the filler metal after brazing, were investigated. From the measured results of samples at various cooling rates during solidification, it was found the eutectic silicon particle size of the Al–Si alloy strongly related to these properties. These results showed that the finer silicon particles improved the fatigue and creep properties of fillets, even those with the same composition.

Technical Program

2:20 PM Effect of Additional Elements of Al-Si Filler Alloy on Flowability and Clearance Fillability during Brazing: Masakazu Edo1; Michihide Yoshino1; Shuu Kuroda1; 1Mitsubishi Aluminum Co.Ltd Aluminum alloys are widely used for automotive heat exchangers manufactured by brazing processes. All joint gaps must be filled with AlSi filler metal to prevent the leak of refrigerant. Recently, brazing of heat exchanger components has become difficult due to the decrease in the thickness of the brazing sheets. Since the fluidity of Al-Si molten metal is very high, the flow of molten filler metal sometimes causes dissolution of the base metal or defect of joints. In this study, we investigated the effect of additional elements (such as Mn, Fe, Ti and Zr) of Al-Si filler metal on the flowability and clearance fillability using our original evaluation model. The results indicated that the addition of Mn or Ti improved the clearance fillability significantly. We clarified the mechanism that additional elements change the properties of molten filler metal, by measuring the viscosity of each filler metal and observing the solidified microstructure.

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2:40 PM Influence of Erosion Phenomenon on Flow Behavior of Liquid Al-Si Filler Between Brazed Components: Takahiro Izumi1; Toshiki Ueda1; 1 Kobe Steel, Ltd. Automotive heat exchangers are predominantly composed of plates, tubes and fins. Each component is brazed by using Al-Si filler. In the plate/tube/fin brazed-structures, the flow of the liquid filler between the components affects the fillet size at each joint. In this study, the influence of the erosion phenomenon, i.e., silicon diffusion from the braze cladding into the core alloy, in the tube on the flow behavior of the liquid filler flowing on the tube from the plate to the fin has been investigated. As a result, the area of the liquid filler not flowing but existing around a phases on the tube during brazing, which is defined as filler flow channel, can change depending on the erosion degree. The flow ability of the liquid filler flowing from the plate to the fin increases as the area increases.

3:30 PM Effects of Plate Thickness and Projection Shape on the Microstructure and Strength of High-Speed Solid-State Joined 2024 Alloy Studs and 5052 Alloy Plates: Shinji Kumai1; Keisuke Hayashida1; Kento Takaya1; 1 Tokyo Institute of Technology An advanced stud joining method was developed that produces a strong joint without mechanical property degradation of the base materials. Specially designed 2024-T3 aluminum alloy studs with a circular ridge projection were pressed against 5052-H34 aluminum alloy plates of 1 to 4 mm in thickness. A high-density discharge current was run through the stud, and flowed through the projection and plate surface for several milliseconds, prompting local heating, plastic deformation, and atomic diffusion at the contact point. The projection crushed and spread along the plate surface. Asymmetrical deformation occurred on both the inner side and the outer side of the projection. For thin plates, joining mainly occurred at the outer side. For thick plates, in contrast, the deformation was largely symmetrical. Effects of discharge voltage and the projection shape were also investigated in an attempt to optimize joining strength. 3:50 PM Interfacial Reaction during Dissimilar Joining of Aluminum Alloy to Magnesium and Titanium Alloys: Joseph Robson1; Chaoqun Zhang1; Alexandra Panteli1; Dolhats Baptiste2; Emma Cai3; Philip Prangnell1; 1 University of Manchester; 2Université de Nantes; 3Altrincham Girls’ Grammar School Ultrasonic welding, a solid state joining process, has been used to produce welds between AA6111 aluminum alloy, cast and wrought magnesium alloys, and titanium 6Al-4V alloy. The mechanical properties of the welds have been assessed and it has been shown that it is the nature and thickness of the intermetallic compounds (IMCs) at the joint line that is critical in determining the strength and fracture energy. In particular, it is demonstrated that the IMC that forms in Al-Ti alloy welds is less detrimental to properties than the thick IMC layer formed in the Al-Mg welds. A model has been developed to predict IMC formation during welding and provide an understanding of the critical factors that determine the IMC layer thickness in welds between aluminum and dissimilar metals. This has been used identify strategies for controlling the IMC layer thickness and hence weld properties. 4:10 PM Joining of 2024 Aluminum Alloy Stud to AZ80 Magnesium Alloy Extruded Plate by Advanced High-Speed Solid-State Method: Yohei Harada1; Yutaro Sada1; Shinji Kumai1; 1Tokyo Institute of Technology For its potential usefulness for weight reduction, an advanced high-speed solid-state joining method was tested for its applicability to the joining of 2024 aluminum alloy studs to AZ80 magnesium alloy extruded plates. In this method, a stud having a circular projection at its bottom is pressed against a plate surface, whereupon a discharge current applied to the upper part of the stud flows through a contact point between the projection and the plate to form a joint between them. Observations of the joint area reveal a projection structure sticking into the plate and bending toward the outside, in line with the predominant path of current flow. Refined grains of AZ80 magnesium alloy were observed in the vicinity of the joint interface. This reveals that local plastic deformation and heating induced dynamic recrystallization within the plate. Tensile fracture strength was not found to increase with increasing discharge voltage. To maximize that strength, it was instead found necessary to select an appropriate discharge voltage. 4:30 PM Interface Structure and Bonding in Rapid Dissimilar FSSW of Al to Steel Automotive Sheet: Phil Prangnell1; Yingchun Chen1; 1The University of Manchester

Producing robust joints between Al and steel sheet by friction stir spot welding (FSSW), within a weld cycle time short enough for industrial application, is extremely challenging. The issues faced by conventional FSSW are discussed, including the role of the material flow behaviour and modelling of the intermetallic reaction layer seen at the weld interface. A possible solution is presented, termed “Abrasion Circle Friction Spot Welding”; with this approach a probe tool is translated through a circular path to abrade the steel surface. It is shown that successful welds can be produced between Al-61111 and DC04 steel 1 mm sheets with a cycle time <1 second that exhibit high failure loads and a nugget pullout fracture mode. The mechanisms of weld formation and the joint interface structure are discussed. TEM investigation of the joint interface revealed no intermetallic reaction layer with this process.

Forming and Joining 6

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Tuesday PM June 5, 2012

Room: McKenna/Peter Location: University Student Center

2:40 PM Microstructure Evolution and Tensile Property of Al-4.35Cu-1.53Mg Alloy during Creep Age Forming Process: Shanshan Wang1; Jiantang Jiang1; Kun Zhang2; Junzhou Chen2; Liang Zhen1; 1Harbin Institute of Technology; 2Beijing Institute of Aeronautical Materials Creep age forming (CAF) is an effective technology to manufacture large aircraft panel components of aluminum alloys. CAF has attracted much attention, however, the evolution of microstructure and performances during this process remains unclear. In the present work, microstructure evolution and tensile property of Al-Cu-Mg alloy during CAF process was investigated by combination of TEM, tensile tests and electrical conductivity tests. It was found that the presence of external stress had performed a slight but clear influence on the precipitations and the related age-hardening behavior. The precipitation process of S phases was accelerated. Compared with stress-free-aged ones, stress-aged samples achieved peak strength within shorter ageing time and also exhibited higher yield strength at under-aged condition, but lower yield strength at over-aged stage. The electrical conductivity of stress-aged samples was higher than those of stress-free-aged samples. The effect of stress on microstructure and tensile property of Al alloy was discussed.

TUESDAY PM

4:50 PM Cancelled Simultaneous Behavior of Foaming and Bonding for Aluminum Foam Panel: Yuko Okano1; Yuji Kume1; Makoto Kobashi1; Naoyuki Kanetake1; 1 Nagoya University

maximum elongation-to-failure of 486% was found at the temperature of 500 ºC and strain rate of 10-4s-1. To identify the main charecteristics of superplastic deformation of the alloy, the microstructure and fracture of the alloy are analyzed as a function of strain, strain rate and temperature using optical microscopy (OM) and electron microscopy (SEM). The strain rate sensitivity (m) of the alloy was also studied.

3:00 PM Break

Session Chair: Kaan Inal, University of Waterloo

3:50 PM Cancelled The Effect of Grain on Strain Localization and Damage under Uniaxial Tensile Loading of A356 Alloy: Mahmoud Marzouk1; Mukesh Jain1; Sumanth Shankar1; 1McMaster Univeristy

2:20 PM Investigation of Superplasticity in Aluminum Alloy 5083: Shasha Zhao1; Rehan Qayyume1; Haoyan Diao1; Chaoli Ma1; Yong Wang2; Xiaowei Wu2; 1Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University; 2Beijing Research Institute of Mechenical & Electrical Technology The superplastic response of commercial 5083 alloy (Al-4.42Mg) under uniaxial tension at strain rates ranging from 5×10-5 to 10-2s-1 in the temperature interval 400~550ºC was systematically studied in this paper. The tensile test was conducted on samples of rolling direction. The

13th International Conference on Aluminum Alloys

Technical Program

2:00 PM Changes in Microstructure During High Strain Rate Superplastic Deformation of an Al-Zn-Mg-Cu-Zr Alloy Containing Sc: A.K. Mukhopadhyay1; K.S. Prasad1; A. Kumar1; S. Raveendra2; I. Samajdar2; 1 Defence Metallurgical Research Laboratory; 2Indian Institute of Technology Bombay The changes in microstructure with respect to the variation in the morphology of Al3ScxZr1-x dispersoids and evolution of recrystallized grains, during superplastic deformation (SPD) (at 475C, 1.9x10-2s-1) of a suitably thermo-mechanically processed (TMP) aluminium alloy AA7010 containing Sc have been examined. It is observed that the morphology of Al3ScxZr1-x dispersoids present in the homogenized condition continually change during subsequent TMP through different stages of SPD process. The number density of the dispersoids is reduced to a minimum during TMP, whilst the number density of the dispersoids significantly increases with strain during the subsequent SPD process. A simultaneous change in the microstructure during SPD is the gradual increase in the percentage recrystallization with strain. Recrystallization occurred by continuous recrystallization process except at the very early stages of SPD wherein there existed a reduced number density of the dispersoids and the texture index showed a significant increase.

3:30 PM New Analysis of Solute Drag in AA5754 by Precise Determination of Point Defect Generation and the Orowan Relation: Brad Diak1; Alex Penlington1; Shig Saimoto1; 1Queen’s University Serrated deformation in Al-Mg alloys creates problems that affect consumer product acceptability. This effect is usually attributed to the Portevin-LeChâtelier effect. In this study the inverse PLC effect due to solute drag on moving dislocations is examined in AA5754. The drag mechanism is dependent on the diffusivity of the solute which is inturn dependent on the point defect evolution during deformation. The parabolic James-Barnett model for the drag force and velocity is used to predict the velocity at which drag occurs at temperature. A new slipbased constitutive relation determines the volume fraction of point defects evolved in combination with the Orowan relation. The comparative difference between the two predictions is resolved by calculating the effective activation energy for the diffusivity from which the amount of point defects required is derived. The fits are in very good agreement with the strain rate jump-down tests that characterize the solute drag profile.

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TUESDAY PM

4:10 PM The Influence of Microstructure and Composition on the Machinability of Al-Si Alloys: Yasser Zedan1; A.M. Samuel1; Fawzy Samuel1; S. Alkahtani2; 1UQAC; 2Salman Bin Abdulaziz University, AlKharj, Saudi Arabia The motivation to replace steel and cast iron with Al-Si alloys in automotive components stems from an on-going attempt to improve fuel economy and reduce emissions. In the light of these objectives, a study was carried out to determine the influence of metallurgical parameters such as chemical composition, microstructure and morphology of second phase particles formed in 396 type near-eutectic Al-Si cast alloys containing ~11% Si, on their machinability. The results show that the Mg-free alloy displays only a slight increase in the drilling force, moment, and power with the progress of drilling, while in comparison, the Mg-containing base alloy shows a rapid increase in these same parameters. The Mg-free alloy produces the highest number of holes, followed by the alloys containing 0.3% Mg, and 0.6% Mg, respectively. The chip breakability of the alloys containing the Al2Cu phase is superior to that of the alloys containing Mg2Si. 4:30 PM Cancelled Effects of Electric Currents on the Mechanical Behavior of Two Different Aluminum Alloys under Quasi-Static Uni-Axial Tensile Loads: Jeong-Jin Seo1; Jae-Hun Roh1; Yong-Ha Jeong1; Sung-Tae Hong1; John Roth2; 1University of UIsan; 2Penn State Erie, The Behrend College 4:50 PM Modeling of Transients as a Response to Changes in Strain-Path of Commercially Pure Aluminium: Tomas Manik1; Bjørn Holmedal1; Odd Sture Hopperstad1; 1Norwegian University of Science and Technology Changes in the strain path are inherently involved in metal forming operations. Metals typically show transient behavior of the stress upon the sudden or continuous change in deformation conditions. Unexpected softening due to the strain path changes can have impact on forming due to the flow localization, leading to necking, eventually fracture. Hence, there is a need to accurately predict mechanical behavior of metals due to the changes in strain paths. Continuum phenomenological model proposed by Holmedal (Holmedal, B. et al., Proc. ICAA12, 2010, Japan) has been implemented into explicit FEM solver LS-DYNA with an isotropic high order exponent yield criterion. This model has been applied to capture transient response of as-cast aluminium of commercial purity. Strain path changes have been introduced into the material by rolling and subsequent uniaxial tension and compression at various angles in order to cover large range of strain path changes.

Novel Materials 3

Technical Program

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ernest Chin, Army Research Laboratory; Warren Hunt, The Minerals, Metals & Materials Society

62

Tuesday PM June 5, 2012

Room: Dowd Location: University Student Center

Session Chair: Warren Hunt, TMS 2:00 PM Invited Enhanced Performance of Layered/Laminated Aluminum Systems: John Lewandowski1; 1Case Western Reserve University Layered/laminated aluminum alloys provide a range of potential property combinations for lightweight energy-efficient materials not possible via monolithic alloys. This presentation will summarize published work on various routes used to produce such layered/laminated systems and

some of the property combinations possible in comparison to monolithic materials. Roll bonding, co-extrusion, and adhesive bonding have been used to produce layered/laminated metal composites as well as nanocomposites via extrusion of amorphous aluminum alloy powders. Various property comparisons will be provided, while other potential approaches of creating such layered materials will also be discussed. 2:40 PM Microstructures and Mechanical Properties of Al-Al2O3 Composites Processed by Disk-HPT and Ring-HPT: Maki Ashida1; Zenji Horita1; 1 Kyushu University In this study, Al-Al2O3 composites were produced by consolidation of Al micrometer powders and Al2O3 nano-powders using high-pressure torsion (HPT). The pure Al powders were first mixed with a 30% volume fraction of the Al2O3 powders by ball milling (BM) and the powder mixture was consolidated by HPT at room temperature with a rotation speed of 1 rpm under a pressure of 6.0 GPa for disk samples (Disk-HPT) and 3.0 GPa for ring samples (Ring-HPT). The composites were also produced by HPT without BM for comparison. Microstructures were observed by optical microscopy and transmission electron microscopy including X-ray diffraction analysis. Density and Vickers microhardness were also measured. The composites consolidated by HPT using BM powders showed more uniform dispersion of Al2O3 in the Al matrix and higher hardness values. Uniform dispersion was better achieved by Ring-HPT than Disk-HPT. 3:00 PM Break 3:30 PM Powder Metallurgy of High Strength Al84Gd6Ni7Co3 Gas-atomized Powder: Prashanth K G1; K.B. Surreddi2; Sergio Scudino1; Zhi Wang1; D. J. Sordelet3; JĂźrgen Eckert1; 1IFW Dresden; 2Chalmers University of Technology; 3Advanced Materials Technology Group, Caterpiller Inc. Al-based amorphous and nanocrystalline materials are of particular interest because of their high strength combined with low density. Powder metallurgy is one of the inexpensive techniques for producing these innovative materials, with powder consolidation playing a major role in tuning their mechanical properties. This work focuses on the sintering by hot pressing of partially amorphous Al84Gd6Ni7Co3 powders with varying time, temperature and pressure. Depending on the sintering conditions, the amorphous powder precursors crystallize partially or completely during compaction and the density of the compacts depends on several factors like the porosity level, the amount of residual amorphous phase and the crystallized phases. The mechanical behavior of the bulk compacts were then investigated by room temperature compression tests with the hot pressing parameters optimized to achieve the best mechanical properties. The results indicate that the consolidation parameters have a strong influence in dictating the mechanical properties of these novel Al-based alloys. 3:50 PM Advanced Class of FML on the Base Al-Li Alloy 1441 with Lower Density: Vladislav Antipov1; Olga Senatorova1; Nataly Lukina1; 1FSUE VIAM Structure, composition, properties combination of specimens and components, a number of technological parameters for production of advanced FML based on high-modulus Al-Li 1441 alloy (E ~ 79 GPa) with reduced density (d ~ 2.6 g/m3) and optimized adhesive prepreg reinforced with high-strength high-modulus VMP glass fibres are described. Service life 1441 alloy provides the possibility of manufacture of thin sheets (up to 0.3 mm), clad and unclad. Moreover, some experience on the usage of 1441 T1, T11 sheets and shapes in Be 200 and Be 103 aircraft was accumulated. The class of FML materials based on Al-Li alloy provide an ~5% improvement in weight efficiency and stiffness of skin structures as compared with those made from FML with conventional Al-Cu-Mg

(2024T3 a.o.) and Al-Zn-Mg-Cu (7475T76 a.o.) alloys.

4:30 PM Cancelled Properties of Aluminum Based Magnetic Materials Produced by Compressive Torsion Processing: Gaku Sogabe1; Yuji Kume2; Makoto Kobashi2; Naoyuki Kanetake2; 1Nagoya University ; 2Nagoya University 4:50 PM Solute Distribution and Mechanical Properties of Ultra-Fine-Grained Al-Mg Alloys: Richard Karnesky1; Nancy Yang1; Chris San Marchi1; Troy Topping2; Zhihui Zhang2; Ying Li2; Enrique Lavernia2; 1Sandia National Laboratories; 2University of California, Davis Ultra-fine-grained (d~200 nm) Al-Mg alloys exhibit outstanding strength due to both Hall-Petch grain-size strengthening and solid-solution strengthening. When the solubility limit is exceeded, some Mg segregates to grain boundaries. This impacts both thermal stability and mechanical properties. In this study, alloys with between 0 wt.% Mg (pure Al) and 10.5 wt.% Mg are made by ball milling powders in liquid nitrogen, and consolidated by hot isostatic pressing and extrusion. The alloys are exposed to temperatures up to 500 °C. Microhardness and tensile behavior are measured and correlated with the microstructure, as measured by local-electrode atom-probe tomography, X-ray diffraction, and electron microscopy.

Phase Transformations Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Gary Shiflet, University of Virginia; Dave Laughlin, Carnegie Mellon University Tuesday PM June 5, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: Gary Shiflet, University of Virginia

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Gary Shiflet, University of Virginia; Dave Laughlin, Carnegie Mellon University Tuesday PM June 5, 2012

Room: Connan Location: University Student Center

Session Chair: Kenji Matsuda, University of Toyama 2:00 PM The Effect of Natural Aging on Quench Sensitivity in Al-Mg-Si Alloys: Katharina Strobel1; Mark Easton1; Lisa Sweet1; Nick Parson2; 1CAST CRC - Monah University; 2Rio Tinto Alcan Quench sensitivity in age hardenable aluminum alloys has been attributed to solute loss on heterogeneous nucleation sites during slow cooling after extrusion. However, recent work on the influence of natural aging at room temperature on artificial ageing response suggests that quenched-in vacancies play a significant role in clustering and precipitation behavior of strengthening precipitates. Three different high-strength Al-Mg-Si alloys were cooled at different rates and artificially aged at 175ºC after 30 min or 24 h natural aging at 18ºC. While natural aging was confirmed to have a negative effect on the age-hardening response of fast cooled samples, the aging response of slow quenched samples was independent of natural aging time. Therefore the effects of quench sensitivity are less apparent after prolonged natural aging. It is further concluded that quench sensitivity is also affected by changes in aging kinetics due to loss of quenched-in vacancies during slow cooling. 2:20 PM Thermodynamics of Al3Li Nano-Clusters in an Aluminum Solid Solution: Christophe Sigli1; Joël Lépinoux2; 1Constellium CRV; 2SIMAP INP Grenoble An accurate thermodynamic description of nano-clusters in a solid solution is a pre-requisite for a reliable predictive homogeneous nucleation model. Unfortunately, classical textbook descriptions which consiss in describing the free energy as a sum of a volume energy part and a surface energy parts fail to capture the thermodynamic of small clusters at high enough temperatures. Equilibrium Monte Carlo (MC) calculations have been performed to study the free energy of Al3Li clusters as a function of size and temperature. Constant first and second nearest neighbor interactions were used. Calculations show that above -50°C, the simplistic textbook description fails to reproduce the free energy of Al3Li nanoclusters and that a more complex description is required to reproduce MC results and to capture the cluster entropy. The impact on nucleation rate of Al3Li will be illustrated. This study is part of a modelling project simulating the microstructure of AIRWARETM alloys.

13th International Conference on Aluminum Alloys

Technical Program

1:15 PM Keynote Nanocluster Formation Behavior in Al-Zn-Mg Alloys with Microalloying Elements and Improved Mechanical Properties: Tatsuo Sato1; Tomo Ogura2; 1Tokyo Institute of Technology; 2Osaka University The formation behavior of nanoclusters and precipitates in Al-Zn-Mg alloys containing microalloying elements was investigated using TEM and 3DAP techniques. The grain size of the alloys was controlled to investigate its influence on the nanocluster formation. In the Al-Zn-Mg alloys, small amount of Mn is effective to refine grains. The age-hardening behavior and precipitate microstructures in the alloys with refined grains were complicated. In the grain refined alloy the age-hardening is markedly decreased and precipitation is greatly suppressed. It is found that

Phase Transformations 3

TUESDAY PM

4:10 PM The Preparing Technology of Cu-Al Dual Metal Composite Material via Electrodeposition Method: Yihan Liu1; Jing Li1; Ming Zhao1; 1 Northeastern University As a type of composite materials, Cu-Al composite material does not only possess the advantage of good electric conductivity, high hot conductivity and attractive appearance like copper, but also has light density, low price and serviceable like aluminum. Traditionally, the manufacturing technology for this material is rolling, blasting, mould casting and mould rolling. A technique has been explored in this article for fabrication of this material, which is electrodepositing copper on the surface of aluminum having a layer of chemical converted film. On the base of discussing the process of chemical treatment on Al, the technology of electrodepositing Cu on Al is studied afterward. The optimized parameter has been obtained and the property of the material prepared by this technique has been tested. The results show that this method can produce the Cu-Al composite material easily, especially for the complicated shape workpiece.

the microalloying elements of Ag and Sn are effective to increase agehardening and to produce refined precipitates in the refined grain alloy. The behavior is similar to the phenomenon of the reduced width of PFZs. The important feature of microalloying elements is the interactions with vacancies and solute atoms. The alloys with refined grains and reduced PFZs exhibit high strength and high ductility.

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TUESDAY PM Technical Program 64

2:40 PM The Effect of Cu and Cr on Clustering and Precipitation in Al-Mg-Si Alloys: Zeqin Liang1; Cynthia Sing Ting Chang1; John Banhart1; Jürgen Hirsch1; 1Helmholtz Center Berlin for Material and Energy A group of alloys based on pure ternary Al-0.4wt%Mg-1.0%Si with Cu, Cr and Zr were used to study the effect of impurities on clustering and precipitation. Samples with different natural ageing time after solution heat treatment and ice water quenching were tested by Differential Scanning Calorimetry. The results show there are two clustering processes in all the alloys and the fundamental sequence do not change by additional trace elements. The first clustering process cannot be observed in the sample naturally aged for more than 1000 minutes. A model incorporating two independent kinetics is used to study the clustering behavior. It is found that the first clustering process was hindered by Cu. The formation peak of \946” was analyzed by using another model considering nucleation and growth. The modeled results show that the nucleation and growth rate is different in the alloys which is compatible to observations from Transmission Electron Microscopy. 3:00 PM Break 3:30 PM Influence of Mg and Si on Cluster Formation in Al-Mg-Si Alloys Studied by Positron Annihilation Lifetime Spectroscopy: Meng Liu1; Yong Yan2; Zeqin Liang1; Cynthia Chang1; John Banhart1; 1Helmholtz Centre Berlin for Materials and Energy; 2Technische Universität Berlin Age-hardenable Al-Mg-Si (6000 series) alloys are the most frequently used commercial alloys. After natural ageing (NA), alloys with various Mg and Si contents exhibit either “positive” or “negative” strength response during subsequent artificial aging, which is caused by clusters formed during NA. Previous studies focused on clustering formation in Al-MgSi alloys by using positron annihilation lifetime spectroscopy (especially sensitive to vacancies) found that the entire evolution consists of at least 4 stages. However, the exact interpretation of the underlying microscopic processes is still under dispute. Therefore, in-situ positron lifetime experiments were carried out for pure Al-Mg and Al-Si binary alloys with different solute concentrations (0.005at.%-1at.%) in order to clarify the behaviour of Mg/Si atoms on the clustering formation processes from a vacancy perspective. The interpretation of such experiments is supported by Kinetic Monte-Carlo calculations based on experimental parameters for diffusion and binding coefficients. 3:50 PM Microstructural Characterization of Flexcast® Al-Mg Alloys with Sc and Zr Additions: Dae Hoon Kang1; Mojan Sohi2; Hashem Mousavi Anijdan1; Nitin Singh1; Mark Gallerneault1; 1Novelis Inc.; 2University of British Columbia This contribution focuses on the microstructural characterization work performed on Flexcast® Al-Mg alloys with Sc and Zr additions. Two alloy compositions were investigated: one with and the other without Sc. In the as-cast state, both alloys showed a fine distribution of Al-Mg-Fe intermetallic compounds along the solidification cell/dendrite boundaries - due to the high solidification rate in the belt caster. During aging heat treatments, nano-sized precipitates were formed in the matrix while the intermetallic compounds coarsened. As commonly described in literature, the finely dispersed coherent precipitates had an L12 structure. These are known to significantly enhance the strength of the aluminum alloys. TEM results are presented investigating the presence of a cored-shell structure in the precipitates. The role and influence of Zr on the microstructural deevelopment were also investigated. 4:10 PM Application of an Isothermal Calorimetry Technique to Determine TTP Diagrams for AA6xxx Alloys: Leo Colley1; Nitin Singh1; Cyrille Bezençon1; 1Novelis Inc.

Quantitative description of precipitation processes is of importance for alloy development and process optimization in 6000 series alloys. An isothermal calorimetry technique was used to measure the exothermic heat evolution of an AA6xxx alloy during artificial ageing following various interrupted quench experiments in the temperature range 250-450°C. Subsequently, the total heat measured in the calorimeter was used to estimate the amount of solute present in the alloy at room temperature following quenching and to construct a Time-Temperature-Precipitation (TTP) diagram for precipitation of solute during the interrupted quench. The predictions made using the TTP diagram were validated by comparing with quantitative measurements of the volume fraction of grain boundary precipitates formed during the interrupted quench experiments, as well as electrical resistivity and microhardness measurements of the alloy in the peak-aged condition. 4:30 PM Influence of Chemical Composition on Aging Property of 7204 Aluminum Alloy: Tadashi Minoda1; Hideo Yoshida1; 1Sumitomo Light Metal Industries, Ltd. The influence of the room temperature pre-aging (RTPA) conditions on the strength of 7204 aluminum alloy in T6 temper was changed by the zinc and magnesium contents. When both the zinc and magnesium contents were the lowest and the RTPA was omitted, the strength became the lowest because the aging rate during artificial aging decreased and a non-homogeneous precipitation of the eta-prime phase occurred. On the other hand, the eta-prime phase became finer and the strength in T6 temper became higher as the RTPA was longer and higher. Also, the two-step artificial aging resulted in a higher strength. Furthermore, the influence of RTPA on the strength in T6 temper decreased with the increasing zinc and magnesium contents, and it almost disappeared when both the zinc and magnesium contents were maximum values. 4:50 PM Transforming of the Morphology of Iron Phases in Aluminum Alloys: Vladimir Cheverikin1; Vadim Zolotorevskiy1; Alexandra Khvan1; 1National University of Science and Technology “MISiS” Iron containing phases with unfavorable morphology almost always exist in commercial aluminum alloys. The attempt to change morphology of the iron containing phase by addition of different alloying elements was made in present work. Experimental and thermodynamic studies of multicomponent phase diagrams with additions of refining elements were carried using ThermoCalc software and analysis of microstructures of the alloys in as-cast and annealed states. The possibility to obtain iron containing phases with almost spherical morphology, which allows to neutralize negative influence of iron on ductility and fracture strength of alloy, was presented in the work.

TMP 3

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Tuesday PM June 5, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: Vivek Sample, Alcoa Technical Center 2:00 PM Process Analysis of the Co-Extrusion of Aluminum and Titanium Alloys: Norbert Grittner1; Barbara Striewe2; Martin Hunkel2; Marcus Engelhardt1; Christian Klose1; Axel von Hehl2; Mirko Schaper1; HansWerner Zoch2; Friedrich-Wilhelm Bach1; 1Leibniz Universität Hannover

2:20 PM Rheo-Extrusion of Hypoeutectic Al-Si-Mg-Fe Alloy: Yasuhiro Uetani1; Nanako Mori2; Masayoshi Dohi3; Kenji Matsuda2; Susumu Ikeno4; 1 Toyama Prefectural University; 2University of Toyama; 3Sankyo Materials Co. Ltd.; 4Toyama College of Technology Improvement of poor ductility in normally processed Al-6.9%Si0.33%Mg-1.2%Fe alloy with coarse Al5FeSi intermetallic compound beta phases was tried by the rheo-extrusion process utilizing semi-solid slurry, which had been made by a newly developed octagonal rotor process. The obtained slurry had relatively fine solid granules and considerably smaller beta phases than those of usual castings. When rheo-extrusion tests at the constant extrusion ratio of 36 were carried out at various semi-solid temperatures and ram speeds, the round bars of 6mm diameter with smooth sound surfaces were obtained excet for tip portions in the every extrusion conditions. Microstructures of the bars consisted of almost fine equiaxed alpha grains, polygonal shaped eutectic and beta phases. If forced aircooling treatments were given at the adequate position under the die outlet during rheo-extrsion, the rheo-extruded bars had an excellent tensile strength and ductility at T6 condition, comparble with those of the ironfree alloy. 2:40 PM Simultaneous Improvement of Strength and Ductility in Al-Ag Alloys Processed by High-Pressure Torsion and Aging: Seungwon Lee1; Zenji Horita1; 1Kyushu University High-pressure torsion (HPT) is conducted on age-hardenable AlXwt%Ag (X= 5, 11, 20) alloys for grain refinement to the submicrometer level. The HPT-processed alloys are then aged at a temperature of 50, 75 or 100°C for periods up to 3.9 days. Vickers microhardness measurements and tensile tests show simultaneous improvement of strength and ductility. Observation by TEM shows that grain refinement to a grain size of ~300 nm is achieved. Spherical η-zones which are formed in the fine grains during an initial stage of aging treatment improves the mechanical properties without grain coarsening. 3:30 PM Microstructural and Mechanical Evolutions during the Forging Step of the COBAPRESS, a Casting/Forging Process: Frederic Perrier1; Christophe Desrayaud1; Véronique Bouvier2; 1Ecole Nationale Supérieure des Mines de Saint-Etienne, Laboratoire Claude Goux UMR CNRS 5146; 2 Saint-Jean Industries Aluminum casting/forging processes are used to produce parts for the automotive industry. In this study, we examined the influence of the forging step on the microstructure and the mechanical properties of an A356 aluminum alloy modified with strontium. Firstly, a design of samples which allows us to test mechanically the alloy before and after forging was

3:50 PM The Bonding Behavior of Co-Extruded Aluminum-TitaniumCompounds: Barbara Striewe1; Martin Hunkel1; Axel von Hehl1; Norbert Grittner2; 1Foundation Institute of Materials Science / Lightweight Materials; 2Institute of Materials Science, Hannover Combination of aluminum and titanium enables the design of lightweight structures with tailor-made properties at global as well as local scale. In this context the co-extrusion process offers a great potential for advanced solutions for long products especially being applied in the aircraft and automobile sector. While titanium alloys show particular high mechanical strength and good corrosion resistance, aluminum alloys provide a considerable high specific bending stiffness along with lower materials costs. The formation of intermetallic layer during co-extrusion, the mechanism of adhesion between aluminum and titanium, and the mechanical properties of the intermetallic layer were investigated in detail. In order to understand the development of the intermetallic layer results of diffusion bonding experiments were compared with those of co-extrusions. The layer was characterized by optical microscope, scanning electron microscopy and electro beam micro-analysis. Mechanical properties were determined by tensile tests. Additionally, co-extrusion experiments were simulated by means of FEM. 4:10 PM The Effect of Heat Treatment Technology on Mechanical Properties of Al/Al Alloys Clad Sheet Fabricated by Hot Roll Bonding: Zejun Chen1; Quanzhong Chen1; Qing Liu1; 1Chongqing University The composites can combine the excellent properties of different materials, and obtain an outstanding mechanical property. In this paper, the Al/Al alloy (1100/7075) multilayer sheets are fabricated by hot ARB (Accumulative roll bonding) of five clad sheet. For laminated sheet, the different heat treatment (solution and aging) are carried out for the multilayer sheets. The aging time and different processing heating treatment temperature are taken into account in the experiments. The optimized heat treatment technology is obtained by the comparison of mechanical properties. 4:30 PM Orientation Dependent Subgrain Growth During Isothermal Annealing of High-Purity Aluminum: Sindre Bunkholt1; Knut Marthinsen1; Erik Nes1; 1NTNU The introduction of new recycle friendly alloys has necessitated improvements in models for predicting softening behaviour during annealing. Current models can be further developed through a better understanding of the sub-gain growth and recovery kinetics with respect to variations in microchemistry. For this purpose, high purity aluminium, binary alloys with different levels of Mn in solid solution and commercial Al-Mn alloys have been cold-rolled to a strain of 3.0 and isothermally annealed. Softening kinetics have been studied in the scanning electron microscope with the electron backscatter diffraction (EBSD) technique, making careful investigations of sub-grain growth rates in different texture components feasible. Preliminary results of high purity aluminium show moderate growth followed by a weak reduction of average misorientations in regions with typical deformation textures. Stronger growth is observed where the texture is close to Cube and average misorientations are both larger and more stable with annealing.

13th International Conference on Aluminum Alloys

Technical Program

3:00 PM Break

created. A finite element analysis with the ABAQUS software predicts a maximum of strain in the core of the specimens. Observations with the EBSD technique confirm a more intense sub-structuration of the dendrite cells in this zone. Yield strength, ultimate tensile strength, elongation and fatigue lives were then improved for the casting/forging samples compared to the only cast specimens. The closure of the porosities and the improvement of the surface quality during the forging step enhance also the fatigue lives of the samples.

TUESDAY PM

Institut für Werkstoffkunde; 2IWT Stiftung Institut für Werkstofftechnik This document provides the results of the process analysis of the coextrusion of aluminum and titanium alloys. The compound consists of the slave material aluminum and the core material titanium. The investigation determines the influence of the parameters billet temperature, press ratio and core length on the process. The material combinations used for the experiments were Al99,5 - Ti Grade 2, EN AW-2024 – TiAl6V4 and EN AW-6082 – TiAl6V4. The titanium core material was inserted in a drilled and machined aluminum billet. Furthermore, mechanical properties of the interface were determined by tensile and shear tests. Additionally, the formation of the interface was characterized by scanning electron microscopy, electron probe micro analysis and energy dispersive X-ray spectroscopy. The aim of the presented investigations is to show the technical feasibility of the co-extrusion of aluminum-titanium-compounds and to control the growth of intermetallic phases in the interface to increase the mechanical properties.

65

4:50 PM Effect of Nickel Variation and Thermomechanical Treatment on Microstructure and Properties in Aluminum Alloy Fin Stock for Heat Exchanger : Suk-Bong Kang1; Dong-Bae Kim1; Jaehyung Cho1; 1Korea Institute of Materials Science Aluminum alloys are commonly used as a material for heat exchangers due to their higher thermal conductivity and specific strength among various metallic materials. Twin roll strip casting process is considered to produce the high quality and low manufacturing cost aluminum alloy fin stock for automobile heat exchangers. Thermomechamical treatment has carried out to obtain optimum processes for initial cold rolling, intermediate annealing and final cold rolling, which can meet the requirements for high strength and high thermal conductivity after brazing heat treatment. In the present study the suitable thermomechnical treatment and optimum nickel content was suggested to balance the properties of strength, thermal conductivity, brazing behaviour, corrosion resistance and sagging resistance in Al-ZnMn-Si-Fe-Cu based alloys produced by twin roll strip casting process.

Casting & Solidification 4

Technical Program

WEDNESDAY AM

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc.

66

Wednesday AM June 6, 2012

Room: Rangos I Location: University Student Center

Session Chair: David Gildemeister, Alcoa Technical Center 9:15 AM Invited Microstructure Development and Control in Hypereutectic Cast Al-Si Alloy Evaluated by Metallurgical Analysis and Neutron Diffraction: Wojciech Kasprzak1; Dimitry Sediako2; Hirotaka Kurita3; 1Natural Resources Canada; 2National Research Council; 3Yamaha Motor Co. Ltd. Hypereutectic Al-Si alloys containing up to 16-20% Si are extensively used in automotive industry. Despite the extensive research carried out in the past there are still aspects of microstructure and mechanical properties development that require in-depth understanding of microstructure control during actual casting operation. Presented results show individual effect of key alloying elements, i.e., Cu, Mg and P on the as-cast microstructure development using classical metallurgical analysis as well as in-situ neutron diffraction during alloy solidification process. Si atoms clustering above liquidus temperature and pre-mature nucleation of a-Al dendrites above liqudus temperature are discussed in addition to liquid-to-solid phase transformation assessment during alloy solidification process. Mechanical strength improvement due to Cu, Mg and P additions are evaluated and linked with microstructure evolution under non-equilibrium solidification conditions. The effect of key casting process parameters are quantified and discussed based on comparative analysis between laboratory test coupons and actual production castings. 9:55 AM Break 10:25 AM Semi-Solid Forming of A356 Al Alloy by Rapid Slurry Forming Process: Sumit Sharma1; Ashok Sharma1; Subodh Kumar2; 1Malviya National Institute of Technology; 2Indian Institute of Science Rapid Slurry Forming (RSF) is a relatively new technique of semi-solid forming. RSF process has been used for A356, A356+Ti+B (grain refiner) and A356+Ti+B+Sr (grain refiner and modifier) Al alloys in the present investigation. All the three alloys were held at about 870 K, at which about 30% solid fraction is obtained in the semi-solid slurry, for 0, 5, 10 and 15 minutes. At each holding time, two portions of slurry were taken out: one

portion was quenched in water to preserve the semi-solid microstructure and the second portion was poured into a die and compressed to simulate die casting. Microstructure of all the three alloys at each stage was examined and hardness was measured. A globular microstructure and higher hardness values have been achieved for the RSF-processed alloys. The coarsening kinetics of the globular alpha phase is found to be faster than that predicted by the LSW-theory. 10:45 AM Assessment of the Al–Ni–Mn–Fe–Si–Zr Phase Diagram for NewGeneration Heat-Resistant Casting Aluminum Alloys: Nikolay Belov1; Alexander Alabin2; 1National University of Science and Technology “MISIS” ; 2National University of Science and Technology “MISIS” The phase composition of the Al–Ni–Mn–Fe–Si–Zr system was analyzed with respect to new-generation heat resistant casting aluminum alloys based on a Ni-containing eutectic. The presence of iron and silicon significantly complicates the phase composition as compared with quaternary (Al–Ni– Mn–Zr) alloys. The admissible concentration of iron, at which no primary aluminides form and a high dispersivity of the eutectic is provided for, went up (to approximately 0.5–0.7%) as the concentration of nickel was decreased from 4 to 2%. Herewith, the solidification range did not exceed 10°C, which enabled higher casting properties. Silicon strongly expands the solidification range (being ~60°C already at 0.1%), which increases the aptitude of the alloy to form hot cracks in castings. Besides, silicon decreases the solubility of zirconium in aluminum solid solution, which decreases the strengthening potential of Al3Zr nanoparticles. 11:05 AM Influence of the Fe Content, Mn/Fe Ratio and Cooling Rate on the Modification Process of Fe Intermetallic Compounds in Hypoeutectic Al-Si Alloys: Zhijun Zhang1; Equo Kobayashi1; Hiroyasu Tezuka1; Tatsuo Sato1; 1Tokyo Institute of Technology The platelet \946 intermetallic compound has been considered as the most common and detrimental Fe compounds in cast aluminum alloys with impurity Fe. This compound drastically deteriorates the mechanical properties of the alloys, especially ductility. It is required to modify the \946 compound to other less harmful Fe compounds. This study mainly focused on the influence of the Fe content, Mn/Fe ratio and cooling rate on the modification process of Fe compounds in the cast A356 alloy with different Fe contents from 1.0 wt.% to 2.5 wt.%. The results revealed that with increasing the Fe content in the alloy without Mn addition, the size of the platelet \946 compound increases significantly. The Mn addition was effective to modify the platelet \946 compound to more compact compounds, Chinese script and/or star-like even the polyhedral shape \945 compound, which mainly depends on the Mn/Fe ratio and the cooling rate in a given Fe level.

Corrosion 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Rudi Buchheit, Ohio State University; Jim Moran, Alcoa Inc. Wednesday AM June 6, 2012

Room: McKenna/Peter Location: University Student Center

Session Chair: James Moran, Alcoa 9:15 AM Invited Defining the Property Space and the Role of Basic Microstructure and Chemistry on Corrosion: Rudolph Buchheit1; N.L. Sukiman2; N. Birbilis2; 1The Ohio State University; 2Monash University In this work, we closely survey the corrosion behaviour of several

commercially available aluminium alloys in 0.1 M NaCl solution. The corrosion rates for these alloys were determined by a battery of tests including potentiodynamic polarisation, electrochemical impedance spectroscopy and weight loss. This allowed for the ability to carefully rank the performance of different alloys with higher fidelity than what is available in the literature. The results obtained from these tests were then compared to the alloys mechanical strength to establish a relationship that we define as a ‘corrosion map’ of the icorr vs syield (or icorr vs HVN) property space. Rationalisation of this relationship is heavily dependant on alloy chemistry and microstructure. Sensitivity analysis was able to reveal some important insights into the role of alloying elements upon corrosion and contribute to a deeper understanding of Al-alloys in general. In parallel, microstructures and damage accumulation were thoroughly characterised by electron microscopy and profilometery to determine the form and intensity of the localised attack. The correlations observed typify the behaviour of aluminium alloys, and can be integrated into a neural network model to predict the corrosion characteristics of Al-alloys as a function of composition / microstructure. 9:55 AM Break

11:25 AM Effect of Three-Dimensional Grain Boundary Structure, Crystallography and Chemistry on Sensitization in Al-Mg Alloys: Keith Knipling1; Alexis Lewis1; 1Naval Research Laboratory Aluminum-magnesium (5xxx series) alloys are widely used in Naval applications requiring lightweight, high-strength, formable, corrosionresistant structural materials. These alloys, however, become susceptible to intergranular corrosion and stress corrosion cracking when exposed to elevated temperatures (70-200°C) This sensitization of the grain boundaries has been attributed to elemental segregation and grainboundary precipitation of the ß phase, Al3Mg2. To date, most research has focused on the effects of bulk alloy composition and annealing treatment on grain-boundary ß precipitation. However, the nucleation and growth of grain-boundary ß is also strongly influenced by the grain boundary character, with both misorientation and inclination influencing the precipitate nucleation rate and precipitate morphology. This study seeks to quantify the relationship between the complex polycrystalline grain boundary character and ß precipitate formation in AA5083, using 3D characterization techniques to understand and quantify the complex relationship of grain boundary microstructure, crystallography, and chemistry to the resulting sensitization behavior.

11:05 AM Precipitation of the ß-phase and Corrosion Behavior of an Al-6.8 wt.% Mg Alloy: Miljana Popovic1; Tamara Radetic2; Endre Romhanji1; 1 University of Belgrade, Faculty of Technology & Metallurgy; 2University of Belgrade, Faculty of Tecnology & Metallurgy; NCEM LBL, Berkeley, USA

13th International Conference on Aluminum Alloys

Technical Program

10:45 AM Quantification of Intergranular Corrosion Susceptibility Dependence on Sample Orientation in Aluminum Alloy 5083-H131: Trevor Hunt1; Amy Laspe1; Young-Ki Yang1; Todd Allen1; 1University of Wisconsin ASTM G-67 is the standard test method for determining the susceptibility to intergranular corrosion (IGC) of 5xxx series aluminum alloys and requires measuring mass loss after exposure to nitric acid (the nitric acid mass loss test, NAMLT). It is known that this mass loss, and thus the IGC susceptibility, is dependent on orientation of the as-manufactured bulk, but the degree of this dependency has not been well-studied or documented. This research quantitatively addresses the orientation dependence of IGC susceptibility for AA5083-H131. Three different sets of rectangular test specimens were prepared; each set has a larger fraction of its total surface area corresponding to one of the manufacturing-induced orientations. These samples were then sensitized at 120°C for 300 hours prior to NAMLT exposure. The resulting IGC susceptibility was then correlated to the microstructure of the alloy to explain the reason for the strong orientation dependence.

WEDNESDAY AM

10:25 AM Influence of Magnesium Content and Heat Treatment on the Intergranular Corrosion OF 5083 Alloy H321 and H116 Temper: Mihaela Aurora Pana1; Petru Moldovan1; Carmen Nicoleta Stanica2; Iulian Vasile Antoniac1; 1Universitatea Politehnica din Bucuresti; 2VIMETCO ALRO SLATINA The 5083 alloy H321 and H116 temper is one of the most common alloy used in marine environments due to intergranular corrosion resistence in seawater. Influence of Mg content and heat treatment on intergranular corrosion was studied by ASTM G67 Standard Test-Nitric Acid Mass Loss Test (NAMLT), optical microscopy (OM), scanning electron microscopy (SEM) and energy-dispersive X-ray analysis. When the local concentration of Mg is high enough, ß phase (Al3Mg2) forms in order to lower the stored energy in the material. The ß phase is anodic to the matrix of alloy in seawater and the potential difference provides the driving force for dissolution of the ß from the grain boundaries causing intergranular corrosion (IGC).

This study was performed on the Al-Mg alloy with the chemical composition: Al-Mg6.8-Mn0.51-Fe0.2-Si0.1. As-received cold rolled material (O-temper) was subjected to (i) cold rolling and annealing at 265°C and 320°C, followed by (ii) sensitization treatment at 100°C. Microstructure evolution during annealing and sensitization, with a focus on the ß-phase formation, was followed by electrical resistivity measurements, optical, SEM and TEM microscopy. It was found that the preferential sites for ß-phase precipitation were grain boundaries and preexisting Mn-rich particles. The annealing temperature had significant effect on the ß-phase morphology: microstructure of sensitized specimens annealed at 265°C was characterized by formation of discontinuous particles, while annealing at 320°C resulted in the formation of the thin film at grain boundaries. Presence of the thin film induced corrosion resistance degradation and also affected grain boundary morphology: initially smooth, curved grain boundaries became strongly faceted.

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Fatigue and Fracture Toughness 3

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Krishnan Sankaran, Boeing; HJ Schmidt, AeroStruc Wednesday AM June 6, 2012

Room: Rangos III Location: University Student Center

Technical Program

WEDNESDAY AM

Session Chair: Robert Bucci, Alcoa Technical Center

68

9:15 AM Origin of Ductile Fracture in Aluminum Alloys: Hiroyuki Toda1; Hideyuki Oogo1; Hideki Tsuruta1; Keitaro Horikawa2; Kentaro Uesugi3; Akihisa Takeuchi4; Yoshio Suzuki4; Masakazu Kobayashi1; 1Toyohashi University of Technology; 2Osaka University; 3Japan Synchrotron Radiation Research Institute; 4Japan Synchrotron Radiation Research Institute It has generally been assumed that metallic materials usually fail as a result of microvoid nucleation induced by particle fracture. Here we concentrate on high-density micropores filled with supersaturated gas, whose existence has been largely overlooked until quite recently. X-ray microtomography was used to observe hydrogen micro pores and their growth and coalescence behaviors during loading, together with particles damage. These pre-existing micropores exhibit premature growth under external loading, thereby inducing ductile fracture, whereas the particle fracture mechanism operates only incidentally. According to the estimation on the areal fraction of dimple patterns originating from the pre-existing hydrogen micro pores, it has been concluded that the hydrogen micro pores make significant contributions to ordinary ductile fracture. Conclusive evidence of a micropore rupture is the observation of an instantaneous release of gas. We can conclude that the growth of pre-existing micropores dominates ductile fracture. 9:35 AM Threshold Stress of A3003 Alloy: Makoto Ando1; Yoshikazu Suzuki1; Goroh Itoh2; 1Furukawa-sky Aluminum Corp.; 2Ibaraki University The threshold stress of the commercially available A3003 alloy, which is a widely used material for the brazing sheets of heat exchangers, was investigated. The plates of the A3003 alloy were subjected to hightemperature tensile testing and creep testing at temperatures of 160, 200, and 240 째C, and the threshold stress at each of these temperatures was evaluated. The evaluation results indicated that the threshold stress, which was standardized by the testing temperature, was approximately 10% higher than the Orowan stress, which was calculated from the dispersion density. A subsequent creep testing experiment was conducted at 200째C using the binary solid-solution Al-0.6%Mn alloy; the result indicated the presence of threshold stress, despite the absence of dispersed particles in the alloy. From these results, it was found that the solid solution of Mn enhanced the threshold stress of the A3003 alloy. 9:55 AM Break 10:25 AM Ultrasonic Fatigue of SiC Particle Reinforced Aluminum in the VHCF Regime: Guntram Wagner1; Dietmar Eifler1; Matthias Wolf1; 1University of Kaiserslautern At the WKK ultrasonic testing systems are used to perform fatigue experiments in the VHCF regime with a frequency of 20 kHz. These systems allow an on-line characterization of the actual fatigue state by changes of different process parameters such as generator power, temperature or frequency-response characteristic. Moreover the experiments can be interrupted in order to investigate changes in the electrical resistance of the specimens. The fatigue tests are realized as load increase tests as well

as constant amplitude tests. The investigated MMC was an AlCu4Mg1 (AA 2124) matrix alloy reinforced with 25 vol. % SiC particles with an average diameter of 0.7 microns. An adequate geometry of the ultrasonic fatigue specimens was found by FE-simulations using ABAQUS CAE. The microstructure of the MMC and the AA 2124 matrix material were described by SEM images and EDX analysis. The monotonic properties were determined and additional hardness measurements were carried out. 10:45 AM Influence of Strain Hardening on Rheological Properties of AlMgSi Wires: Beata Smyrak1; Tadeusz Knych1; Kinga Korzen1; 1AGH University of Science and Technology Elimination of inactive rheologically supporting steel cores in overhead line conductors and replacing them with highly resistant AlMgSi alloy conductors is forced by the need to constantly increase current-carrying capacity of power lines. This solution incorporates a series of potential benefits (lower weight of conductors, ease of assembly, no corrosive contact with the steel core, favorable resistance). However, removing the steel core may result in rheological lengthening of a conductor, an in effect lowering of the tension stress and increasing sag. The article contains experimental test results of low-temperature creep and stress relaxation of various diameter wires made of AlMgSi (6201) and analysis of influence of strain hardening on wire rheological behavior. 11:05 AM On the Effect of Pre-Strain and Strain-Path Changes on Void Growth and Linkage in AA5052 Model Materials: Yaser Alinaqian1; Mahyar Asadi1; Arnaud Weck1; 1University of Ottawa Many aluminum forming processes involve multiple-stage forming operations (also called strain path changes) which means that the material is strained in different directions in order to obtain the final shape. Predicting the formability of parts undergoing such multi-stage forming operations is difficult due to a lack of quantitative information on this process in the literature. We report here on the effect of pre-strain and strain path changes on deformation and fracture in AA5052. Quantitative information is obtained using digital image correlation to extract local strain fields as samples deform. In order to better understand how the fracture process is affected by pre-strain and strain path changes, model materials containing fine laser drilled holes were pre-strained in tension and subsequently fractured in tension in the orthogonal direction. The effect of pre-strain and strain path changes on hole growth and linkage was followed in-situ and compared with analytical and finite element models. 11:25 AM A 3-D Quantitative Crystallographic Model for Short Fatigue Crack Propagation through Grain Boundaries in High Strength Al Alloys: Wei Wen1; A.H.W. Ngan2; Tongguang Zhai1; 1University of Kentucky; 2 The University of Hong Kong A microstructurally-based 3-D model for short fatigue crack (SFC) propagation through grain boundaries (GBs) was developed, based on the early discovery that the twist component (a) of crack plane deflection across a GB was the key factors controlling the crack growth in high strength Al alloys. This model was validated by crack growth experiments in which micro-cracks were made with FIB ahead of the GBs that had a wide range of a. The interactions of these micro-cracks with the GBs were investigated, demonstrating that the GB resistance followed a Weibulltype function of a. By taking into account both the driving force and the resistance of the GB, the growth behavior of a SFC in 3-D in an Al-Li 8090 was simulated. The results were consistent with the experimental observation and the characteristics of SFC growth, such as the scattering in growth rate and irregular shape of SFCs, could be explained.

Carnegie Mellon University; 2NIST Constitutive equations for the multiaxial stress-strain behavior of aluminum alloy 5754 sheets have been developed that are based on crystal plasticity. A Taylor-based polycrystal plasticity model (LApp), a self-consistent viscoplastic model (VPSC) and an N-site model based on the Fast Fourier Transform (FFT) were used to fit a single slip system hardening law to the available data for tension, plane strain and biaxial stretching. The fitting procedure yields good agreement with the monotonic stress-strain data, with similar parameter values for each model. Stress-strain behavior was also measured for sheet specimens of aluminum alloy 5754, deformed along a series of bi-linear, equal-biaxial and uniaxial strain paths, with strain path changes. It was found that including latent hardening between slip planes was needed to explain the decrease in flow stress when changing from equal-biaxial to uniaxial deformation. Followup experiments showed that this was a consequence of room temperature recovery between testing stages. 1

Forming and Joining Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Wednesday AM June 6, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: Kaan Inal, University of Waterloo 8:15 AM Keynote Meeting Vehicle Lightweighting Challenges with Aluminum: Anil Sachdev1; Raja Mishra; Anirban Mahato2; Ahmet Alpas3; 1GM; 2Purdue University; 3University of Windsor Rising energy costs are driving stringent requirements for fuel economy of future automobiles, while consumer demands are centered on enhanced comfort, performance and safety. These conflicting situations offer challenges for vehicle lightweighting, for which aluminum applications are key. This talk will describe product design needs and materials and process developments driven by theoretical, experimental and modeling tools in the area of sheet and castings. Computational tools and novel experimental techniques used in their development will be described. The talk will conclude with challenges that lie ahead for pervasive use of aluminum and the necessary fundamental R&D that is still needed.

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Wednesday AM June 6, 2012

Room: Rangos II Location: University Student Center

Session Chair: Juergen Hirsch, Hydro Aluminium Rolled Products GmbH

10:45 AM Numerical Analysis of Surface Roughening and Necking in Aluminum Alloy Tubes Under Internal Pressure: Yihai Shi1; Peidong Wu2; David Lloyd1; 1Novelis Global Technology Centre; 2McMaster University The finite element method is used to numerically simulate surface roughening and localized necking in aluminum alloy tube under internal pressure. The measured electron backscatter diffraction (EBSD) data are directly incorporated into the finite element model and the constitutive response at an integration point is described by the single crystal plasticity theory. Localized necking is assumed to be associated with surface instability, the onset of unstable thinning. The effects of spatial grain orientation distribution, material strain rate sensitivity, work hardening, and initial surface topography on surface roughening and necking are discussed. It is found that localized necking depends strongly on both the initial texture and its spatial orientation distribution. It is also revealed that the initial surface topography has a negligible effect on necking.

9:35 AM Crystal Plasticity Analysis of Constitutive Behavior of 5754 Aluminum Sheet: Lin Hu1; Anthony Rollett1; Timothy Foecke2; Mark Iadicola2;

13th International Conference on Aluminum Alloys

Technical Program

9:15 AM A New Crystal Plasticity Based Constitutive Model Incorporating Backstress for FCC Polycrystals: Abhijit Brahme1; Raja Mishra2; Kaan Inal1; 1University of Waterloo; 2General Motors Research and Development Center To overcome the current limitations of phenomenological models of predicting material response under complex strain path deformation a new hardening law is proposed. The model is calibrated with experimentally measured microstructural features during deformation. The new hardening law, in contrast to existing laws, can be completely determined from observations with very few free parameters. The model accounts for hardening due to interactions with forest dislocations as well as with dislocation cells. The interaction with dislocation cells is estimated by using backstress effect. The new model is calibrated with experimental uniaxial tension data for the aluminum alloy 5754. The predicted stressstrain curve and microstructural response of the material along various strain paths are compared to experimental measurements. This model allows us to examine the inhomogeneous distribution of slip arising from microstructural features and provides a powerful tool to investigate formability in FCC polycrystals.

10:25 AM Crystal Plasticity Simulation of Deformation Behavior in Polycrystalline Aluminum: LiangXing Lv1; Liang Zhen1; Wenzhu Shao1; 1 Harbin Institute of Technology Plastic heterogeneities of polycrystalline aluminum during different deformation conditions have been numerically investigated at grain level. Responses at several length scales are studied, including the overall stress, texture, intergranular and intragranular stress-strain heterogeneities and dislocation densities. In these simulations a dislocation density based crystal plasticity model was used. The CP model was executed by a user subroutine (UMAT) in ABAQUS. At the first part, we examined the sensitivity of simulation results with respect to mesh refinement. And find that corresponding to the length scale involved, different requirements on mesh density are required. The more smaller the length scale is, the more finer the mesh must be. However, about 500 grains, and 60 elements (480 integration points) per grain can satisfies most of problems. In the later parts, simulation of plane strain compression and punching are preformed, results gives good agreement with experimental data.

WEDNESDAY AM

Forming and Joining 7

9:55 AM Break

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WEDNESDAY AM

11:05 AM Polycrystal-Plasticity Simulation of Roping in AA6xxx Automotive Sheet Alloys: Olaf Engler1; Carmen Schäfer1; Henk-Jan Brinkman1; 1 Hydro Aluminium Rolled Products GmbH The occurrence of roping in AA6xxx sheet alloys for car body applications is caused by the collective deformation of band-like clusters of grains with similar crystallographic orientation. In this paper large-scale orientation maps obtained by electron back-scattered diffraction (EBSD) are input into a visco-plastic self-consistent polycrystal- plasticity model to analyze the strain anisotropy caused by the topographic arrangement of the recrystallization texture orientations. (i) the local dispersion in strain rate components is analyzed for the EBSD maps obtained in the sheet plane to confirm the effect of orientation clustering on roping; (ii) narrow bands in the EBSD maps acquired from the rolling direction are considered to study the impact of through-thickness texture topography on the macroscopic strain response from band to band. The polycrystalplasticity roping model is applied to two sheets distinguished by different levels of roping. 11:25 AM Properties of Free-Machining Aluminum Alloys at Elevated Temperatures: Jiri Faltus1; Miroslav Karlik2; Petr Hausild2; 1Research Institute for Metals; 2Czech Technical University in Prague In areas close to the cutting tool the workpieces being dry machined could be heated up to 350°C and they may be impact loaded. Therefore it is of interest to study mechanical properties of corresponding materials at elevated temperatures. Free-machining alloys of Al-Cu and Al-MgSi systems containing Pb, Bi and Sn additions (AA2011, AA2111B, AA6262, and AA6023) were subjected to Charpy U notch impact test at the temperatures ranging from 20 to 350°C. The tested alloys show a sharp drop in notch impact strength KU at different temperatures. This drop of KU is caused by liquid metal embrittlement due to the melting of low-melting point dispersed phases which is documented by differential scanning calorimetry. Fracture surfaces of the specimens were observed using a scanning electron microscope. At room temperature, the fractures of all studied alloys exhibited similar ductile dimple fracture micromorphology, at elevated temperatures, numerous secondary intergranular cracks were observed.

ICME Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: John Allison, University of Michigan; George Spanos, The Minerals, Metals & Materials Society Wednesday AM June 6, 2012

Room: Rangos I Location: University Student Center

Technical Program

Session Chair: John Allison, The University of Michigan

70

8:15 AM Keynote Develop ICME Tool for High Ductility Cast Aluminum Alloys for Automotive Body Applications: Mei Li1; J. Zindel1; L. Godlewski1; Xuming Su1; 1Ford Motor Company One heat treatable high ductility Al-Si-Mg alloy was investigated in this study. To achieve the full potential of strength and ductility of this alloy, super vacuum die casting (SVDC) process was used to produce the high integrity Al cast components free of air entrapment. A semi-empirical model based on Shercliff and Ashby’s process model for age hardened Al alloys and experimental data were developed. The model can predict the effect of solidification time, aging temperature and time on yield strength. A quality mapping approach was adopted to predict the local ductility based on the predicted criteria functions from commercial casting simulation

program MAGMAsoftTM and experimental data. A new materials card was then built for crash performance analysis in LS-DYNA which includes the impact of local yield strength and ductility. Finally this ICME tool was validated on component level three-point and four-point bending testings.

ICME 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: John Allison, University of Michigan; George Spanos, The Minerals, Metals & Materials Society Wednesday AM June 6, 2012

Room: Dowd Location: University Student Center

Session Chair: George Spanos, TMS 9:15 AM Utilisation of Atom Probe Data to Model Precipitation and Strengthening in an Al-Mg-Si-Cu Alloy During Natural Ageing and Early-Stage Artificial Ageing: Dacian Tomus1; Paul Rometsch1; Malcolm Couper1; Chris Davies1; Lingfei Cao1; 1Monash University An Al-Mg-Si-Cu alloy was artificially aged for 0.13, 0.5 or 2 hours at 170°C after natural ageing times of 0.03, 3 or 168 hours. Three dimensional atom probe (3DAP) analysis and tensile testing were performed in the artificially aged and naturally aged conditions. The experimental data were used to determine model inputs such as particle size distributions and volume fractions of particles. The principle of the model is to numerically simulate the isothermal transformation of clusters, zones and/or precipitates by dividing the starting particle distribution into a series of discrete size classes and control volumes. Standard physically-based equations are used to simulate particle growth and/or dissolution by adjusting enthalpy, entropy and interfacial energy values to obtain a good fit between model predictions and 3DAP results. The predicted particle size distributions and volume fractions are then used to model yield strengths in a wide range of naturally aged and under-aged conditions. 9:35 AM Ab Initio Simulations of Vacancy-Solute Clusters in Al-Mg-Si and Al-Zn-Mg Alloys: Peter Lang1; Peter Mohn2; Ahmad Falahati2; Ernst Kozeschnik2; 1Materials Center Leoben Forschungs GmbH; 2Vienna University of Technology The coherent fcc (face-centred-cubic) based cluster stability of Al-Mg-Si and Al-Zn-Mg alloys is studied theoretically using augmented plane wave density functional theory calculations of a periodically repeated supercell containing 32 atoms. In particular, the presence of vacancies within the structure of Mga-Sib±Vac and Znd-Mge±Vaf clusters is investigated in detail. These fcc type arrays of solutes are considered to bind with vacancies. The binding energies between two substitutional elements, Mg and Si as well as Zn and Mg, and same arrangements bound to one vacancy in a fcc aluminium matrix are calculated. The binding energies of the coclusters are taken as reference energies to compare the binding energies of two atom co-clusters to a vacancy in different constellations. These energies are used to predict formations of very early clusters containing single vacancies. Energetically more favourable structures are obtained and discussed. 9:55 AM Break 10:25 AM Modeling Precipitation in Al-Mg-Si Alloy – the Effect of Deformation: Ahmad Falahati1; Mathieu Bolez2; Mohammad Ahmadi1; Jun Wu1; Ernst Kozeschnik1; 1Vienna University of Technology; 2Ecole Polytechnique de l’université de Nantes The diffusion kinetics in crystals is governed by the density of vacant

lattice sites as well as the dislocation density. Excess vacancies can be generated by various mechanisms: quenching, irradiation or deformation. Excess dislocations are mainly introduced by deformation. The amount of excess vacancies and its time and temperature-dependent evolution play a fundamental role in the early stages of precipitation. Before partial annihilation of excess vacancies at dislocations, grain boundaries or incoherent phase boundaries, they contribute significantly to diffusional transport even at low temperatures and support rapid precipitation. In the present work, dislocation density and deformation induced vacancies evolution during plastic deformation will be discussed and a model for the generation and annihilation of deformation induced vacancies will be introduced. By implementing the model in the thermo-kinetic simulation software MatCalc, predicted yield strength calculation of combined thermal heat treatment and room temperature deformation will be compared with recent experimental results.

presented. A comparison between single (311) diffraction peak and multiple peaks analysis using Pawley algorithm is shown. The variation of the stress free reference value through the plate thickness is discussed and measured stresses are compared with residual stresses predicted by a thermomechanical finite element model of quenching.

10:45 AM Modeling the Precipitation Behavior of Semi-Stoichiometric Dispersoids in 3xxxx Aluminium Alloys: Yanjun Li1; Arild Håkonsen2; Dag Mortensen3; Trond Furu4; 1SINTEF Materials and Chemistry; 2Hydro Aluminium, Hycast; 3Institute for Energy Technology; 4Hydro Aluminium, RTD A microstructure model used for simulating the microstructure evolution in AA 3xxx alloys during homogenization is presented. By this model, the evolution of the size, number density and global distribution of semi-stoichiometric dispersoids and the change of solid solution level of alloying elements can be well predicted. The simulation results have been compared to experimental results.

Session Chair: William Cassada, Alcoa Technical Center

Wednesday AM June 6, 2012

Room: Connan Location: University Student Center

9:15 AM Invited Precipitation in Al-Cu-Li Alloys: from the Kinetics of T1 Phase Precipitation to Microstructure Development in Friction Stir Welds: Alexis Deschamps1; Frédéric De Geuser2; Benoît Malard1; 1Grenoble Institute of Technology; 2SIMAP - CNRS Al-Cu-Li based alloys are experiencing a rapid development for aerospace applications. The main hardening phase of this system (T1Al2CuLi) forms as thin platelets (1 nm) that can reach diameters of 100 nm with remarkable stability in temperature. The nucleation, growth and thickening mechanisms of this phase are still ill understood and are of crucial importance for the understanding of the microstructures resulting from simple to complex thermo-mechanical treatments, including friction stir welding of such alloys.In this contribution, we will first present insitu synchrotron small angle scattering X-ray experiments that enable to better understand the precipitation kinetics and morphology evolution of T1 precipitates. In a second part, this knowledge will be applied to the understanding of the development of FSW microstructures in the as welded condition and after post-welding heat treatments by coupling X-ray microstructural mapping of the weld cross sections with TEM and DSC measurements. 9:55 AM Break 10:25 AM Phase Coarsening in Al-Li Binary Alloys: Martin Glicksman1; Ke-Gang Wang Wang1; Ben Pletcher2; 1Florida Institute of Technology; 2Chicago Bridge and Iron Experimental characterization of microstructure evolution in three binary Al-Li alloys provides a quantitative test of diffusion screening theory, a many-body theory for phase coarsening. Particle size distributions, growth kinetics, and maximum particle sizes were obtained through precision aging experiments. Microstructures consisted of spherical d-prime precipitates distributed through the AL-Li solid solution matrix, which evolved after nucleation over the size range 20-200 nm. Quantitative, centered dark-field TEM images, post-processed through specialized software, were used to measure the size and centroid locations of 10,000 particles per alloy. The dependence on the volume fraction of d-prime for the coarsening rate constant, and maximum particle size were each determined accurately. Both of these measures have eluded accurate prediction using conventional coarsening theory for nearly a half century. These experiments show that the modern diffusion-screening description of late-stage phase coarsening yields accurate kinetic predictions, and a deeper understanding of microstructure evolution in two-phase alloys.

13th International Conference on Aluminum Alloys

Technical Program

11:25 AM Residual Stress Analysis in AA7449 As-Quenched Thick Plates Using Neutrons and Fe Modelling: Nicolas Chobaut1; Julia Repper2; Thilo Pirling3; Denis Carron4; Jean-Marie Drezet1; 1EPF Lausanne; 2 Paul Scherrer Institut; 3Institut Laue-Langevin; 4LIMatB, Université de Bretagne-Sud In the current trend toward thicker aluminium plates, a major concern is the generation of high internal stresses during quenching, which can cause distortions during machining and pose serious safety concerns. Although the material is stretched after quench, substantially reducing residual stresses, they are not fully suppressed. In addition, the cooling rate is not large enough at the core of such thick plates to prevent any precipitation. This has a great impact on the efficiency of ageing. In this work, residual stress distributions in a heat-treatable aluminium alloy AA7449 thick plate in the as-quenched state measured by neutron diffraction are

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Gary Shiflet, University of Virginia; Dave Laughlin, Carnegie Mellon University

WEDNESDAY AM

11:05 AM The Role of the Si Network to the Stabilization of Hardening Precipitates in the Al-Mg-Si(-Cu) Alloy System: Flemming Ehlers1; Sigurd Wenner1; Sigmund Andersen2; Calin Marioara2; Randi Holmestad1; 1 Norwegian University of Science and Technology, NTNU; 2SINTEF Al-Mg-Si(-Cu) alloys are an important group of age hardening materials and possess some of the more complex precipitation sequences: In AlMg-Si, none of the metastable hardening precipitates can be described as weakly distorted versions of equilibrium phases, while in Al-Mg-Si-Cu, one of the main hardening precipitates is not associated with a unit cell. For both sequences, however, more than a decade of experimental work has revealed that a Si substructure with projected hexagonal symmetry when viewed in precipitate main growth axis projection is shared among all metastable phases. The present talk seeks to clarify theoretically the significance of the Si network to phase stabilization while also quantifying the level of similarities among the various phases possessing this structure. Based on these results, very clear suggestions for a common precipitate nucleation mechanism emerge.

Phase Transformations 4

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Technical Program

WEDNESDAY AM

10:45 AM Quantitative Description of the T1 Morphology and Strengthening Mechanisms in an Age-hardenable Al-Li-Cu Alloy: Thomas Dorin1; Alexis Dechamps2; Frédéric De Geuser2; Matthew Weyland3; 1Constellium CRV and SIMAP; 2SIMAP; 3Monash Centre for Electron Microscopy, Department of Materials Engineering In the Al-Cu-Li system, the main strengthening precipitate is the T1 phase (Al2CuLi). Although it has long been recognized that this phase is shearable, a clear picture of the strengthening mechanism associated with the formation of this phase is not currently available, since the available strengthening models consider this phase as non-shearable. We present a detailed investigation of the shearing of T1 precipitates in an AIRWARETM AA2198 alloy using High Angle Annular Dark Field (HAADF) imaging in an atomic resolution Scanning Transmission Electron Microscope (STEM). The atomic scale imaging of the precipitates makes it possible to quantify the density of shearing events, which turns out to be insufficient to account for the imposed plastic strain. We discuss the implications of this result in terms of precipitate-dislocation interactions in the framework of a broad study on the precipitation kinetics in this alloy and related strength increment.

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11:05 AM Orientation Relationship of Dispersoids Precipitated in an AA3xxx Alloying during Annealing at Low Temperatures: Astrid Marie Muggerud1; Yanjun Li2; Randi Holmestad1; 1Norwegian University of Science and Technology, NTNU; 2SINTEF Materials and Chemistry A better understanding of the precipitation behaviour during homogenization of non heat treatable 3xxx alloys is essential to optimize the chemical composition and homogenisation process in these alloys. The type, size and distribution of α-Al(Mn,Fe)Si dispersoids have strong influences on the deformation behaviour and properties of the 3xxx alloys. In this study four DC-cast 3xxx alloys with different Mn and Si concentrations have been isothermally annealed at different temperatures in the range of 350°C to 450°C with different holding times. A systematic study of the precipitation behaviour for the wrought 3xxx alloys has been performed. Orientation relationships between the Aluminium matrix and the dispersoids as well as the habit planes of dispersoids have been determined by TEM. The so-called “O-lattice theory”, has been used to analyse the orientation relationships, the habit planes and the morphology evolution of the dispersoids. 11:25 AM Hf-Containing Precipitates in Al-Si-Mg-Hf Alloy during Heat Treatments at 400oC-560oC: Zhihong Jia1; Zhijie Chen1; Lars Arnberg2; Petter Asholt3; Qing Liu1; Guangjie Huang1; 1Chongqing University; 2 Norwegian University of Science and Technology; 3Hydro Aluminium Hf-containing precipitates with nanobelt-like morphology were found in Al-Si-Mg-Hf-Y alloy in the previous work, however, the precipitation behaviour of such precipitate was not understood completely. In the present work, an Al-Si-Mg-Hf alloy was cast and subsequently heat treated in the temperature range 400-560oC, in order to investigate the evolution of Hfcontaining precipitates. It was found that the heat treatment temperature is a critical factor on the formation and type of the Hf-containing precipitates. Heat treatment temperatures in the range 400 to 475oC resulted in elongated Al-Hf precipitates for a holding time up to 45 h while temperature above 500oC resulted in Si2Hf nanobelt-like precipitates. A heat treatment temperature of 560oC gave a high density of belt-like precipitates with large aspect ratio.

TMP 4

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Wednesday AM June 6, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: Jozef Zrnik, Comtes FHT, Inc. 9:15 AM A Study of the Influence of Plastic Pre Strain in Different Directions before Aging of Extruded and Hydro Formed Material on the Mechanical Properties of AA6063: Sten Johansson1; Jan Kanesund1; 1 Linköping University Alloys from the 6xxx series are often candidates in materials selection made by car industry due to their good formability and response to age hardening. In this study 6063 was subjected to experiments were the influence of plastic deformation on the age hardening response and mechanical properties was investigated. Extruded and naturally aged material, was plastically deformed to different strain in one or two directions and subsequently aged at two temperatures (160 and 185°C). The technique Hydro forming was also used to induce plastic deformation on tubes. The aged material was then tensile tested and microstructural studies using TEM were made. The results presented as stress strain curves, aging curves and TEM micrographs were discussed and the main conclusion is that the time to peak strength is more affected by plastic deformation than the final strength of 6063. 9:35 AM The Effects of Transition Elements on the Control of Recrystallization of Al-Zn-Mg Extrusion: Yukimasa Miyata1; Shinji Yoshihara1; 1KOBE STEEL, LTD. In many case, surface recrystallization occurs in aluminum extrusion. In the case of Al-Zn-Mg alloy, coarsening of surface recrystallization lower its resistance for stress corrosion cracking (SCC). Therefore, surface recrystallization grains need to be fined, then transition elements (manganese, chromium and zirconium for common industrial products) are added to prevent surface recrystallization from coarsening. These transition elements added in aluminum become fine dispersoids by homogenization treatment and pin the migration of the boundary of recrystallization grain. On the other hand, these dispersoids sometimes sharpen its quench sensitivity and lower its strength because the interface between these dispersoids and matrix can be the site for nucleation of precipitate (MgZn2) during quenching. We have investigated the composition of these dispersiods and their effects on the control of recrystallization to research optimum addition of transition elements to satisfy both of fined recrystallization grains and strength. 9:55 AM Break 10:25 AM Characterization of the Artificial Aging Behavior and Formability of a High Strength EN AW-6016 at Different Heat Treatment Conditions Used for Automotive Applications: Ramona Prillhofer1; Josef Berneder1; Dirk Uffelmann1; Peter Schulz1; Carsten Melzer2; 1AMAG Rolling GmbH; 2 AMAG Metall GmbH (AMAG) The growing demand for more fuel-efficient vehicles has led to a demand for sheets with higher strength accompanied by good formability to achieve a further weight reduction in cars. The purpose of this work is to investigate an alloy based on the EN AW-6016 composition which shows both, higher strength and improved formability. Within the present investigation the (I) influence of the main alloying elements of EN AW-6016 on the T4 strength

and formability is described. Furthermore an (II) improved heat treatment cycle with the objective to increase both strength and formability is presented. The hereby produced T4 temper is (III) analyzed in comparison to standard T4 and other high strength Cu-containing 6xxx alloys in terms of artificial aging kinetics by using differential scanning calorimeter (DSC). Finally the (IV) effect of the improved mechanical properties on the forming performance is investigated in detail. 10:45 AM Low Work Hardening And Its Mitigation In Ultra-Fine Grained Al Alloys: Haiou Jin1; Mark Gallerneault1; David Lloyd1; 1Novelis Inc Ultra-fine grained Al alloys can achieve high strengths but their ductility and formability is limited by a low work hardening rate. In this paper the factors contributing to the work hardening behavior are examined in a 5000 series alloy. It is suggested that the low work hardening rate can be attributed to two factors: (1) The influence of inhomogeneous yielding, which seems to be a characteristic of ultra-fine grained alloys and (2) a reduced work hardening rate during homogeneous flow. Methods of improving the work hardening rate are then considered in the context of these two factors and the improvement in the work hardening and elongation reported.

Wednesday AM June 6, 2012

Room: Wright Location: University Student Center

Session Chair: Warren Poole, The University of British Columbia 9:15 AM A Study of the Influence of Strain Hardening and Precipitation Hardening Sequence on Mechanical Properties of AlMgSi Conductor Alloys: Beata Smyrak1; Tadeusz Knych1; Andrzej Mamala1; Kinga Korzen1; Piotr Osuch1; 1AGH - University of Science and Technology Precipitation-hardenable AlMgSi alloys grade 6101 of 0.5% Mg and 0.5% Si contents, are used for the construction of homogenous wires in overhead power lines. The dominating group of alloys with increased electrical conductivity is the AlMgSi alloy group, these are HC, EHC and EEHC type materials with tensile strength at approximately 300 MPa and electrical conductivity lower than conventional wires (56,5 - 54,3 %IACS). The study presents the results of the research of AlMgSi wires heat treatment in compliance with the PN-EN 50183 standard. The shaping of heat treatable AlMgSi alloy rods and wires properties is possible through an appropriate sequence of a precipitation hardening (during ageing) and strain hardening (during drawing processes). This paper is a comprehensive analysis of the technologies for the production of wires from AlMgSi alloys. 9:35 AM Behaviors of 7055 Aluminum Alloy in Retrogression and Re-Aging Treatment: Nie Baohua1; Liu Peiying2; Zhou Tietao2; 1BeiHang university; 2BeiHang University Behaviors of 7055 aluminum alloy in retrogression and re-aging (RRA) treatment were investigated by hardness, electrical conductivity, DSC and TEM testing. It was noticed that electrical conductivity of the alloy is subjected to the supersaturation degree of matrix with solute atoms, which indicates that electrical conductivity may not be an effective factor to evaluate the stress corrosion cracking (SCC) resistance of 7000 series aluminum alloys for RRA treatments as it is used for their simple aging process. It was found that the peak hardness of the alloy after RRA keeps almost constant for different retrogression temperature if the error of hardness test ignored, and the retrogression time corresponding to the peak aging hardness will shift from the valley towards upwards part of retrogression curve. Discussion of experimental results will be made in the paper on the basis of strengthening mechanism and kinetics of retrogression and re-aging.

13th International Conference on Aluminum Alloys

Technical Program

11:25 AM Mechanical Properties of Multilayer 1100/7075 Aluminum Sheet Produced by Hot ARB: Kawunga Nyirenda1; Zejun Chen1; Quanzhong Chen1; Qing Liu1; 1Chongqing University The five layer aluminum sheet had been processed by alternation 7075 and 1100 purity aluminium sheets of controlled volume fraction at high temperature using the ARB technique. This work established that hot roll bonding of high strength 7075 aluminum alloy is perfect when rolled with pure aluminum. The rolling work was done at the solution temperature of the 7075. The strength and elongation of the roll bonded material was found to be better than the initial five layer clad sheet. In the fifth cycle of ARB, the yield strength for the same temper was 21 and 11% higher than the clad sheet in F and T6 temper, while the UTS in the F and T6 tempers was 26 and 11.5% higher. Elongation, which is a property of toughness also increased up to the fifth cycle were it began to level down to values equal or less than the preceding cycle.

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc.

WEDNESDAY AM

11:05 AM The Influence of Initial Microstructure on the Recrystallization Behaviour of Cold-rolled AA3003: Payman Babaghorbani1; Warren Poole1; Mary Wells2; Nick Parson3; 1University of British Columbia; 2 University of Waterloo; 3Rio Tinto Alcan Due to an excellent combination of strength, formability, corrosion resistance and material cost, extruded Al-Mn alloys (e.g. AA3003) are widely used in heat exchanger applications for automotive, off road and now HVAC applications. Grain size control is essential, as it affects important properties such as corrosion resistance, strength and formability. The present work describes experimental observations on the microstructure resulting from different homogenization practices of AA3003 which modify the dispersoid distribution and the initial grain size. This work considers deformation by cold rolling to reductions of 1080 pct followed by annealing at the temperature range of 350 to 600 째C. Preliminary results show that there is a critical temperature below which concurrent precipitation of Mn-bearing dispersoids retards recovery and recrystallization giving rise to different recrystallized grain sizes. The effect of initial grain size was observed to be significant when there were almost no dispersoids with cold reductions of 10-20 pct.

TMP 6

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9:55 AM Break

Technical Program

WEDNESDAY PM

10:25 AM Characterization of Pre-Aged AA6061-T6 Sheet Material for Aerospace Applications: Josef Berneder1; Ramona Prillhofer2; Peter Schulz2; Carsten Melzer3; 1AMAG Rolling; 2AMAG Rolling GmbH; 3 Austria Metall GmbH (AMAG) In previous papers it was shown for alloy AA6061 that the artificial aging response is adversely affected by natural aging at room temperature. A suitable pre-aging procedure at elevated temperatures immediately after solution heat treatment is effective in reducing the detrimental effects of natural aging on the artificial aging kinetics. The hereby produced temper T4* shows an increased aging response and exhibits after artificial aging to temper T6 a much higher level of mechanical properties. In the present work pre-aged AA6061 material is produced on industrial scale and is characterized in comparison to a standard production in terms of static and dynamic material properties in the peak aged temper T6. The effects of the pre-aging on artificial aging kinetics and corrosion performance as well the fatigue crack propagation rate and fracture toughness behaviour is presented in detail and the results are discussed in view of application in the aerospace industry.

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10:45 AM Controlled Quenching of Aluminum Alloys in Flexible Spray Fields: Andrea Rose1; Sven Schuettenberg1; Nils Hornig1; Axel von Hehl1; Udo Fritsching1; 1Foundation Institute for Materials Science During heat treatment of age hardenable aluminum alloys the resulting mechanical properties can be particularly influenced by the quenching process. To achieve the required strength, a high cooling rate after solution annealing is necessary, otherwise a homogeneous distribution of quenching intensity should be realized in order to avoid distortion. Controlled quenching within heat treatment process of aluminum components can be realized by flexible nozzle fields. Suitable heat transfer conditions of the component are realized by adjusted flexible flow fields (local and/or temporal) based on simulation of flow field by CFD. By the use of gas-(air), spray-(water/air) or jet-(water) flow fields it is possible to adapt the quenching intensity on component geometry and on load profile influencing mechanical properties as well as distortion after heat treatment. For this purpose a flexible nozzle field quenching process was integrated into heat treatment for age hardening of different wrought-, cast-, and spray-formed aluminum alloys. 11:05 AM Effect of Coarse Particles on Work Hardening in the Al-Mn Alloy: Shingo Iwamura1; Kazuyo Ogawa1; 1Sumitomo Light Metal Industries, LTD. The effects of coarse Al6Mn particles (~3μm) on the formation of deformed microstructure in the Al-0.7mass%Mn binary alloy have been investigated by the tensile test and the microstructure. The coarse particles have less effect on the dislocation migration up to 0.2% deformation. Because of the localization of dislocations around the coarse particles, the maximum n-value appears in the deformation range of 1% to 10%. The dislocation cells are formed in the deformation range of 10% to 30%. In this stage, the incoherent matrix/particle interfaces act as annihilation sites of dislocation and prevent to increase flow stress. In the case of higher deformation, the subgrains with high angle boundary form around the coarse particles. As a consequence of those results, the Mn atoms in the coarse Al6Mn particles have larger effect on work hardening than those in the matrix as solute atoms. 11:25 AM Precipitation Behavior of Dispersoids in Al-Mg-Si-Cu-Mn-Cr Alloy during Homogenization Annealing: Yi Han1; Ke Ma1; Chuyan Wang1; Hiromi Nagaumi1; 1Suzhou Research Institute for Nonferrous Metals The precipitation behavior of dispersoids containing Mn and Cr in Al-

Mg-Si-Cu-Mn-Cr alloy during homogenization annealing with different heating rate was investigated in this paper. Scanning transmission electron microscopy (STEM) was used to measure the difference in the size and number density of dispersoids after the two treatments. The effect of homogenization treatment on the recrystallization fraction and grain size was determined by examining hot forged and solution treated specimens using electron back-scatter diffraction (EBSD). It was found that the slow homogenization heating rate promotes to an increase in the average dispersoid number density and decrease in particle size. The enhanced dispersoids distribution resulting from the slow homogenization heating rate leads to a reduction in the recrystallization fraction (24~29% lower) and grain size (18~22% smaller).

Casting & Solidification 5

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc. Wednesday PM June 6, 2012

Room: Rangos I Location: University Student Center

Session Chair: Wojciech Kasprzak, Natural Resources Canada 2:00 PM Thixoforming of Al-Mg2Si Composite Feedstock Produced by Cooling Slope Casting: Farzin Sahihi1; Ehsan Parshizfard2; Saeed Shabestari3; Hasan Saghafian3; 1MIGT Co.; 2NMI Co.; 3IUST University In-situ Al-Mg2Si composite with semisolid structure was produced through cooling slope casting and reheating process. Cooling slope casting at 700 °C produced fine primary Mg2Si particle and changed coarse dendrite morphology to regular polyhedral shape. Samples obtained from cooling slope casting were heated at 575 °C for 45 minutes. Reheating in semisolid temperature changed a-Al grains and Mg2Si particles to globular morphology. The feedstock obtained from C.S. was reheated in 575 °C and thixoforged using hydraulic press. The thixoforged part of Al-Mg2Si composite was metallurgically sound and free of any porosity. Microstructural evaluation and improved hardness results of the thixoforged composite will be discussed in this paper. 2:20 PM The Influence of Heat Treatment Parameters on the Electrical Conductivity of AlSi7Mg and AlSi10Mg Aluminum Cast Alloys: Piotr Uliasz1; Tadeusz Knych1; Marzena Piwowarska1; Justyna Wiechec1; 1AGH University of Science and Technology Aluminum alloy casts are widely used in industry as part of heat exchangers. In this case, one of the main requirements is the thermal conductivity and mechanical properties of the alloy. According to the Wiedemann–Franz law, the thermal conductivity of the alloy is expressed by means of measurements of the electrical conductivity value. The article presents the results of research of the impact of type and conditions of heat treatment on electrical properties of aluminum casting alloys type 361.0 and 364.0. Aim of the work is to determine the possibilities of obtaining the electrical properties of alloy while maintaining the required level of mechanical properties. Tests include testing the Brinell hardness and electrical conductivity by eddy current method on samples after solution heat treatment and artificial ageing. On the basis of studies ranges of heat treatment were determined which allow to obtain 27.0 MS/m in case of 357.0 alloy and 23.5 MS/m in case of 361.0 alloy. 2:40 PM Effect of Oxide Level on Pore Formation in A356 Alloy by X-Ray Imaging and Direcctional Solidification Technology: Hengcheng Liao1;

Wan Song1; Qigui Wang2; Lei Zhao1; Ran Fan1; 1Southeast University; 2 GM Global Powertrain Engineering Effect of oxide level on pore formation in A356 alloy was investgated by X-ray imaging and directional sloidification technology. Stirring melt, of more importance, increase the amount of more active nucleation sites for pore formation which leads to a remarkable rise of the nucleation temperature of pores. Growth of those prior formed restrain the succeeding nucleation operations in local regions and they have more time to grow to a larger size, thus stirring melt results in a considerable reduction in the pore density, but a remarkable rise in both the pore volume fraction and large pore number. Growth rate of pores decreases with the reduction of local liquid temperature, and stirring melt alters the dependent relationship of the average growth rate of pores on the local temperature. Pore properties are fluctated along the solidification length. Stirring melt completely changes the size distribution profile of pores in the finally solidified specimen. 3:00 PM Break

4:10 PM Production of Single Cylinder Engine Piston through Vacuum Die Casting in Sedi Enugu: Emmanuel Nwonye1; Christian Nwajagu1; 1 Scientific Equipment Development Institute This research work looked into the fundamental properties of molten metal as well as the casting processes, especially the principle of operation of vacuum die casting used in the production of single cylinder engine piston. In addition, the factors that lead to the selection of vacuum die casting method for the project was enumerated. The main structure

Corrosion 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Rudi Buchheit, Ohio State University; Jim Moran, Alcoa Inc. Wednesday PM June 6, 2012

Room: McKenna/Peter Location: University Student Center

Session Chair: Rudolph Buchheit, Ohio State University 2:00 PM Defining the Property Space and the Role of Basic Microstructure and Chemistry on Corrosion: Nick Birbilis1; N. Sukiman1; R. Buchheit2; 1 Monash University; 2The Ohio State University In this work, we closely survey the corrosion behaviour of several commercially available aluminium alloys in 0.1 M NaCl solution. The corrosion rates for these alloys were determined by a battery of tests including potentiodynamic polarisation, electrochemical impedance spectroscopy and weight loss. This allowed for the ability to carefully rank the performance of different alloys with higher fidelity than what is available in the literature. The results obtained from these tests were then compared to the alloys mechanical strength to establish a relationship that we define as a ‘corrosion map’ of the icorr vs óyield (or icorr vs HVN) property space. Rationalisation of this relationship is heavily dependant on alloy chemistry and microstructure. Sensitivity analysis was able to reveal some important insights into the role of alloying elements upon corrosion and contribute to a deeper understanding of Al-alloys in general. In parallel, microstructures and damage accumulation were thoroughly characterised by electron microscopy and profilometery to determine the form and intensity of the localised attack. The correlations observed typify the behaviour of aluminium alloys, and can be integrated into a neural network model to predict the corrosion characteristics of Al-alloys as a function of composition / microstructure.

13th International Conference on Aluminum Alloys

Technical Program

3:50 PM The Effect of Nickel on the Thermal Conductivity of Al-Si Cast Alloys: Florian Stadler1; Helmut Antrekowitsch1; Werner Fragner2; Helmut Kaufmann3; Peter J. Uggowitzer4; 1Montanuniversitaet Leoben; 2AMAG Casting GmbH; 3AMAG Austria Metall AG; 4ETH Zurich In this study we describe the effect of the main alloying elements Ni, Cu and Mg on the thermal conductivity of hypoeutectic and near-eutectic Al-Si foundry alloys. Multicomponent Al-Si alloys can be considered as a coarse two-phase system, which consists of \945-Al matrix and a rigid long-range 3-D network of eutectic Si and aluminides. The grade of contiguity of rigid phases considerably influences the thermal conductivity of the respective alloys. Systematic compositional variations, affecting the volume fraction of eutectic Si and aluminides and hence their contiguity, illustrate the significant sensitivity of the base alloys AlSi7(FeMn) and AlSi12(FeMn) to the concentration and the particular combination of Ni, Cu and Mg. The thermal conductivity data are discussed on a systematic basis of thermodynamic calculations and metallographic investigations and compared to data for the electrical conductivity.

4:30 PM Fatigue Behavior in Rheocast Aluminum 357 Suspension Arms Using the SEED Process: Ehab Samuel1; Chang-Qing Zheng1; Amine Bouaicha2; Mohamed Bouazara3; 1National Research Council Canada; 2Université du Québec à Chicoutimi ; 3Université du Québec à Chicoutimi Extensive studies have been devoted to the use of aluminum alloys in the automotive industry, by virtue of the favourable mechanical properties that can be attained. Moreover, the aluminum casting method employed has also been the subject of scrutiny, given the multitude of casting options available. The present work serves to illustrate the advancements made in the area of rheocasting, using the SEED method, as carried out at the National Research Council Canada – Aluminum Technology Centre. The SEED (Swirled Enthalpy Equilibration Device) process, which relies on heat extraction of the liquid aluminum alloy via mechanical agitation in a confined cylinder to form the semi-solid billet, has already proven successful in producing sound aluminum castings having an excellent combination of strength and ductility. Moreover, fatigue testing on the cast alloy parts has shown enormous potential for this emerging technology.

WEDNESDAY PM

3:30 PM Increased Production and Quality with Reduced Operating Costs and Emissions in Aluminum Melting Using High Temperature Oxygen Analyzers: Yvonne Boltz1; Brien Knight1; 1United Process Controls, MMI Two major types of oxygen analyzers are found in the aluminum industry: extractive and in-situ. Both types work in aluminum applications, but excessive maintenance limits the usefulness and reliability of the extractive units in many applications. Because of high moisture content and particulate in the combustion gas, cells and sample conditioning systems require continuous attention. Regular calibration services and cleaning are required. Using a high temperature in-situ sensor solves these problems. In most cases, high temperature in-situ oxygen sensors do not require pumps, heaters, filter systems, calibration, etc. The sensors are located in the exhaust port or duct. Continuous oxygen monitoring improves efficiency, lowers emissions, provides higher metal yields, better metallurgical results, and improved through-put. While monitoring has its benefits, the true Return on Investment is realized when oxygen is accurately controlled for optimized combustion.

and working principles of vacuum die casting machine was explained. Furthermore, this paper treated mould design and mould materials requirement. And in conclusion, this paper discussed the alloy analysis of aluminum alloys used in the production of the piston. Although all the tests have not been carried out on components to ascertain their strength and durability but a functional test has been carried out by coupling the component on an engine and running same for a while.

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2:40 PM Testing the Corrosion Behavior of Plated Aluminum Strips for Heat Exchangers Operating in the Automotive Industry: Marek Nowak1; Mieczyslaw Opyrchal1; Andrzej Klyszewski1; Janusz Zelechowski1; 1 Institute of Non Ferrous Metals in Gliwice The automotive industry uses heat exchangers made of aluminium alloys. The radiators for an engine cooling system comprise elements (tubes) in which the coolant flows. These elements are made of AlMn alloys (e.g. AlMn or AlMnCu), while ribs are made from the sheet metal plated with AlSi alloys. While in service, the heat exchangers are exposed to harsh weather conditions, hence the need to ensure that the individual elements of the design are adequately protected from corrosion. One of the ways to obtain this protection is by modification of the chemical composition of aluminium alloys used in the manufacture of radiators. In this study, corrosion tests were carried out to characterise the investigated materials in terms of their corrosive behavior. The experiments included measurements of corrosion potential, testing of corrosion resistance in neutral salt spray, and electrochemical studies of selected plated AlMn alloy strips with different chemical composition.

Technical Program

WEDNESDAY PM

3:00 PM Break

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3:30 PM Crystallographic Orientation Dependence of Corrosion Behavior of 5N Purity Aluminum in Different Concentrations of HCl Aqueous Solutions: Yoshimasa Takayama1; Masayuki Sato1; Hideo Watanabe1; 1 Utsunomiya University The dependence of corrosion behavior of 99.999% (5N) purity aluminum on crystallographic orientation has been investigated in four concentrations of hydrochloric acid aqueous solutions. Before corrosion test the surface of specimen was analyzed to examine crystallographic orientation distribution, and then using SEM/EBSD technique the same area was observed by optical microscopy to detect corrosion behavior. Steps generated after the corrosion test at grain boundaries were precisely measured using geometrical calculation based on SEM observation and Laser microscopy. It was confirmed that the corrosion behavior depended strongly on the crystallographic orientation of the planes parallel to the surface. Moreover, the orientation dependence was varied with the concentration of the solution. While {101} and {111} planes have corrosion resistance in a low concentration of 1.5 mol/L HCl, the pitting rate on {111} plane was highest in a high concentration of 11.6 mol/L HCl. Further, the orientation dependence of corrosion rate is discussed. 3:50 PM Corrosion Protection of Light Alloys using Low Pressure Cold Spray: Dmitry Dzhurinskiy1; Roman Maev1; Volf Leshchynsky1; Emil Strumban1; 1 University of Windsor Corrosion attack of aluminum- based alloys is a major issue worldwide. This study provides a report on the electrochemical behavior of several types of protective metal coatings obtained by low pressure cold spray and describes the performance of the latter’s corrosion resistance properties. In this manner several metal feedstock compositions were cold sprayed on AA2024-T3 Alclad substrate. Electrochemical methods, such as OCP and DC polarization, were used in combination with materials characterization techniques to assess the performance of protective coating layers. All sprayed samples were tested in the accelerated corrosion chamber for a time period of up to 500 hours to obtain corrosion kinetics data, and with specific attention being focused on the characterization of the coating’s properties. The overall conclusion of this study is that the LPCS process could be utilized to deposit corrosion protection coatings and as to repair aluminum structures during overhaul maintenance schedule in an industry. 4:10 PM Cold Spray Process for the Repair and Manufacture of Aluminium Alloy Parts: Tiziana Marrocco1; David Harvey1; 1TWI Ltd

Being capable of producing deposits up to several centimetres thick, the cold spray process is emerging as an attractive technology for the manufacture and repair of high value aluminium and magnesium components. During the cold spray process fine aluminium or aluminium alloy powders are propelled at high velocities in the solid state at the target substrate. Due to the high velocity particle impacts, strong bonds are formed between the coating and the substrate and between particles within the deposited layer. Metallographic sections of cold sprayed coatings reveal microstructures characterised by very low porosity. With the objective of improving the abrasive wear and erosion resistance of cold sprayed coatings, ceramic reinforcements such as SiC, B4C and Al2O3 have been introduced in the feedstock to produce composite coatings, and these composite materials have been deposited with thicknesses in excess of 25mm. Several applications employing commercially available equipment have achieved industrialisation. 4:30 PM Detection of Corrosion-Related Defects and Copper Enrichment in Aluminum and Aluminium Alloy Using Positron Annihilation Spectroscopy: Yichu Wu1; P.H. Li1; Tongguang Zhai2; Paul Coleman3; 1 Wuhan University; 2University of Kentucky; 3University of Bath Corrosion-related defects in pure Al and AA2037 Al-Cu alloys were measured with positron beam-based Doppler broadening spectroscopy, in combination with SEM, EDS and AFM. Defect profiles in depth in the alloys were analyzed by measuring the S parameter as a function of incident positron energy up to 30 keV. When pure Al samples were immersed in 1M NaOH for various times, a significant increased in the S parameter near the surface was observed. This implied that the corrosion process involved the creation of defects and nanometer voids. Examination by AFM indicated that many pits were formed on the aluminium surface after corrosion. In contrast, a significant decrease in the S parameter was observed after the corrosion of water-quenched Al alloy by the same method, which ws interpreted as being a result of Cu enrichment near the metal-oxide interface layer; such enrichment at large cavity sites was confirmed by EDS.

Designing Against Fatigue Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Krishnan Sankaran, Boeing; HJ Schmidt, AeroStruc Wednesday PM June 6, 2012

Room: Rangos I Location: University Student Center

Session Chair: Jean-Christophe Ehrstrom, Constellium CRV 1:15 PM Keynote Effect of Fatigue and Damage Tolerance Material Properties on the Efficiency of Aircraft Structures: Hans-Jürgen Schmidt1; Bianka Schmidt-Brandecker1; 1AeroStruc – Aeronautical Engineering Current aircraft structures have to meet the static, fatigue and damage tolerance (F&DT) criteria according to the actual FAA/EASA regulations. Furthermore, the structures consider common industry design standards, e.g. redundant structure, large damage capability, etc. The most efficient structure in fatigue sensitive areas will be achieved by combining materials with excellent fatigue, crack growth and fracture toughness properties, a good design practice and a reliable manufacturing process. Examples for materials with excellent F&DT properties are advanced Aluminum alloys and Fiber Metal Laminates, e.g. GLARE and CENTRAL. The overall result of the above described combination is a lightweight structure, which has an adequate fatigue life, a slow crack growth behavior not requiring penalizing in-service inspections and providing a large damage capability.

Certainly this structure ensures compliance with the regulations and sufficient structural integrity during the operational life of the aircraft.

Fatigue and Fracture Toughness 4

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Krishnan Sankaran, Boeing; HJ Schmidt, AeroStruc Wednesday PM June 6, 2012

Room: Rangos III Location: University Student Center

Session Chair: Jean-Christophe Ehrstrom, Constellium CRV

Forming and Joining 8

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Wednesday PM June 6, 2012

Room: Rangos II Location: University Student Center

Session Chair: Anthony Rollett, Carnegie Mellon University 2:00 PM Mechanical Properties of Al-Mg-Sc-Zr Alloys at Cryogenic and Ambient Temperatures: Anna Mogucheva1; Dariya Zhemchuzhnikova1; Rustam Kaibyshev1; 1Belgorod State University Effect of Mg on cryogenic mechanical properties of Al–Mg–Sc– Zr alloys is considered. It was shown that this alloy with Mg 5.3% (in wt.pct.) exhibits negative temperature dependence of elongation-to-failure in the temperature interval -196 – 20°C; ductility tends to increase with decreasing temperature. Yield stress (YS) increases with decreasing temperature, concurrently. In contrast, Al-4.5-6%Mg-0.2%Sc alloy demonstrates positive temperature dependence of ductility in the same temperature interval. Application of high resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS) analysis revealed the reasons of the magnesium effect on the deformation behavior of Al-Mg-Sc-Zr alloys at cryogenic temperatures. The role of nanoscale Al3(Sc,Zr) dispersoids in plastic deformation of these alloys at cryogenic temperatures is also analyzed.

3:00 PM Break 3:30 PM The Evolution of Plate and Extruded Products with High Strength and Fracture Toughness: Diana Denzer1; Roberto Rioja1; Gary Bray1; Gregory Venema1; Edward Colvin1; 1Alcoa From the first use of 2017-T74 on the Junkers F13, improvements to plate and extruded products for applications which require the highest attainable strength and adequate fracture toughness have been made. One such application is the upper wing of large aircraft. The progression of these product improvements achieved through the development of alloys/ products that include 7075–(T651 & T7651), 7150-(T651 & T7751) and 7x55-(T7751 & T7951) is reviewed. The most current advancements

13th International Conference on Aluminum Alloys

Technical Program

2:40 PM The Metallurgy of High Fracture Toughness Aluminum-Based Plate Products for Aircraft Internal Structure: Julien Boselli1; Gary Bray1; Roberto Rioja1; Dirk Mooy1; Gregory Venema1; Gerriet Feyen1; Wei Wang1; 1Alcoa Technical Center A significant amount of “thick” aluminum plate products is used in the manufacture of an aircraft’s internal structure in applications such as ribs, spars, frames, bulkheads, etc. With the recent launch of more fuel efficient and primarily metallic single aisle aircraft but also the introduction of composite-intensive twin-aisle aircraft, a number of opportunities exist for upgrading alloys developed more than 30 years ago with a new generation of Al-based products. These include 7xxx aluminum thick plate alloys/products that show significant improvements in both strength and toughness along with Al-Li products that show high strength, low density and very high corrosion resistance with significantly improved toughness over previous generation products. This paper will review these improvements and discuss the metallurgical changes behind improved fracture toughness, particularly in the short transverse direction. The effect of composition and microstructure on quench sensitivity is also discussed.

3:50 PM Lighter and Stiffer Materials for Use in Space Vehicles: Roberto Rioja1; Diana Denzer1; Dirk Mooy1; Greg Venema1; 1Alcoa Inc Materials for use in cryotanks need high specific strength and high KIe fracture toughness to avoid crack propagation through the thickness and prevent leakage. This paper presents the evolution of Aluminum alloys and products for use in rockets from the beginning of the space age to the space shuttle. The specific strength of alloys used in Juno, Saturn, Delta rockets and the external tank of the space shuttle are discussed. The microstructure and properties of 2195 plate and 2090 sheet products are reviewed. Finally, based on improved specific strength, use of next generation upper wing AlLi plate products is proposed for next generation rockets.

WEDNESDAY PM

2:00 PM Invited Damage Tolerance Applied to the Design of Mid-Size Aircraft: Carlos Chaves1; 1Embraer S/A This paper shows an overview of the damage tolerance philosophy in the past and present design of Embraer aircraft. The basic premises that have been adopted for analysis will be discussed, such as the general criteria for selection of PSEs, loading application, material selection and properties, fatigue analysis, etc. Some tests that have been performed for validation of structural solutions will be presented. Emphasis will be given to the accomplishment of certification requirements. Further, thanks to the Embraer experience with different aircraft applications, that ranges from high usage regional jets to business jets and military aircraft, aspects about each application and the definitions limits of validity for these aircraft will be also addressed. Finally, a part of the paper will be dedicated to the discussion of future technologies that may help to improve damage tolerant design and allow future aircraft structures to become lighter, ‘smarter’ and more efficient.

include Al-Li plate and extruded products that can attain strength equivalent to that of 7055-T7751 with higher modulus, similar fracture toughness and improved fatigue, fatigue crack growth and corrosion performance. The achievement of these properties is explained in terms of the several alloy design principles. The highly desired and balanced characteristics achieved using Al-Li alloys make these products ideal for upper wing applications.

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Technical Program

WEDNESDAY PM

2:20 PM An Al–Mg–Si-Cu Alloy with Improved Formability Used for Automotive Body Panels: Fuan Guo1; 1CHALCO The growing demand for more fuel-efficient vehicles to reduce energy consumption and air pollution is a challenge for automotive industry. From the viewpoint of reducing fuel consumption and vehicle emissions, the demand for weight reduction in automobiles has increased considerably in recent years. The characteristic properties of aluminium such as good mechanical properties, good corrosion resistance, and recycling potential make it an ideal candidate to replace heavier materials to respond to the weight reduction demand. The primary automotive sheet requirements, which include adequate mechanical properties, formability and surface quality, can generally be met by Al-Mg-Si(-Cu) alloys. However, formability still remains the main problem for large-volume applications in automobile panels. In this work, a new Al-Mg-Si-Cu alloy was developed; thermomechanical processing was used to improve the formability in T4 state and the strength after paint-bake, and the results were discussed in relate to the precipitation control of the alloy.

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2:40 PM Evolution of Aluminum Can Stock Materials (1961-2011): Robert Sanders1; Eiki Usui2; Takashi Inaba2; 1Sanders Aluminum Consulting LLC; 2Kobe Steel The aluminum can has become an icon of daily life, with over 260 billion cans produced in the world each year. Introduced in the 1960’s, the can has been continuously changed and improved to keep it costcompetitive in the market and attractive to consumers. The development of alloys and processes brought about by understanding the microstructure has been essential to the successful story of the can. Concurrently, new can designs necessitated continuous changes to meet customer needs for can strength and formability. This paper will describe how alloys and sheet manufacturing processes for aluminum can bodies and lids evolved in Japan and North America over the last 50 years. Advances in metallurgical understanding that enabled many of the important improvements in the can stock product are highlighted. 3:00 PM Break 3:30 PM Manufacturing Challenges for Aluminum Sheet in the Automotive Industry: Susan Hartfield-Wunsch1; Jody Hall1; 1General Motors Aluminum sheet is used in the automotive industry for body applications such as hoods, liftgates, and doors, as a way to achieve mass reduction and improve fuel economy. Aluminum sheet usage has been steadily increasing to assist in meeting new fuel economy regulations and consumer demand for improved fuel economy resulting from high fuel costs. With the accelerated need to decrease mass to support aggressive fuel economy improvements, it is expected that the volume of new applications will not only push the manufacturing restrictions, but also exceed the current capacity of automotive-grade aluminum sheet. This paper will outline the major challenges in manufacturing aluminum sheet metal components and describe new alloys and new technologies that are being explored to overcome these challenges. Suggestions for future research and development projects will be made to accelerate additional applications. 3:50 PM New Al-Mg-Si Alloy V-1341 Alloyed with Calcium for the Aviation and Automotive Industries: Gennady Klochkov1; Olga Grushko2; Victor Ovchinnikov3; Valery Popov2; 1FSUE “VIAM”; 2FSUE VIAM; 3RAC MiG The positive effect of calcium on the properties of Al-Mg-Si alloy is studied in this paper. Results of investigations of structure, mechanical and corrosion properties of sheets and extruded products of V-1341 alloy with calcium and details obtained by forming and welding are shown.

4:10 PM Thermal Modeling and Die Design Tools for Warm Forming Applications: Nia Harrison1; George Luckey1; 1Ford Motor Company There has been little published work on the production, die architecture and thermal stability issues of warm forming (WF) technology when scaling from the laboratory to a full-size component at production-rates. One critical area of research essential to achieving high volume warm forming is the development of engineering tools for the heating and thermal control of dies. This paper introduces the development of an analytical analysis method supporting upfront WF die design. The analysis applies conservation of energy to manage and simplify the complex boundary conditions. The outputs include heat transfer parameters for the insulated, exposed, and metal working surfaces of the die, as well as energy and heat-up time estimates. These parameters directly support the simulation and optimization of a WF die using steady-state thermal finite element analysis. The validation of the predicted heat transfer parameters for die boundary conditions has been evaluated using a simple benchmark selfheated block with differing boundary condition parameters.

ICME 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: John Allison, University of Michigan; George Spanos, The Minerals, Metals & Materials Society Wednesday PM June 6, 2012

Room: Dowd Location: University Student Center

Session Chair: Mei Li, Ford Motor Company 2:00 PM A Brief Overview of ICME: Current State and Path Forward: John Allison1; George Spanos2; 1The University of Michigan; 2TMS Effective integration of advanced computational tools, experimental innovations, and digital data can significantly reduce the time and costs associated with developing new advanced materials. More specifically, integrating design, materials innovations, product performance analyses, and manufacturing processes across product development teams can support this accelerated development of new materials and products, from the discovery stage to deployment. This approach is referred to as Integrated Computational Materials Engineering (ICME), and is directly associated with the goals and philosophy of the Materials Genome Initiative (MGI). After first presenting some background on ICME and the MGI, this talk will provide a brief discussion of the present state of ICME and the MGI (including some recent events and initiatives), and the projected potential and path forward of this relatively new discipline. 2:40 PM A Through Process Model for AA3xxx Aluminum Alloys: Warren Poole1; Mary Wells2; Nick Parson3; 1UBC; 2University of Waterloo; 3Rio Tinto Alcan The application of AA3xxx aluminum alloys in automotive heat exchanger systems is a growth area. This work involves the development of a series of linked mathematical models which describe microstructure evolution as a function of processing conditions including homogenization, hot extrusion and the final brazing heat treatment. It is necessary to link the processes and track microstructure through the processes in order to predict final microstructure and properties of the aluminum in heat exchanger applications. For example, the homogenization step is critical to control the morphology, shape and spatial distribution of second phase particles, i.e. dispersoids and constituent particles. The results of i) a chemistry dependent finite difference model for homogenization, ii)a finite element based hot extrusion model and iii) a model for cold work and annealing

model will be described with emphasis on the successes of the model but the challenges for future work will also be addressed. 3:00 PM Break 3:30 PM Through Process Simulation of Al-Sheet Production – a TextureBased and a Texture-Free Approach: Thiemo Brüggemann1; 1Institute of Physical Metallurgy and Metal Physics, RWTH-Aachen University The simulation of whole processing chains of Al-sheet production is an attractive research topic for the aluminum industry, since a numerical mapping of the process has the potential to predict final properties and influences of single parameters in a cost-efficient way. In this work a modular through-process modeling set-up is presented, allowing for different combinations of time- and partially space-resolved simulation tools. In a first combination, a dislocation density based model, being capable of simulating work-hardening, recovery and recrystallization, is coupled with a roll-gap model. Thus, recrystallization-kinetics and stresses of whole processing-chains can be calculated within minutes. The second combination includes texture simulation. Rolling textures are simulated by a grain-interaction model. During recrystallization texture evolution and kinetics are calculated by a cellular automaton. Both sequences account for micro-chemistry effects and use industrial rolling-schedules as input. Simulation results will be compared to findings from industrially processed Al-sheet and experimental results.

Phase Transformations 5

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Gary Shiflet, University of Virginia; Dave Laughlin, Carnegie Mellon University Wednesday PM June 6, 2012

Room: Connan Location: University Student Center

Session Chair: Alexis Deschamps, Grenoble Institute of Technology 2:00 PM A Study of Stress Effects on Beta-Phase Precipitation in Al-Mg Alloys Using In-Situ TEM: Daniel Scotto D’Antuono1; Jennifer Gaies2; William Golumbfskie2; Mitra Taheri3; 1Drexel University ; 2Naval Surface Warfare Center; 3Drexel University The 5xxx series aluminum-magnesium alloys are non-heat treatable metals commonly found in structural applications due to excellent corrosion resistance and weldability. Despite these strong characteristics these systems are prone to sensitization which leads to failure. Here, magnesium segregates toward grain boundaries and precipitates as Al3Mg2 (ß-phase). This ß-phase renders the alloy susceptible to intergranular and stress corrosion cracking (IGSCC). Aging exposure to medium/high temperatures, corrosive environments, and load contribute to the overall failure. Current studies on 5xxx sensitization have neglected to examine the effects of stress along with temperature on ß-phase formation. In this work, the ß-phase precipitation mechanism is observed by conducting simultaneous heating and straining experiments using in-situ TEM. This will allow for the determination of the time, temperature, and stress that give rise to the sensitization. Understanding the precipitation of ß-phase is necessary to mitigate and prevent its formation and thus reduce the susceptibility of these alloys.

13th International Conference on Aluminum Alloys

Technical Program

4:10 PM TCAL1 and MOBAL2 - The Development and Validation of New Thermodynamic and Mobility Databases for Aluminium Alloys: Paul Mason1; Andreas Markstrom2; Y Du3; S. Liu3; J. Zhang3; L Kjellqvist2; J Bratberg2; A Engstrom2; Q. Chen2; 1Thermo-Calc Software Inc.; 2ThermoCalc Software AB; 3Central South University CALPHAD based software tools together with related thermodynamic and kinetic databases have been applied extensively to the modeling of Al alloys for decades. The approach relies on the capability to provide fundamental phase equilibrium and phase transformation information in materials of industrial relevance, which is possible due to the adopted methodology where free energy or atomic mobility of each phase in a multicomponent system is modeled hierarchically from lower-order systems, and model parameters are evaluated by considering both ab-initio and various experimental data. A new thermodynamic database, and a corresponding mobility database is presented for Al-base alloys based on the critical evaluation of all the constituent binary systems across their

4:30 PM Aluminum is Aluminum, Right?: Chandler Becker1; Ellad Tadmor2; 1 NIST; 2Dept. of Aerospace Engineering and Mechanics, University of Minnesota Atomistic simulations are becoming more widely used in a variety of areas, including industrial research and development. However, substantial barriers limit the broad use of these methods, both on their own and as part of an Integrated Computational Materials Engineering (ICME) or multiscale/hierarchical approach. These barriers include the availability of interatomic potentials to model atomic interactions for particular systems, methods to compare them, and tools to assess their accuracy (including uncertainties). We will address the development of the Knowledgebase of Interatomic Models (openKIM.org) as a resource for interatomic potentials and associated tests of their properties. To highlight how calculated properties can depend on the interatomic potential, we will present work with aluminum to compare molecular simulation results with experiment and/or first-principles calculations. We will also discuss major issues identified in the annual NIST “Atomistic Simulations for Industrial Needs” workshops that are designed to facilitate interactions between industrial and academic researchers.

WEDNESDAY PM

3:50 PM Modeling the Recrystallization Textures in Al Alloys after Various Rolling Reductions: Jurij Sidor1; Roumen Petrov1; Leo Kestens1; 1 University Gent Different degrees of rolling reductions account for diverse recrystallization mechanisms and thus different microstructural and texture features. The microstructure and texture of deformed and recrystallized materials is strongly affected by the material’s chemistry and the rolling conditions. The chemical composition of the material controls the formation of large non-deformable particles while the strain magnitude and the friction conditions affect the deformation flow around the hard inclusions and deformation flow across the thickness, respectively. The presence of large constituent particles produces strain heterogeneities during cold rolling which causes specific texture development. The development of deformation and recrystallization textures is discussed based on experimental data and results of finite element and crystal plasticity simulations. A recrystallization model is presented that incorporates the microstructural heterogeneities and changes in local stored energy. The experimental observations and results of crystal plasticity calculations testify that orientation selection during recrystallization is controlled by low stored energy nucleation.

full range of composition and 59 ternaries, 15 quaternaries and 1 quinary. This database contains all the important Al-based alloy phases within a 26-element framework [Al-Cu-Fe-Mg-Mn-Ni-Si-Zn-B-C-Cr-Ge-SnSr-Ti-V-Zr-Ag-Ca-H-Hf-K-La-Li-Na-Sc] and in total 345 solution and intermetallic phases are included.

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WEDNESDAY PM

2:20 PM Ageing Hardening and Precipitation of the 7A60 Alloys during Cooling Aging: Liu Yan1; 1Harbin Institute of Technology Effect of non-isothermal aging treatment on microstructure and properties of 7A60 aluminum alloys was in present work. Hardness and electronic conductivity were improved greatly during initial cooling stage. Afterward, hardness was slightly affected while electronic conductivity was increased gradually by following cooling treatment. Plate-like η’, which was precipitated along {111}Al, was observed to be the main strengthening phase by transmission electron microscopy (TEM) and high-resolution transmission electron microscope (HRTEM). Nucleation and growth of a large amount η’ phases led to the significant improvement of hardness and electronic conductivity during initial cooling stage. Finer and dispersed η’ phases were precipitated in Al grains in the following cooling treatment, which ensures the increase of conductivity while the hardness remain unchanged. 2:40 PM Precipitation Morphology in Al-Mg-Si-Sc-Zr Hot-Rolled Sheet: Kenichi Ikeda1; Ryutaro Akiyoshi1; Takuya Takashita1; Masatoshi Mitsuhara1; Satoshi Hata1; Hideharu Nakashima1; Kazuhiro Yamada1; Kenji Kaneko1; 1 Kyushu University In order to clarify the morphology and the elemental distribution of particles in Al-Mg-Si-Sc-Zr alloy, microstructural observations and elemental analyses were carried out by transmission electron microscopy (TEM), scanning TEM, three-dimensional electron tomography and energy dispersive X-ray spectroscopy. Al-0.5Mg-0.5Si-0.3Sc-0.2Zr (mass %) alloy was cast, homogenized and hot-rolled. Two types of Al3(Sc, Zr) particles with L12 structure were observed in the hot-rolled sheet: spherical particles about 50 nm in diameter, and rod-like particles about 50 nm in diameter and 200 nm in length. All particles have the core-shell structure with the core enriched with Sc and the shell enriched with Zr atoms. One type of spherical particles have a semi-coherent relationship with the matrix, while another type of spherical particles shows a cylindrical core morphology and have an incoherent relationship with the matrix. In summary, it is interpreted that the rod-like particles, the coherent spherical particles and the incoherent particles are formed during casting, homogenized treatment and hot-rolling, respectively.

TMP Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Wednesday PM June 6, 2012

Room: McConomy Auditorium Location: University Student Center

Technical Program

Session Chair: Wojciech Misiolek, Lehigh University

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1:15 PM Keynote Characterization of Metal Flow in Metals Processing by a Combined Approach using Advanced Experimental Grid Pattern Techniques Coupled with FE-analysis: Henry Valberg1; 1The Norwegian University of Science and Technology (NTNU) Experimental grid pattern techniques have lately been developed to a very high level of sophistication. The engineer now can determine the real metal flow in industrial or laboratory processes with high accuracy. Concurrently, software for FE-analysis has been developed to a very powerful tool that allows detailed observations to be made regarding metal flow on the computer in any industrial process. The advanced experimental grid pattern techniques currently available are described and it is shown how they can be used to analyze metal flow inside and on the surface of the workpieces subjected to metal forming. It is also shown how accurate FE-

models can reproduce the deformational behavior of the metal during the processing. Useful information can be deduced, it can be explained how typical process-related defects are created in a process, so that preventive measures can be taken to avoid the occurrence of such defects in an industrial environment.

TMP 5

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Wednesday PM June 6, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: Marzena Lech-Grega, Institute of Non-Ferrous Metals 2:00 PM Distinguishing Dynamic Recrystallization (DRX) in Aluminum and Single Phase Alloys: Hugh McQueen1; 1Concordia University Dynamic recovery DRV during hot working occurs to a decreasing degree with lower stacking fault energy in Al, Ni, Cu, gamma-Fe. With rising strain, the dislocations form dynamically stable boundaries (SIB); transition boundaries TD of deformation bands develop to exceed 15 degrees (HAB), producing different texture components. In cold working, the presence of SIB-HAB or (TD-HAB) are not considered recrystallization until in annealing, HAB regions convert to mobile boundaries (free of dislocations within nuclei) in discontinuous static recrystallization dSRX. In hot working of low SFE metals, the critical strain for discontinuous dDRX is higher than for dSRX that is only considered to have occurred if the straining had stopped. In hot working of Al and solute alloys, there is a critical strain for dSRX when straining stopped. For same test condition, it is not logical to claim continuous cDRX has occurred because SIB-HAB are observed when quenched to inhibit dSRX. 2:20 PM Examining the Mechanisms of Dynamic Recrystallization (DRX) in Two-Phase Al Alloys: Hugh McQueen1; 1Concordia University Second phase particles raise density and stability of strain-induced dislocation boundaries (SIB-HAB high-angle) and also markedly diminish boundary transformability and mobility at high temperature. In deformation of Al-Mg-Mn, large Al6Mn particles create surroundings of high-density cells that can nucleate particle-stimulated static or dynamic recrystallization (PSN-SRX or PSN-DRX, discontinuous with mobile boundaries,GB) that are valuable for grain refinement (if no pinning by fine Al6Mn). Hornbogen showed that fine particles in high density after cold working can markedly deter dSRX, but the SIB-HAB reorganize into boundaries that would be mobile if not particle pinned; this is continuous cSRX. After heavy thermomechanical processing (TMP: <300°C,>5s-1), Al-Cu-Mg-Zr, or Al-10Mg-Zr, when subjected to superplastic testing (>400°C, <10-2s-1) SIB-HAB rapidly rearrange into GB capable of rapid shearing, thus supporting very high elongations; a rearrangement that deserves the name continuous cDRX. The previous dislocation build up into very stable SIB-HAB during TMPis not reasonably classed as cDRX. 2:40 PM Mechanical Characterization of Bimodal Grain Size Aluminum 5083 under Various Test Conditions: Andrew Magee1; Leila Ladani1; 1The University of Alabama A 5083 aluminum alloy with a bimodal grain size distribution consisting of a nanocrystalline grain matrix, created by cryomilling, and coarse grains has been produced. This material has been shown to exhibit greatly improved properties when compared to conventional Al-5083 and

nanocrystalline aluminum. This work investigates how the test conditions affect the mechanical behavior of this material. A full factorial experiment is designed to investigate effects of strain rate, size, material orientation, and coarse grain volume ratios through uniaxial tensile tests. The results are found to conform well to Joshi’s model for plasticity. Strength and ductility is found to decrease with increasing strain rate and specimen thickness is found to affect the stiffness of the material. Increasing coarse grain ratio is found to increase ductility, though it appears that the effect may become saturated at some point. Furthermore, significant anisotropy effects are observed. 3:00 PM Break

3:50 PM Microstructure, Mechanical and Electrical Properties Evolution during Cold Rolling of Different 1xxxx Series Aluminium after Continuous Casting: Tadeusz Knych1; Artur Kawecki1; Grzegorz Kiesiewicz1; Pawel Kwasniewski1; Andrzej Mamala1; Beata Smyrak1; Wojciech Sciezor1; 1AGH - University of Science and Technology Conventional aluminium processing involves continuous casting, hot and cold metal forming and optional heat treatment. Modern processes aim to shorten the cycle of manufacturing and consist cold metal forming after continuous casting. A well-known example of such solutions is the twin-roll casting and cold rolling of aluminium sheets. For these reasons an analysis of the impact of cold deformation on structure and properties of materials after continuous casting and analysis of its quality becomes an important research problem. The paper shows the results of laboratory aluminium continuous casting. The effects of inoculant micro-additions which modify the structure of casts and its effect on the macroscopic properties of the material were examined. The paper also shows the results of laboratory tests of material cold rolling after continuous casting. The mechanical properties of material as a function of cold deformation evolution and a number of utility properties of finished sheets were examined.

TMP 7

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Wednesday PM June 6, 2012

Room: Wright Location: University Student Center

Session Chair: Nick Parson, Rio Tinto Alcan 2:00 PM Effect of Si and Mn Additions on Solid Solution Hardening of Aluminum Alloys: Qinglong Zhao1; Bjørn Holmedal1; 1Norwegian University of Science and Technology Non-heat-treatable aluminum alloys owe their strength mainly to elements in solid solution, and they usually contain more than two elements in solid solution. But the combination effect of multiple elements on strength is not well known. Small amount of Si usually exists in many commercial alloys. A weak solid solution hardening of Si is predicted theoretically by Leyson et al (Nature Mater 2010), but few quantitative evidences are reported. Furthermore, small amounts of Si may affect solid solution hardening of Mn in AA3xxx alloys. A number of commercial purity aluminum alloys (AA1xxx and AA3xxx) are investigated in this work. The varied solute contents are achieved by cast compositions and heat treatments. The strength is measured by tensile tests at room temperature.

13th International Conference on Aluminum Alloys

Technical Program

4:10 PM Modeling of Work-Hardening in an Age-hardenable AA7108 Aluminum Alloy: Ida Westermann1; Odd Sture Hopperstad2; Ole Runar Myhr3; Knut Marthinsen2; Bjørn Holmedal2; 1SINTEF; 2Norwegian University of Science and Technology; 3Hydro Aluminium To understand and predict the mechanical properties of aluminum alloys are of great importance with respect to e.g. strength requirements and forming operations. For heat-treatable alloys, the strength and workhardening behavior is mainly attributed to the presence of hardening precipitates. In this work, a first step has been taken to further develop an already existing two internal state variable work-hardening model that has been previously validated for Al-Mg-Si alloys, to include alloys within the Al-Zn-Mg system. The input parameters are based on quantitative

4:30 PM Overageing Kinetics in Fibrous vs Recrystallised Al-Mg-Si-Cu Alloys: Jostein Røyset1; Jon Holmestad1; Calin Marioara2; 1Hydro Aluminium Research and Technology Development; 2SINTEF Materials and Chemistry The Al-Mg-Si(-Cu) alloys are by far the most applied aluminium alloys for extrusion, due to the favourable combination of extrudability and functional properties. The grain structure may be either recrystallised or fibrous, depending on the alloy composition and processing conditions. In the present work, two essentially similar Al-Mg-Si(-Cu) alloys are made, but with different Mn levels so that in the extruded state one alloy is recrystallised whereas the other is fibrous. Samples of extruded material from each alloy was solution heat treated, aged to maximum hardness at 155°C, and subsequently overaged at 200°C and 250°C for several weeks. The overageing is monitored by Vickers hardness measurements, and for selected times the microstructure is characterized in detail with TEM. The results are discussed and conclusions are drawn in the light of contemporary metallurgical theory.

WEDNESDAY PM

3:30 PM Microstructure and Mechanical Properties of an Al-Mg-Sc-Zr Alloy Subjected to Extensive Cold Rolling: Anna Mogucheva1; Evgeniya Babich1; Rustam Kaibyshev1; 1Belgorod State University Aluminum alloy was subjected to the cold rolling at strains ranging from 20 to 80%. Microstructures of the rolled sheets were studied by electron backscattered diffraction method (EBSD), transmission electron microscopy (TEM); and then tensile tests were carried out to investigate the relationship between mechanical properties and microstructural parameters that include grain size and texture distribution. The grains in the rolled sheets were effectively refined during rolling; and the texture intensity increased with increasing the rolling reduction. The strain hardening upon the cold rolling resulted in the significant enhancement of mechanical properties. It was shown by using the tensile specimens cut along the rolling direction that cold rolling with a total reduction of 20% led to the 30% increase in yield stress (YS); after 80% reduction the 62% increase in YS in comparison with initial material took place.

experimental TEM investigations of the precipitate distributions in an AA7108 aluminum alloy heat treated to different tempers. The model has been calibrated, implemented and validated with respect to data obtained by tension and compression tests. The work-hardening model shows promising results, and yields reasonable agreement between model predictions and experimental results.

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WEDNESDAY PM

2:20 PM Effect of the Process of Hot Deformation of Aluminum Alloy with the Addition of Zirconium on the Formation of its Electrical and Mechanical Properties during the Process of Heat-treatment: Marzena Piwowarska1; Piotr Uliasz1; Tadeusz Knych1; 1AGH University of Science and Technology One of the many modern materials which is used for the overhead conductors is the heat resistant AlZr alloy. The production of wires from these materials can be realised in the technology of integrated continuous casting and hot rolling or in the continuous casting technology. The main aspect of this article discusses how to obtain the material for the production of wires in the process of heat-treatment, with a specified value of electrical and mechanical properties. As a result the practical aspect of the article concerns evaluations of the production technology in respect of possibilities to influence the mechanical and electrical properties of the AlZr alloy. The aim of this work is the determination of the influence of hot deformation on the zirconium precipitation process during heat treatment. 2:40 PM Effects of Deformation Texture Intensities and Precipitates on the Anisotropy of Mechanical Properties of Al-Li Alloy 2099 T83 Extrusions: Alexandre Bois-Brochu1; Carl Blais1; Franck Armel Tchitembo Goma1; Daniel Larouche1; Julien Boselli2; Mathieu Brochu3; 1 Laval University; 2Alcoa; 3McGill University The use of aluminum-lithium alloys in aerospace applications requires a thorough knowledge of how processing and product geometry impact their microstructure, texture and mechanical properties. As with other aluminum alloys, anisotropy of mechanical properties has been related to the formation of deformation textures during thermo-mechanical processes. Static mechanical properties and microstructural characteristics such as texture and precipitate distribution were analysed in two series of 2099T83 extrusions, i.e. a cylindrical extrusion and an integrally stiffened panel (ISP). The cylindrical extrusions present <111> and <100> fiber textures while the ISP possesses the same fiber textures with lower intensities. Rolling textures such as Brass were also observed in some locations of the ISP. The levels of longitudinal strength and static anisotropy correlate well with the intensity of the fiber texture. Moreover, varying densities of T1 (Al2CuLi) precipitates were observed in the TEM.

Technical Program

3:00 PM Break

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3:30 PM Evolution in Microchemistry and its Effect on Deformation and Annealing Behavior of an AlMnFeSi-Alloy: Ning Wang1; Jarl Flatøy1; Yanjun Li2; Knut Marthinsen1; 1Norwegian University of Science and Technology; 2SINTEF Materials and Chemistry Annealing of supersaturated deformed Al-Mn-(Fe-Si) alloys at sufficiently high temperatures results in concurrent precipitation of fine dispersoids. The dispersoids have a large effect on softening behavior resulting in different grain size and texture. These effects are further studied and quantitatively decribed. Characterization of deformation structures with respect to the effect of different microchemistries (solid solution, constituent particles and dispersoids) and strains on the deformation structures has been performed. Time-Temperature-Transformation (TTT) diagrams with respect to precipitation and recrystallisation for analysis of the degree of concurrent precipitation has been established. Moreover, the microstructural evolution during annealing has been followed by scanning electron microscopy, with a special focus on the different effects of pre-existing dispersoids and concurrent precipitation (static vs dynamic Zener drag) on the early stages of softening (recovery), on the nucleation behaviour of recrystallization (mechanisms, spatial distribution and orientation distribution of nuclei) and on the kinetics and microstructure/ texture evolution of recrystallization.

3:50 PM Formation of P ({011}<566>) and {113}<110> Textures by Precipitation Pinning in Continuous Cast Al Alloys during Annealing: Tongguang Zhai1; Qiang Zeng2; Wei Wen1; Xiyu Wen3; 1University of Kentucky; 2 Central Iron and Steel Research Institute; 3Center for Aluminum Concurrent precipitation was observed during annealing of the deformed Al alloys, especially 3000 series Al alloys, due to high levels of solid solution of mainly Mn or Cr in these alloys. Uncommonly occurring recrystallization textures, such as P ({011}<566>) and {113}<110>, were developed, and grain structure became coarse and elongated in the rolling direction in the alloys, resulting in inferior formability. Strong uncommon textures could also be formed in AA3004 Al alloys without occurrence of concurrent precipitation during crystallization, indicating that the formation of these textures was not necessarily associated with concurrent precipitation but precipitates pinning dislocations and subgrain boundaries during recrystallization. The textures might be formed by lattice rotation in the deformed grains in the vicinity of coarse particles, due to sudden release of a large number of dislocations which broke free from fine precipitates at a temperature higher than the recrystallization temperature for the alloys without precipitation pinning. 4:10 PM Industrial Development of Al-Cu-Mg-Li-Ag Alloy V-1469: Yulia Klochkova1; Olga Grushko1; Vladimir Shamray2; Gennady Klochkov1; 1 FSUE VIAM; 2IMET RAS V-1469 is a new, hi-strength, corrosion-resistant, weldable Al-Cu-MgLi alloy with Ag, Sc, Zr. This paper presents results of investigations of structure, mechanical and corrosion properties of the industrial 35 mm thick plates, 0.8-3.0 mm thick cold rolled sheets and extruded products of V-1469 alloy. 4:30 PM Influence of Process Fluctuations on Weld Seam Properties in Aluminum Alloy Extrusion: Marcus Engelhardt1; Norbert Grittner1; Christian Klose1; Friedrich-Wilhelm Bach1; 1Leibniz Universität Hannover The quality of weld seams produced during extrusion of hollow profiles is a big issue in the extrusion industry. The presented investigations deal with the characterization of extruded weld seams for the alloys AlMgSi0.5 (EN AW-6060), AlMgSi1 (EN AW-6082) and AlZn4.5Mg1 (EN AW-7020). Mictrostructural analysis and material properties have been analyzed with respect to variations in billet temperature, extrusion speed, subsequent cooling and heat treatment. The alloys show distinct differences in recrystallization behavior and microstructure of the weld seams and the surrounding base material.The AlMgSi0.5 alloy shows a fully recrystallized microstructure while the AlZn4.5Mg1 and the AlMgSi1 exhibit different degrees of a partially recrystallized structure leading to substantial differences in grain size between the three alloys. This behavior results in a different dependency of the material properties on process parameter changes. As already stated by previous investigations, this influence is especially fatal to the material properties transverse to the extrusion direction for non- or partially recrystallizing alloys. 4:50 PM The Effect of 3D Networks Formed by Ni, Cu and Fe Aluminides on the Strength of Multicomponent Al-Si Piston Alloys: Zahid Asghar1; Guillermo Requena1; 1TUWien The three-dimensional (3D) architecture of multicomponent Al-Si piston alloys is studied by synchrotron microtomography as a function of the solution treatment time. The presence of eutectic Si as well Ni, Cu and Fe results in the formation of hybrid 3D structures of aluminides and Si that improve the strength of the alloys by a load transfer mechanism from the -Al to the highly interconnected rigid networks. Cu-containing Al-Si alloys show the presence of Al2Cu, Al7Cu4Ni, Al4Cu2Mg8Si7 and AlSiFeNiCu aluminides that result in a larger interconnectivity of the 3D networks

Casting & Solidification 6

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc. Thursday AM June 7, 2012

Room: Rangos I Location: University Student Center

Session Chair: Ali Unal, Alcoa 9:15 AM Single Roll Caster to Cast Aluminum Alloy Strip: Toshio Haga1; Shinji Kumai2; Hisaki Watari3; 1Osaka Institute of Technology; 2Tokyo Institute of Technology; 3Gunma University Single roll caster to cast strip with sound free solidified surface was invented. A scraper was attached to the single roll caster to improve the free solidified surface. AA5182 and AA6022 strips were cast using the single roll caster equipped with the scraper. Mechanical properties of the strip were investigated by tension test, bending test and deep drawing. Mechanical properties of the strip cast by this single roll caster were as same as those made by DC casting. Roll speed could be increased up to 30m/min. Therefore, productivity of this single roll caster is superior to the conventional twin roll caster. The centerline segregation, which is typical defect of the twin roll caster, was free at the strip cast by this single roll caster.

9:55 AM Break

10:45 AM Tests of Heat Treatment Conditions of AlZr0.22 Alloy Produced using the Continuous Casting Method: Marzena Piwowarska1; Tadeusz Knych1; Piotr Uliasz1; 1University of Science and Technology (AGH) in Cracow Over the recent years, heat resistant aluminium alloys have enjoyed a lot of interest in the power engineering industry. Among these, the most popular are alloys with the addition of zirconium. These materials are used mainly in the production of overground wires with the increased current load-carrying capacity of the HTLS type (High Temperature Low Sag). These alloys are characterised by complex properties. In the article we present the results of tests of a new AlZr alloy production technology which is based on the process of continuous casting of the semi-finished products later used in the drawing process. The aim of this paper is to determine the effect of heat treatment conditions on the value of the resistivity of aluminium with the addition of 0.22% of the mass. of Zr, and on that basis determine the optimum range of annealing process parameters of the alloy. 11:05 AM Investigation on the Evolution of the Microstructure during Homogenization in Thin Al Sheets: Ildiko Peter1; Mario Rosso1; 1 Politecnico di Torino Excellent surface quality, low-porosity, good mechanical properties represent the most important characteristics for thin Al sheets, being it largely used in a large number of different applications. Since the aforementioned characteristics strongly depend on the structure of the material, the present paper aims to discuss the results on the investigation on the effect of homogenization treatment on the microstructure of AA 8006 alloy sheets. Some thin sheets in AA 8006 alloy have been prepared by continuous casting (CC) process with some economical and metallurgical advantages over a traditionally manufactured direct chill (DC) product. Due to the rapid solidification of the metal, the microstructure develops into a strongly supersaturated aluminium solid solution and into an increased part of fine units made up mostly of intermetallic phases. All these factors have a dangerous effect on the materials formability and on the mechanical behaviour of the final product. The microstructure and the strengthening behaviour can be modified in different ways. 11:25 AM Manufacturing Technology of Aluminium Alloy Products Intended for Use in Transport by Land, Sea and Air: Tomasz Stuczynski1; 1Institute of Non Ferrous Metals Parameters of the melt spinning process for casting AlZn6Cu% Mg, AlCu7Sc, and AlSi30 aluminium alloys were presented. Studies were conducted on the geometry and microstructure of thus produced ribbons. Parameters of the consolidation process carried out on a Conform device were developed. The results of the test forging of the consolidated materials were disclosed, adopting microstructure and mechanical properties of the produced forgings as a criterion for their assessment.

10:25 AM Roll Caster to Cast Clad Strip: Toshio Haga1; Shinji KUmai2; Hisaki Watari3; 1Osaka Institute of Technology; 2Tokyo Institute of Technology; 3 Gunma University A roll caster to cast clad strip was invented, and characteristics of this caster and clad strip were investigated. A scraper was attached to make connecting easy. Al-Mg alloy is not easy to make clad strip by rolling. However, Al-Mg was easily connected other aluminum alloy strip. A

13th International Conference on Aluminum Alloys

Technical Program

9:35 AM Microstructure of 3003/4045 Aluminum Alloy Clad Strip Fabricated by Vertical Type Tandem Twin Roll Caster: Ryoji Nakamura1; Toshio Haga2; Yohei Harada1; Shinji Kumai1; 1Tokyo Institute of Technology; 2 Osaka Institute of Technology Aluminum alloy clad sheets are generally produced by hot roll bonding, but this conventional manufacturing process involves many steps. In the present study, clad strips were produced from molten alloys in one step and their microstructural characteristics were investigated. Two sets of twin roll casters were set in tandem vertically. The base strip (3003 aluminum alloy) was produced by the upper caster, and the strip was drawn into the roll-bite of the lower caster. The molten overlay material (4045 aluminum alloy) was poured, and the base strip was sandwiched between the two overlay strips. The interface between the base strip and the overlay strip was flat and no alloyed layer was observed. Remelting of the base strip did not occur, owing to the high production rate. Microstructural observation revealed that skin-formation type solidification of the overlay alloy took place from both the roll surface and the base strip surface.

scraper was useful to cast three layers clad strip. Melting point of the base strip was lower than that of overlay strips could be cast. Strips were not peeled at connecting interface by cold rolling and bending. The element of each strip did not diffuse to other strip. Roll speed was increased up to 40m/min. Productivity of clad strip using the roll caster of the present study is excellent.

THURSDAY AM

than in the case of Cu-free Al-Si alloys. The load carrying capability of the different aluminides and of the network formed by eutectic Si and aluminides is correlated with their 3D morphology. The preservation of interconnectivity as well as, up to some extent, of the morphology of the rigid phases during solution treatment is governed by the degree of contiguity between aluminides and Si, which results in a conservation of the high temperature strength exhibited in the as cast condition.

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THURSDAY AM

Casting & Solidification 8

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc. Thursday AM June 7, 2012

Room: Rangos III Location: University Student Center

Session Chair: Tim Hosch, Alcoa 9:15 AM SEM Study on Short Time Oxide Films in Molten Pure Aluminium: Behzad Nayebi1; Mehdi Divandari1; 1Iran University of Science and Technology (IUST) If a fresh surface of molten aluminum exposes to air, it oxidizes quickly and an oxide layer covers the melt surface. New oxide films formed in a very short time during pouring are thin and folded. Due to melt turbulence, the molten metal surface can fold upon itself and create a double oxide film which seems to be one of the main reasons of crack-like defects in casting. The characteristics of new oxide films were investigated based on oxidemetal-oxide sandwich (OMO) method. Surface of the OMO Sandwich has been examined using scanning electron microscope. Furthermore, the thickness of the folds of oxide films in pure aluminum has compared with Al-7Si-0.4Mg and Al-5Mg alloys. Results show that the oxide films formed in pure aluminum and Al-7Si-0.4Mg alloy had roughly same thicknesses. But in the alloy Al-5Mg case, the thickness of oxide film is many times greater than that of pure aluminum. 9:35 AM Effects of Electroslag Refining on Removal of Iron Impurity and Alumina Inclusions from Aluminum: Jun Wang1; Chong Chen1; Baode Sun1; 1Shanghai Jiaotong University Effects of electroslag refining on removal of iron impurity and alumina inclusions from aluminum were studied. The electroslag refining experiments were carried out using KCl-NaCl-Na3AlF6 slag. In the experiments, the electrodes were fed into the molten slag to obtain ingots of 70 mm diameter and 20-25 cm length under a voltage of 10-12 V, a current of 600-700 A and a descending speed of 26-106 mm-min-1. In the experiment, the 10wt%Na2B4O7 was added to the slag for the removal of iron. The purification efficiency of electroslag refining for aluminum increases with the decrement of the melt rate. The iron content can decrease from 0.42% to 0.20wt%(more than a 50% reduction in iron content) after electroslag refining under the melt rate of 180 g-min-1, and the removal efficiency of electroslag refining for alumina inclusions can exceed 97% under the melt rate of 108 g-min-1.

Technical Program

9:55 AM Break

84

10:25 AM The Effects of Extra Si and Heat Treatment on the Microstructure and Tensile Properties of Al-15%Mg2Si In-Situ Composite: Alireza Hajaghasi1; Masoud Emamy2; Amin Bahrami3; 1Department of Engineering, Saveh Branch, Islamic Azad University; 2School of Metallurgy and Materials, University of Tehran; 3Imam Khomeini International University In this study, the effect of extra Si and heat treatment on microstructure and tensile properties of in-situ Al-15%Mg2Si composite were investigated. Thus, different amounts of Si (1, 3, 5 and 7 wt. %) were added into the molten MMC before solution and aging heat treatment. The optical microscopy was used for microstructural investigation. The microstructural examinations showed that Si addition changes the morphology of primary Mg2Si particles from irregular form to dendrictic form and causes the formation of ternary of compounds of eutectic phase

and extra Si. According to the microstructural observations, heat treatment also caused a considerable modification on the morphology of the Mg2Si phases. The results obtained from tensile testing also showed a direct relationship between microstructural changes and tensile properties. 10:45 AM The Influence of Cu on Eutectic Nucleation and Morphology in Hypoeutectic Al-Si Alloys: Anilajaram Darlapudi1; Milan Felberbaum1; Arne Dahle1; Mathiesen R.H2; 1University of Queensland; 2Department of Physics, NTNU The influence of increasing additions of copper on the aluminium silicon eutectic morphology and nucleation was investigated in Sr-modified and unmodified Al-10wt%Si alloys. In unmodified alloys, increase in copper content resulted in an increase in the number of polyhedral silicon particles and thus nucleation frequency of eutectic cells. In Sr modified alloys, additions of copper resulted in an increase in the nucleation frequency of eutectic cells. Also, at high copper levels in modified alloys, a change in the eutectic interface morphology from near-planar to coral-like was observed. These observations are important as in in-situ observations of eutectic solidification in Al-Si alloys, high amounts of copper is added in orderto generate contrast between the solid and the liquid. 11:05 AM Aging Behavior of Flexcast® Al-Mg Alloys with Sc and Zr Additions: Mojan Sohi1; Nitin Singh2; Chad Sinclair1; Warren Poole1; Mark Gallerneault2; 1University of British Columbia; 2Novelis Inc. The Flexcaster® is a strip casting technology that transforms liquid aluminum into a directly rollable cast ingot. This technology is characterized by relatively high solidification and cooling rates and was used to produce AlMg-based alloys with minor additions of Sc and/or Zr. The presence of these is known to develop strengthening phases that also influence other metallurgical phenomena such as recovery and recrystallization. Aging experiments were performed on as-cast and cold-rolled samples to study the evolution of strengthening precipitates and their impact on recovery and recrystallization. Two Al-3%Mg alloys were cast, one Sc-free and the other containing 0.4%Sc. Both alloys were aged following casting at 200, 300 and 400°C for times ranging from 15 minutes to 72h. The samples were characterized by hardness and electrical resistivity measurements as well as optical and electron microscopy. Initial results show enhanced strengthening in the Sc-containing alloy and superior high temperature microstructural stability. 11:25 AM Primary Cooling Heat Transfer during the Direct-Chill Casting of Aluminum Alloy AA6111: Etienne Caron1; Amir Baserinia1; Rosa Pelayo1; David Weckman1; Mary Wells1; 1University of Waterloo The heat transfer coefficient (HTC) associated with primary cooling during direct-chill casting of AA6111 aluminum alloy was investigated by conducting casting experiments with an instrumented mould. Mould temperature measurements obtained at various positions were used as input in an inverse heat conduction analysis in order to calculate the heat flux between the ingot and the mould. Heat transfer coefficient profiles versus vertical position within the mould were obtained for casting speeds of 1.39 and 1.83 mm/s. Relatively low HTC values of 93 to 576 W/m2•K were attributed to the formation of an air gap between the ingot surface and the mould. The experimental heat transfer coefficients were compared to theoretical values predicted using a 3-dimensional CFD model of directchill casting with a simple one-dimensional density-based model of shell deformation, which calculates the air gap thickness and the HTC within the mould.

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Rudi Buchheit, Ohio State University; Jim Moran, Alcoa Inc. Thursday AM June 7, 2012

Room: Rangos I Location: University Student Center

Session Chair: Nick Birbilis, Monash University 8:15 AM Keynote Application of Microelectrochemical Methods for Understanding Localized Corrosion Behavior of Aluminum Alloys: Rudolph Buchheit1; 1 Ohio State University Nearly all forms of localized corrosion in high strength aluminum alloys are affected by the heterogeneous microstructures these alloys posses. Alloying and thermomechanical processing result in the formation of constituent, precipitate and dispersoid particles. These particles are always enriched in one or more alloying elements causing their electrochemical behavior to differ from the surrounding matrix phase. Experimental approaches based on microelectrochemical methods have enabled characterization of alloy electrochemistry on a phase-by-phase basis, and the results derived have contributed to a better understanding of localized corrosion and corrosion inhibition. These results have also led to the development of frameworks for modeling localized corrosion damage accumulation. In this presentation, the use microelectrochemical approaches in aluminum alloys will be described and examples will be used to illustrate how the results can be used to characterize and model localized corrosion damage accumulation.

Corrosion 3

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Rudi Buchheit, Ohio State University; Jim Moran, Alcoa Inc. Thursday AM June 7, 2012

Room: McKenna/Peter Location: University Student Center

Session Chair: Nick Birbilis, Monash University

9:55 AM Break 10:25 AM Corrosion Fatigue Mechanism on Hot-Forged AA6082 Aluminum Alloy: Noormohammed Saleema1; Pascal Gauthier1; X. Grant Chen1; 1 University of Quebec at Chicoutimi An attempt has been made to understand the corrosion fatigue phenomenon in AA6082 aluminum forged parts. Forged parts produced by two different feedstock materials was compared in the lab air and in a corrosive 3.5% NaCl solution under different stress levels ranging from 60 MPa to 180 MPa. The scanning electron microscopy was used to study the rupture and to identify failure modes. With corrosion and mechanical stress working together, the failure was earlier in the specimens subjected to 3.5% NaCl as compared to those subjected to the lab air irrespective of the material forms (cast-forged or extruded-forged). The corrosion fatigue performance of these specimens with different stress levels as well as the crack initiation and propagation was elaborated. It is found that there is no significant variation in corrosion fatigue resistance for final cast-forged and extruded-forged products. 10:45 AM Corrosion Inhibition of Stress Corrosion Cracking and Localized Corrosion of Turbo-Expander Materials: Bezad Bavarian1; Jia Zhang1; Lisa Reiner1; 1CSUN Stress corrosion cracking of 7050 aluminum alloys in the turbo expander industry can cause expensive catastrophic failures, especially for turbo machinery systems performing in hostile, corrosive environments. Commercially available inhibitors were investigated for their effectiveness in reducing and controlling the corrosion susceptibility. Inhibitor effectiveness was confirmed with electrochemical corrosion techniques in different solutions. Cyclic polarization behavior for samples in the 1.0% to 10.0% inhibitors showed a shift in the passive film breakdown potential. The substantial increase in the passive range has positive consequences for neutralizing pitting and crevice corrosion cell chemistry. The strain to failure and tensile strength obtained from the slow strain rate studies for 7050-T74 Al-alloy showed pronounced improvement due to corrosion inhibitor ability to mitigate SCC; the fractographic analysis showed a changed morphology with ductile overload as the primary failure mode instead of transgranular or intergranular cracking.

13th International Conference on Aluminum Alloys

Technical Program

9:15 AM Corrosion Characteristics of Sintered 7075 Aluminum Alloy under SSRT Test: Satoshi Sunada1; Kengo Kimura1; Yoshizou Ishizima2; Tomoyuki Kohida3; Norio Nunomura1; Kazuhiko Majima1; 1University of Toyama; 2Hitachi Chemical Co., Ltd.; 3Hitachi Powdered Metals Co., Ltd. Powder metallurgy (P/M) process has been applied to the production of aluminum alloys. In this experiment, therefore, two kinds of 7075 aluminum alloys prepared by the conventional ingot metallurgy (I/M) process and P/M process were used, and their corrosion behavior were investigated through the electrochemical tests such as potentiodynamic polarization test, slow rate strain tensile (SSRT) test and electrochemical impedance spectroscopy (EIS) measurement under SSRT test in the corrosion solution and the deionized water. The stress-strain curve (s-e curve) obtained from SSRT test showed that the P/M specimen indicated nearly the same maximum stress as that of the I/M specimen, while the maximum elongation of the former was about one half that of the latter in both deionized water and the corrosion solution. Both P/M and I/M specimen showed stress corrosion cracking (SCC) initiated by the pit corrosion in the corrosion solution.

9:35 AM Effect of Aging Tempers on Electrochemical and Stress Corrosion Cracking Behavior of a 7017 Al-Zn-Mg Alloy: Prasanta Rout1; M M Ghosh1; K S Ghosh1; 1National Institute of Technology (NIT) Durgapur 7xxx series aluminum alloys used in aero-vehicles structural components are prone to stress corrosion cracking (SCC) and hydrogen embrittlement (HE). Research on SCC and HE is still vibrant because of complex interplay of microstructural features with environment. Authors have discussed SCC and electrochemical behavior of under-, peak-, and overaged tempers of a weldable 7017 Al-Zn-Mg alloy. SCC was carried out by slow strain rate test (SSRT) technique at a strain rate of ~ 2.5 X 10-6 sec-1 in 3.5 Wt.% NaCl neutral, acidic and alkaline solutions. SCC susceptibility is indexed by ductility ratio (DR) i.e. strain to failure in environment to that in air. Optical and SEM are used to observe stress corrosion cracks and fracture features. Polarizations studies have been performed to assess electrochemical behavior of the 7017 alloy. SCC and electrochemical behavior have been correlated with microstructural features and second phase precipitates, studied by XRD, DSC and TEM.

THURSDAY AM

Corrosion Keynote

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THURSDAY AM

11:05 AM Corrosion Characteristics of an Al-1.78%Si-13.29%Mg Alloy in Chloride Solutions: Maximo Pech-Canul1; Rajiv Giridharagopal2; Martin Pech-Canul3; Euler Coral-Escobar4; 1Cinvestav-Merida; 2University of Washington; 3Cinvestav-Saltillo; 4Universidad del Atlántico High volume fraction SiCp/Al composites fabricated by pressureless infiltration are attractive for electronic packaging applications. However inadequate wetting and the potential attack of SiC by molten aluminum represent two major drawbacks of the method. These can be overcome by adequately controlling alloy chemistry and other processing parameters. Concerning the role of alloying elements, Mg improves wetting of SiC while Si helps to reduce the activity of aluminum at the interface. So we have investigated Al-Si-Mg alloys with varying Si and Mg content. This work deals with the localized corrosion behavior of the Al-1.78%Si13.4%Mg alloy in near-neutral chloride solutions. Since microgalvanic effects may lead to enhanced corrosion, the electrochemical behavior of intermetallics was investigated by means of Scanning Kevin Probe Force Microscopy (SKPFM). Changes in morphology due to immersion in the chloride solutions were discussed using photomicrographs obtained with SEM. The electrochemical activity of Mg2Si and Al3Fe was discussed. 11:25 AM Cathodic Dissolution of Pure Aluminum, Aluminum Alloy AA6061 and Aluminum Particle Based Coating Studied by AESEC Method: Maria Serdechnova1; Polina Volovitch1; Kevin Ogle1; 1ENSCP, LPCS The dissolution rates of Al, Mg and Si from 99.99% Al, aluminum alloy AA6016 and aluminum particle based coating on steel substrate were directly measured by atomic emission spectroelectrochemistry (AESEC) technique as a function of the applied cathodic potential. The cathodic current of the reaction was measured simultaneously and was recalculated into the OH– ions generation rate. For all alloy samples the ratio between OH– produced and Al dissolved is independent on the cathodic current density. The results are interpreted by a simple model in which hydroxide generation, Al(OH)3 formation/dissolution, and Al(OH)4- diffusion are kinetically coupled together. The selective dissolution of Mg and Si and the detachment of Al particles from the aluminum based coating are also measured and discussed.

Forming and Joining 9

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Kaan Inal, University of Waterloo; Raj Mishra, General Motors Inc. Thursday AM June 7, 2012

Room: Rangos II Location: University Student Center

Technical Program

Session Chair: Robert Sanders, Chongqing University

86

9:15 AM Buckling of Aluminium Sheet Components: Vishwanath Hegadekatte1; Yihai Shi1; Dubravko Nardini2; 1Novelis Inc.; 2Oxford Engineering Solutions Ltd Wrinkling is one of the major defects in sheet metal forming processes. It may become a serious obstacle to implementing the forming process and assembling the parts, and may also play a significant role in the wear of the tool. Wrinkling is essentially a local buckling phenomenon that results from compressive stresses (compressive instability) e.g., in the hoop direction for axi-symmetric systems such as beverage cans. Modern beverage can is a highly engineered product with a complex geometry. Therefore in order to understand wrinkling in such a complex system, we have started by studying wrinkling with the Yoshida buckling test. Further, we have studied the buckling of ideal and dented beverage cans under axial

loading by laboratory testing. We have modelled the laboratory tests and also the imperfection sensitivity of the two systems using finite element method and the predictions are in qualitative agreement with experimental data. 9:35 AM Predicting Hot Deformation of AA5182 Sheet: John Lee1; Alexander Carpenter1; Jakub Jodlowski1; Eric Taleff1; 1The University of Texas at Austin Aluminum 5000-series alloy sheet materials exhibit substantial ductilities at hot and warm temperatures, even when grain size is not particularly fine. The relatively high strain-rate sensitivity exhibited by these non-superplastic materials, when deforming under solute-drag creep, is a primary contributor to large tensile ductilities. This active deformation mechanism influences both plastic flow and microstructure evolution across conditions of interest for hot- and warm-forming. Data are presented from uniaxial tensile and biaxial bulge tests of AA5182 sheet material at elevated temperatures. These data are used to construct a material constitu- tive model for plastic flow, which is applied in finite-elementmethod (FEM) simulations of plastic deformation under multi-axial stress states. Simulation results are directly compared against experimental data to explore the usefulness of this constitutive model. The effects of temperature and stress state on plastic response and microstructure evolution are discussed. 9:55 AM Break 10:25 AM Electromagnetic Hemming for Aluminum Alloy Sheets: Jianhui Shang1; Steve Hatkevich1; Larry Wilkerson1; 1American Trim LLC Electromagnetic forming is a high-velocity and high-strain-rate forming process. It has been shown that the formability of metals can be significantly improved during electromagnetic forming. This could benefit the hemming of aluminum alloy sheets, which faces considerable problem caused by the insufficient formability of aluminum alloys. This paper presents the experimental results of hemming of aluminum alloy sheets using electromagnetic forming. And the effects of the parameters of electromagnetic forming process on the quality of the final parts will be also discussed. 10:45 AM Examination of Buckling Behavior of Thin-Walled Al-Mg-Si Alloy Extrusions: Athanasios Vazdirvanidis1; Ioanna Koumarioti2; George Pantazopoulos3; Andreas Rikos3; Anagnostis Toulfatzis3; Protesilaos Kostazos4; Dimitrios Manolakos4; 1ELKEME ; 2ETEM SA; 3ELKEME; 4 National Technical University of AThens In order to achieve the combination of improved crash tolerance and maximum strength in aluminium automotive extrusions, a research program was carried out. The main objective was the study of 6063 square thin-walled tubes buckling behavior under axial static load after various artificial aging treatment conditions. Variables examined included cooling rate after extrusion and regarding the thermal treatment, both preaging and aging, time and temperature. Analytical techniques such as metallography, electron microscopy, tensile and microhardness testing are employed for developing deeper knowledge on the effect of the aging process parameters. FEM analysis with the computer code LS-DYNA was supplementary applied for deformation mode investigation and load prediction. Results showed that experimental data from static compression and numerical modeling are in a good agreement with each other. 11:05 AM Cancelled Fracture Anisotropy of Al-Mg-Si Alloy Sheets during Bending in T4P Temper State: Aleksandar Davidkov1; Roumen Petrov1; Peter De Smet2; Leo Kestens1; 1UGent; 2Aleris Aluminium Duffel B.V.B.A.

ICME 3

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: John Allison, University of Michigan; George Spanos, The Minerals, Metals & Materials Society Thursday AM June 7, 2012

Room: Dowd Location: University Student Center

Session Chair: John Allison, The University of Michigan

9:55 AM Break 10:25 AM Numerical Simulation of Flat Rolling Practices: Yihai Shi1; Peidong Wu2; Mark Gallerneault3; 1Novelis Global Technology ; 2McMaster University; 3Novelis Global Technology The hot rolling process with tapered ingot is simulated by finite element analysis. An in-house material model has been developed and implemented into ABAQUS finite element analysis software through a user material subroutine (UMAT). The rolling load, torque, deformed shapes are found to be in good agreement with measurements. It has been demonstrated that this FE model is able to accurately describe the coupled thermal-

10:45 AM Modelling the Effect of Room Temperature Storage and Deformation on the Age-Hardening Behavior of Al-Mg-Si Alloys: Carmen Schäfer1; Ole Runar Myhr2; Zeqin Liang3; Henk-Jan Brinkman1; Olaf Engler1; Jürgen Hirsch1; Cynthia Chang4; John Banhart3; 1Hydro Aluminium Rolled Products GmbH; 2Hydro Aluminium, Research and Technology Development; 3Helmholtz Zentrum Berlin für Materialien und Energie; 4 Technische Universität Berlin The present investigation deals with modelling of the age-hardening behaviour during processing of Al-Mg-Si alloys. As a basis for the work, a previously developed model for coupled nucleation, growth, dissolution and coarsening in diluted alloys has been advanced to handle the important effect of room temperature storing and pre-deformation prior to the final age-hardening. The model predicts the temporal evolution of the particle size distribution and the resulting room temperature yield strength. The validation of the model is based on a comprehensive experimental investigation involving tensile tests and some TEM measurements of the precipitation structure of selected samples subjected to various pretreatments prior to the final age-hardening. It is concluded that the model yields reasonable predictions of the age hardening response for the investigated conditions, and can thus serve as a tool for predicting the resulting yield strength of Al-Mg-Si alloys following complex multi-stage heat treatments and industrial relevant processes. 11:05 AM Application of Computational Thermodynamics and Precipitation Kinetics to Light Weight Al Alloy Design: Danielle Belsito1; Victor Champagne2; Richard Sisson1; 1Worcester Polytechnic Institute; 2US Army Research Laboratory The U.S. Military requires structural materials that offer significant weight reduction with improved performance, multi-functionality, durability, and cost reduction to enhance the lethality and survivability of the individual soldier and advanced weapon systems. To meet that need, new high strength, high toughness, light weight alloys are being developed. The primary focus of this effort is to develop an aluminum alloy powder that can be consolidated by the cold spray process, as well as by more conventional means. This will be accomplished through discovering primary process conditions and environment windows to establish the optimum multiscale chemistries and microstructures of the material before thermomechanical processing. Secondary thermomechanical process parameters will also be manipulated in order to maximize the aluminumbased heterogeneous material. Initial efforts involve the development of multi-component phase diagrams, isotherms, and isopleths using thermodynamic and kinetic software, Thermo-Calc, Pandit and TCPRISMA, to predict the microstructure and performance of these alloys. 11:25 AM The Application of ICME in Aluminium Castings Simulation: Sam Scott1; J. Guo2; 1ESI North America; 2ESI US R&D Casting processes involves many physical phenomena such as thermodynamics, heat transfer, fluid flow, stress, defect formation, microstructure evaluation, and thermophysical and mechanical properties. It is necessary to integrate the thermodynamic calculation, thermophysical and mechanical property predictions, and the prediction of microstructure and defects during solidification and heat treatment in order to better understand the effects of alloy chemistry and processing conditions, and their relationship to microstructure, defect formation, and the final mechanical properties from solidification through heat treatment.

13th International Conference on Aluminum Alloys

Technical Program

9:15 AM Invited Advances in Aluminium ICME: Juergen Hirsch1; 1Hydro Aluminium Rolled Products GmbH Simulations are applied for material properties like strength and forming properties and for the specific microstructure evolution during processing (rolling, extrusion, annealing) under the influence of material constitution and process variations through the whole production process down to the final application. Examples are discussed for the through-process simulation of microstructures and related properties of Aluminium sheet, including DC ingot casting, pre-heating and homogenization, hot and cold rolling, final annealing, including new results of solution annealing and age hardening of 6xxx alloys for automotive applications. Physically based quantitative descriptions and computer assisted evaluation methods are shown and new ICME methods of integrating ab-initio into the physically based simulation tools are discussed. Their potential use in the Aluminium producing industries are the aspects of estimating the effect of enhanced specific element effects due to growing recycling volumes requested also for high end Aluminium products.

mechanical behaviour for flat rolling processes at elevated temperatures (500°C) under various strain rates. This model also provides a useful tool for the further product and process optimization.

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11:25 AM Crystal Plasticity Calculations of Mechanical Anisotropy of Aluminium Compared to Experiments and to Yield Criterion Fittings: Kai Zhang1; Bjørn Holmedal1; Tomas Manik1; Qinglong Zhao1; 1Norwegian University of Science and Technology Mechanical anisotropy of a sheet was studied by experiments as well as crystal plasticity calculations. The material is a 99.999% high purity Aluminum with additions of 0.066%Fe and 0.068%Si. Uniaxial tensile tests at every 15° from the rolling to the transverse direction were conducted. Yield stresses were measured and also the r-values for the uniaxial tensile tests. The anisotropic Yld2004-18p yield function for fully three-dimensional stress state was fitted to the experiments. Crystallographic orientation data were measured by EBSD and used as input for the full-constraint Taylor model. The yield locus was calculated by the Taylor model and compared to the Yld2004-18p criterion fitted to the experiments. Since the number of possible mechanical tests is limited and the experimental errors can be challenged, it would be desirable to replace the mechanical tests by one texture measurement and virtual experiments by crystal plasticity calculations. The reliability of this approach is discussed for the case of pure aluminium.

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Recycling Keynote

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Diran Apelian, Worcester Polytechnic Institute; Dan Bryant, Alcoa Inc. Thursday AM June 7, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: J. Bryant, Alcoa 8:15 AM Keynote Aluminum Recovery and Recycling for the 21st Century: Challenges and Opportunities: Diran Apelian1; 1Worcester Polytechnic Institute The 21st Century has witnessed one third of the world population increase its standard of life in significant ways, and this has been accompanied with an increase in consumption of goods that has been unparalleled. Inorganic materials are not renewable and the need to recover materials and recycle them is not going to be an option. This will require changes in paradigms in three key areas: education, policy and technology/innovation. In this keynote presentation, we will review the challenges and opportunities in each of these arenas, and particularly the technology/innovation aspects. The Ferrous industry has done a good job in changing the paradigm of using recycled steel as manifested by the rise of mini-mills (vis a vis the open hearth and BOF steelmaking facilities). In a similar fashion, Al minimills will reduce the need for primary production if properly implemented. These issues will be reviewed and discussed.

Recycling 1

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Diran Apelian, Worcester Polytechnic Institute; Dan Bryant, Alcoa Inc. Thursday AM June 7, 2012

Room: Wright Location: University Student Center

Technical Program

Session Chair: Dan Bryant, Alcoa Inc

88

9:15 AM Exploring Property Based Aluminum Specifications: Naitik Gada1; Gabrielle Gaustad1; 1Rochester Institute of Technology One of the limiting factors to increased use of scrap in alloys is problematic tramp elements that accumulate in the scrap stream. Currently, alloy producers make use of blending models to assist in choosing from a large number of inputs (scrap sources, primary aluminum, and alloying elements) to manufacture a portfolio of alloys within specification. Alloys are batched to specification to maximize alloy function which includes a complex set of desired properties. While AA specifications have been put in place to guide batch blending decisions, often maximum constraints result in conservative scrap utilization, thus minimizing the potential for environmental and economic savings. This work begins to quantify the trade-offs in an approach where property based constraints are substituted for compositional constraints using a linear programming aluminum blending model tracking up to twenty alloying elements. Results show that increased scrap utilization is possible for a set of specific cases. 9:35 AM Comparison of the Influence of Si and Fe in High Purity Aluminum and in Commercial Purity Aluminum: Qinglong Zhao1; Marius Slagsvold1; Bjørn Holmedal1; 1Norwegian University of Science and Technology Commercial pure aluminum has significantly higher strength and stronger work hardening than high-purity aluminum, but it was not clear

which elements play a major role. In this work, the effect of elements Fe and Si on strength is investigated by comparison of a 99.999% high-purity base with additions of Fe and Si only versus 99.8% commercial purity aluminum. Constituent particles form in aluminum containing Fe and Si, and the distributions and chemical compositions were characterized by scanning electron microscopy and energy dispersive spectrometer to estimate the solute contents. The grain size was controlled by deformation and recrystallization. It’s found that the high-purity based aluminum with about 0.1wt% Fe and Si additions shows strength similar to commercial pure aluminum in tensile tests. It suggests that the influence on strength and work hardening is mainly by Fe and Si, and the other trace elements play a minor role. 9:55 AM Break 10:25 AM 6xxx Series Alloy Design Considerations Relating to Recycling: Malcolm Couper1; 1ARC Centre of Excellence for Design in Light Metals, Monash University This paper considers 6xxx alloy design from two perspectives: (i) the consequences for processing, quality, composition and performance of alloys that are made with a significant proportion of recycled metal or scrap, and (ii) a suitable choice of alloy which takes into consideration the recyclability in the end-use application. Based on a review of available literature, an attempt will be made to highlight technology gaps and future development opportunities. 10:45 AM Emerging Development in Al-Alloy Recycling For Nontraditional Aluminum Metal Matrix Composites Processing: Bakr Rabeeh1; 1 German University in Egypt Growing demands for new emerging materials aimed at introducing nontraditional processes. However, Direct metal oxidation, DIMOX, is applied on Al-alloy, recycling has been prompted to redesign production processes to more cost efficient. Aluminum alloy (scrap) is heated at different temperatures, 950°C, 1000°C, and 1050°C for holding time (15 to 90 minutes) and then poured into metallic mold. The kinetic of formation of hybrid composite is introduced with the effect of alloying elements addition (-Fe or Mg). Ceramic alumina phase with intermetallic fibers or whiskers established in a residual aluminum matrix. Functionally graded materials, FGM, is also introduced at prolonged holding time (90 min. at 1050°C). Scanning electron microscopy with energy dispersive X-ray spectroscopy EDX is utilized for micro-structural characterization. Besides, 3-point test is applied on another group of samples. The application of DIMOX on recycled Al-alloy with the addition of alloying elements has a dominant effect on composite micro-structural characterization. 11:05 AM Reuse of Al Dross as an Engineered Product: Chen Dai1; Diran Apelian1; 1 WPI To prevent the leaching of landfilled aluminum dross waste and save the energy consumed by recovering metallic aluminum from dross, aluminum dross is reused as an engineering product directly rather than ineffectively “refurbishing the waste”. The concept is to reduce waste and to reuse. Two kinds of aluminum dross from industrial streams were selected and characterized. We have shown that dross can be applied directly, accompanied with a simple conditioning process, to manufacture refractory components. Dross powders/particles below 50 mesh were most effective. Mechanical property evaluations revealed the possibility for dross waste to be utilized as filler in concrete, resulting in a 25% higher flexural strength and a 5% higher compressive strength compared to pure cement, as well as cement with fine sand. The potential usage of aluminum dross as a raw material for such engineering applications will be presented and discussed.

TMP 10

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Thursday AM June 7, 2012

Room: Connan Location: University Student Center

Session Chair: Henry Valberg, The Norwegian University of Science and Technology (NTNU) 9:15 AM Advances in Aluminum Mold Block for Plastic Injection Molding Operations: Jinsoo Kim1; Ron Smierciak2; Yong Seung Shin3; Leighton Cooper3; 1Alcoa Technical Center; 2Alcoa Forgings & Extrusions; 3 Samsung Electronics Mold performance with high strength aluminum alloy QC-10® in injection molding was investigated and compared with P-20 steel mold. Two different shapes of molds were tooled and tested. Interfacial heat fluxes between cooling mold and solidifying polymer melt were measured using the IHCP (Inverse Heat Conduction Method) technique during the injection molding cycles. The influence of thermo-physical properties of mold materials and polymer resins on molding cycle time and internal residual stress were also investigated by real-time measurement and double refractometer. Evaluation of the thermal energy absorbed and uniform heat extraction during injection molding revealed that aluminum mold QC-10® resulted in significant cycle time reduction and produced the part with less distortion. In addition to the benefit of reduced tooling time, it was proven that aluminum mold is a promising mold material for increasing the productivity in plastic injection molding operations.

9:55 AM Break 10:25 AM Effect of Exploitation Overhead Power Lines on the Evolution of Mechanical Properties of Wires: Andrzej Nowak1; Piotr Uliasz1; Tadeusz Knych1; Andrzej Mamala1; 1AGH University of Science and Technology During the design overhead power lines minimum lifetime is assumed between 40 and 50 years. During this time, conductor is subjected to environmental factors and operational. These problems are the cause of research into new designs, types of materials and mounting conditions. The aim is to improve the properties of corrosion, fatigue, mechanical and thermal conductor. Due to the fact that the main material used for the conductors are aluminum and its alloys wires, material must guarantee the stability of the property in service. The paper presents a comparative analysis of mechanical and electrical properties and the surface condition of the wire which were taken from the new conductor and subjected to several years of exploitation. Research includes determination of mechanical properties, resistivity measurements and evaluation of surface quality wires. The main objective of the research is to identify degree of degradation properties in the conductor after the long-term use. 10:45 AM Metalworking of a Spherical Particle Reinforced Aluminum Composite: William Harrigan1; 1Gamma Technology A new reinforcement for aluminum matrix composites has been developed by Gamma Technology. The reinforcement is spheroidized alumina that allow us to manufacture high strength composites. These composites have been extruded, forged and ring rolled in order to develop near net shape preforms for manufacture of parts. This paper will discuss the matalworking operations as well as the machanical properties of the parts that have been made. The paper will also discuss the machining of the parts since the parts were made with coated carbide tools, not diamond tools that are required for machining other aluminum composites. 11:05 AM Properties, Microstructure and Hot Deformation Behavior of Different Al-Zn-Mg (Zr) Alloys: Paola Leo1; McQueen Hugh2; Emanuela Cerri1; Stefano Spigarelli3; 1Università del Salento; 2Concordia University; 3 Università Politecnica delle Marche Two alloys based on Al-Zn-Mg (Zr), were characterized from microstructural and mechanical points of view. Hot tensile tests and torsion test on as-cast samples were performed. Deformed samples exhibit some static recrystallization (SRX) more evident in the alloy without Zr. Ascast alloys hot deformed by tension exhibits considerable cavitation that increases with T. The analysis of this phenomena on 7000 as cast alloy has shown that cavity growth is mainly controlled by plastic strain both at 250°C and 400°C even if grain boundary sliding (GBS) contributes to enhance the fraction of cavities at the highest T . Cavitation is reduced if the alloy is solutionized before deformation.

13th International Conference on Aluminum Alloys

Technical Program

9:35 AM Analysis of Dimensional Distortion in 5XXX Alloys during Annealing for Flat Panel Display Applications: Xiaoxiao Ma1; 1Department of Electrical and Computer Engineering, Lehigh University. Department of Electrical and Computer Engineering, Lehigh University Dimensional distortion during thermal cycles has been a concern for 5XXX Aluminum alloys when they are used as substrates for thin film electronics. Irreversible dimensional distortion of Aluminum alloys that accompany heat treatment greatly influence the performance and yield of devices fabricated on them. In this study, 200µm thick cold rolled 5XXX series aluminum substrates were investigated for feasibility of fabricating thin film transistors for Organic Light Emitting (OLED) displays. Photolithographic methods, combined with patterning and etching of

alignment marks on the surface, were used to evaluate the dimensional stability of these substrates in thermal cycles with various temperatures and heat-treatment times. Annealing for one hour @ 300 ° C may generate dimensional distortion of more than 50 ppm.

THURSDAY AM

11:25 AM Separation of Inclusion Particles from Liquid Metal by Electromagnetic Force: Shin-ichi Shimasaki1; Koichi Takahashi2; Yoshimasa Kanno2; Shoji Taniguchi1; 1Tohoku University; 2Tohoku University, now Furukawa-Sky Aluminum Corp. Separation of non-metallic inclusion particles from liquid metal is a very important subject not only for metal products of high quality but also establishing a recycle process of materials. Electromagnetic separation is considered as an attractive method to remove inclusions from liquid metal, because it enables separation if an electrical conductivity of particles is different from that of liquid metal. In this study, an electromagnetic separation is investigated in liquid Al/SiC particle system. The SiC particles migrate toward a side wall of a crucible due to the electromagnetic force and a particle-accumulated layer are formed on the wall. It is found that a thickness of the layer is limited to a skin depth of the electromagnetic force and the layer is formed in a balance between two forces; an electromagnetic separation force and a dispersion force due to turbulent flow.

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11:25 AM Super High Strength Aluminum Alloy Processed by Ball Milling and Hot Extrusion: Ruixiao Zheng1; Han Yang1; Zengjie Wang1; Shizhen Wen1; Tong Liu1; Chaoli Ma1; 1Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University Nanostructure strengthened aluminum alloy was prepared by powder metallurgic technology.The rapid solidification Al-Cu-Mg alloy powder was used in this study. To obtain nanostructure, the commercial powder was intensely milled under certain ball milling conditions.The milled powder was compacted first by cold isostatic pressing (CIP) at a compressive pressure of 300MPa, and then extruded at selected temperature for several times to obtain near full density material. Microstructure and mechanical properties of the extruded alloy were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and mechanical tests. It is revealed that the compressive strength of extruded alloy is higher than 800MPa. The strengthening mechanism associated with the nanostructure is discussed. 11:45 AM Tailored Welding Technique for High Strength Al-Cu Alloy for Higher Mechanical Properties: Nagendrappa Biradar1; Ramling Raman1; 1 Indian Institute of Technology, Bombay AA2014 aluminum alloy, with 4.5% Cu as major alloying element, offers highest strength and hardness values in T6 temper and finds extensive use in aircraft primary structures. However, this alloy is difficult to weld by fusion welding because the dendritic structure formed can affect weld properties seriously. Among the welding processes, AC-GTAW technique is largely used for welding. As welded yield strength was in the range of 190-195 MPa, using conventional GTAW technique. Welding metallurgy of AA2014 was critically reviewed and factors responsible for lower properties were identified. Square-wave AC GTAW with Transverse mechanical arc oscillation (TMAO) was postulated to improve the weld strength. A systematic experimentation using 4 mm thick plates produced YS in the range of 230-240 MPa, has been achieved. Through characterization including optical and SEM/EDX was conducted to validate the metallurgical phenomena attributable to improvement in weld properties. Keywords: GTAW, square-wave-AC, transverse mechanical arc oscillation

TMP 8

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Thursday AM June 7, 2012

Room: McConomy Auditorium Location: University Student Center

Technical Program

Session Chair: Zenji Horita, Kyushu University

90

9:15 AM Development of Age-Hardening Technology for Ultrafine-Grained Al-Li-Cu Alloys Fabricated by High-Pressure Torsion: Hiroaki Motoshima1; Shoichi Hirosawa1; Seungwon Lee2; Zenji Horita2; Kenji Matsuda3; Daisuke Terada4; 1Yokohama National University; 2University of Kyushu; 3Toyama University; 4Kyoto University Recently, severe plastic deformation has attracted attention as a method for improving the strength of metallic materials. High pressure torsion (HPT) process is one of the most powerful techniques to fabricate ultrafine-grained materials. In this study, the development of high strength and high ductile materials was aimed by combination of severe plastic deformation and age-hardening techniques. The experiments were

conducted using 2091 Al-Li-Cu alloy sheet processed by HPT through Micro Vickers hardness test and TEM observation. Although the hardness of HPT-processed specimen monotonously decreases during aging at 463K, it was successfully achieved to increase the hardness up to 290HV by 373K aging. This result suggests that the combined processing of severe plastic deformation and age-hardening techniques enables the fabrication of ultrafine-grained alloys with highest strength among aluminum alloy wrought materials. 9:35 AM Evolution of Fragmented Fe-intermetallic Compounds in the SemiSolid State of Al-Mg-Si-Fe Alloys by Deformation Semi-Solid Forming Process: Chakkrist Phongphisutthinan1; Hiroyasu Tezuka1; Equo Kobayashi1; Tatsuo Sato1; 1Tokyo Institute of Technology Fe-intermetallic compounds are commonly considered as a harmful phase in the recycled aluminum alloys. The Deformation Semi-Solid Forming (D-SSF) process has advantages to modify these harmful compounds into more favorable particles by thermo-mechanical deformation and subsequently heating to the semi-solid state. The evolution of fragmented Fe-intermetallic compounds of the Al-Mg-Si-Fe alloy was investigated during heating to various semi-solid temperatures. The fragmented Feintermetallic compound was transformed into the polyhedral shape in the initial stage and subsequently spheroidized shape at the low semi-solid temperatures between 580-610oC. At temperatures higher than 613oC, fragmented Fe-intermetallic compounds completely melt into the liquid phase with long holding time. The Fe-intermetallic compounds are stable as solid phase at low semi-solid temperature and metastable at high semisolid temperature. 9:55 AM Break 10:25 AM Hierarchy-Strengthening in Al-Mg Alloys: Peter Liddicoat1; Maxim Murashkin2; Xiaozhou Liao1; Ruslan Valiev2; Simon Ringer1; 1The University of Sydney; 2Ufa State Aviation Technical University Utilising solute structures at multiple length scales, hierarchystrengthened Al alloys can exhibit yield strengths up to 1 GPa. Such internal alloy architectures are challenging to comprehensively characterise at the atom-scale â&#x20AC;&#x201C; transmission-based microscopy (for e.g., TEM, XRD, or SAXS) may regularly encounter spectroscopic beam convolutions, from multiple nanocrystalline grains within a specimen, that can make information retrieval complex or impossible. Atom probe microscopy, a point-projection microscope, is not affected by grain size. Using novel techniques in atom probe to account for the complete activity of solute atoms, we will present the evolution of nanostructure at progressive strain increments imparted by high-pressure torsion in Al-Mg alloys. We will discuss defect-assisted solute clustering and the conceptual developments of chemical-texture and nanotopology to describe the intergranular relationships of misorientation and curvature to provide energetically favourable conditions for solute diffusion and partitioning. 10:45 AM Identification and Distribution of Fe Intermetallic Phases in AA5657 DC Cast Ingots: Zhan Zhang1; Gaofeng Li1; X.-G. Chen1; 1University of Quebec at Chicoutimi Iron intermetallic phases and their distribution in the direct chill (DC) cast ingots of AA5657 alloy have significant impact on the quality of final sheet products. However, identification and quantitative evaluation of ironbearing phases in the ingots are great challenge due to their small size and similar composition. In this study, the phase identification and quantitative evaluation were performed using combinations of electron backscattered diffraction (EBSD) and energy dispersive spectrum (EDS) on a scanning electron microscope, and image analysis techniques. The results show that there exist four iron-bearing phases (AlmFe, a-AlFeSi, Al3Fe, Al6Fe) in the AA5657 ingots. Using deep-etching technique, typical 3D

11:05 AM Microstructure and Mechanical Properties of AA2195 DC Cast Ingot Plates: E.M. Elgallad1; A. Hekmat-Ardakan2; F. Ajersch3; X-G. Chen1; 1 University of Québec at Chicoutimi; 2Université de Sherbrooke; 3École Plotechnique de Montréal DC cast ingot plates are especially suitable for large mold manufacturing in the plastic and automotive industries. The microstructures and mechanical properties of AA2195 DC cast ingot plates in the as-cast and heat-treated conditions were studied. Aging treatments were carried out at 125 and 150ºC for 12 and 24 h. A microstructural analysis was conducted using optical and scanning electron microscopies as well as a differential scanning calorimetry. The results show a significant increase in yield and tensile strengths after aging at 150ºC. It is suggested that the strengthening of AA2195 cast plates is largely determined by the proportion of both θ’Al2Cu and T1-Al2CuLi precipitations. By adopting an appropriate heat treatment, AA2195 cast ingot plates can provide a range of satisfactory combinations of strength and ductility which fulfill the design requirements of large mold applications. 11:25 AM Residual Stresses in Thick Aluminum Impeller Forgings Measured by Neutron Diffraction: Julia Repper1; Nicolas Chobaut2; Patrick Schloth2; Vadim Davydov1; Peter Sälzle3; Jean-Marie Drezet2; Helena Van Swygenhoven1; 1Paul Scherrer Institut; 2Ecole Polytechnique Fédérale de Lausanne; 3ABB Turbo Systems AG The optimization of production routes in terms of time, cost efficiency and security aspects requires a near net shape component during the final heat treatment, which confers the desired mechanical properties to the product. For large components complex shapes lead to complicate quench paths through the thickness of the part resulting in inhomogeneous microstructures and undesired residual stress distributions, which may affect the lifetime of the component. To predict the residual stress distribution and thus, to evaluate the lifetime of thick aluminum components it is necessary to validate and improve the existing finite element simulations by confronting them with experimental data. This contribution shows the residual stress state through a thick AA2618 impeller forging, which is fully heat-treated to its peak-aged state. The residual stress distribution determined non-destructively by neutron diffraction is compared with the residual stress predicted by finite element thermo-mechanical simulations.

Casting & Solidification 7

Thursday PM June 7, 2012

Room: Rangos I Location: University Student Center

1:35 PM Fabrication of Aluminum Alloy-Based Diamond Grinding Wheel by the Centrifugal Mixed-Powder Method for Novel Machining Technology of CFRP: Takahiro Kunimine1; Motoko Yamada1; Hisashi Sato1; Yoshimi Watanabe1; 1Nagoya Institute of Technology In recent years, a novel machining technology, i.e., a gyro-driving grinding wheel system for carbon fiber reinforced plastic (CFRP) drilling has been developed. In this paper, aluminum alloy-based diamond grinding wheel for a gyro-driving grinding wheel system has been fabricated by a centrifugal mixed-powder method, which is an application of the centrifugal casting technique. An Al-5.6mass%Zn-2.5mass%Mg1.6mass%Cu alloy and an Al-4mass%Cu alloy have been chosen as base materials. Al-Zn-Mg-Cu alloyed-powder has been mixed with diamond powder. Afterwards, the mixed powder has been placed into the mold, and then molten Al-Cu alloy has been cast into the mold by centrifugal force at various temperatures in vacuum. Aluminum alloy-based diamond grinding wheel has been successfully fabricated. The microstructural observations of the aluminum alloy-based diamond grinding wheel have been carried out with a scanning electron microscope (SEM). Moreover, ability of CFRP drilling of the aluminum alloy-based diamond grinding wheel will be also discussed. 1:55 PM Rapid Solidification of a New Generation Aluminum-Lithium Alloy via Electrospark Deposition: David Heard1; Julien Boselli2; Raynald Gauvin1; Mathieu Brochu1; 1McGill University; 2ALCOA Electrospark deposition (ESD) is a rapid solidification processing technique capable of depositing a metal onto a conductive substrate. The short pulse duration and high pulse frequency, combined with the small amount of material transferred during each pulse, results in high cooling rates being realized, on the order of 105-106 C/sec. This study investigates the ability to induce solute trapping behavior, for a new generation aluminum-lithium alloy, AA2199, using ESD. Time-of-Flight Secondary-Ion-Mass-Spectroscopy (TOF-SIMS) and X-Ray Photoelectron Spectroscopy (XPS) were employed to determine solute distribution. Scanning Electron Microscopy and Scanning Transmission Electron Microscopy analysis were performed to investigate the microstructure of the rapidly solidified Al-Li deposits. TOF-SIMS and XPS data displayed a homogeneous distribution of lithium throughout the deposits, while the microscopy analysis revealed the presence of copper rich cells. It was therefore determined that the high solute content of AA2199 results in the inability to induce complete solute trapping during ESD.

Session Chair: Mark Gallerneault, Novelis Inc 1:15 PM Investigation of Acoustic Streaming in Aluminum Melts Exposed to High-Intensity Ultrasonic Irradiation: Sergey Komarov1; Yasuo Ishiwata1; Yoshihiro Takeda1; 1Nippon Light Metal Co.,Ltd. The purpose of the present work is to investigate characteristics of acoustic streaming in aluminum melts experimentally and by numerical

13th International Conference on Aluminum Alloys

Technical Program

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Ralf Napolitano, Iowa State University; MG Chu, Alcoa Inc.

simulation. In ultrasonic casting of aluminum alloys, the acoustic streaming is of considerable importance because it can affect the metal flow causing both positive and negative influences on the alloy solidification structure. High-amplitude ultrasonic vibrations were introduced in a water or molten aluminum bath through titanium or ceramic sonotrodes. Velocity of acoustic streaming was measured by a particle image velocimetry (case of water) and dynamic pressure technique. Based on the results obtained, a mathematical model of acoustic streaming was developed and incorporated into a commercial CFD code to characterize the mixing and flow pattern in the molten aluminum bath.

THURSDAY PM

morphologies of the iron-bearing particles was revealed. Results from phase volume fraction measurement show that AlmFe and a-AlFeSi are dominant phases in the zone near ingot surface, while Al3Fe becomes the major phase toward ingot center. The mechanism for the iron-bearing phase selection has also been discussed.

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2:15 PM Preparation of Al-Sc Master Alloy by Aluminothermic Reaction with Special Molten Salt: Cong Xu1; Xinxin Liu1; Fengmei Ma1; Zhiwei Wang1; Wenhong Wang2; Chaoli Ma1; 1Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University; 2Hebei Sitong New Metal Material Co., Ltd. Al-Sc master alloy is prepared by aluminothermic reaction with a kind of special molten salt under the normal atmospheric condition. To achieve larger Sc recovery rate, the composition and pretreatment of the molten salt are studied. The optimum molten salt is obtained by melting together Sc2O3, NaF, KCl, NaCl, ScF3 and Na3AlF6 mixture under a mass ratio of 3:5:10:10:2:30, followed by solidifying and crushing. The pretreated salt is added to the Aluminum melt with a mass ratio of 60:100 to prepare Al-Sc master alloy. When the residue of molten salt is reused for three times, the Sc recovery rate can reach 91%. The structure and composition of the residue are examined using X-ray diffraction (XRD) analyzer and differential scanning calorimetry (DSC) analyzer. Based on the analysis of the residue, mechanism of the aluminothermic reaction to achieve larger Sc recovery rate with this special molten salt is discussed. 2:35 PM In situ Synthesis of Al/TiC Composites by Combustion Reaction in an Al Melt: Young-Hee Cho1; Jung-Moo Lee1; Hwa-Jung Kim1; Jong-Jin Kim1; Su-Hyeon Kim1; 1Korea Institute of Materials Science, KIMS A novel process of synthesising in-situ Al-TiC composites is investigated. A certain amount of CuO addition to an Al-Ti-C system dramatically increases the adiabatic temperature and thereby leads to the formation of TiC in aluminium melt at 800 °C. TiC in 1~2 µm synthesised by selfpropagating high-temperature synthesis (SHS) is present in Al matrix along with Al2O3 and Al3Ti when adding an elemental powder mixture of Al-Ti-C-CuO to the molten aluminium directly. Increase in CuO contents promotes the TiC synthesis with increasing its volume fraction while less Al3Ti phases are observed. The reaction path of Al-Ti-C system with and without CuO is analysed by a thermal analysis and the important role of CuO in in-situ synthesising TiC upon melting and the SHS is further discussed.

Corrosion 4

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Rudi Buchheit, Ohio State University; Jim Moran, Alcoa Inc. Thursday PM June 7, 2012

Room: McKenna/Peter Location: University Student Center

Technical Program

Session Chair: James Moran, Alcoa

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1:15 PM Corrosion Performance of New Generation Aluminum-Lithium Alloys for Aerospace Applications: James Moran1; Francine Bovard1; James Chrzan1; Peter Vandenburgh1; 1Alcoa Over the past several years, a new generation of aluminum-lithium alloys has been developed. These alloys are characterized by excellent strength, low density, and high modulus of elasticity and are therefore of interest for lightweight structural materials applications, particularly for current and future aircraft. These new alloys have also demonstrated significant improvements in corrosion resistance when compared with the legacy and incumbent alloys. This paper documents the superior corrosion resistance of the current commercial tempers of these materials and also discusses the corrosion performance as a function of the degree of artificial aging. Results from laboratory corrosion tests are compared with results

from exposures in a seacoast atmosphere to assess the predictive capability of the laboratory tests. The correlations developed between laboratory tests and seacoast exposures provide confidence that a set of available methods can provide an accurate assessment of the corrosion performance of this new generation of alloys 1:35 PM Galvanic Corrosion of Al-Li Alloys Coupled to CFRP Composite: Wenping Zhang1; James Moran1; Raphael Morales1; Peter Vandenburgh1; 1 Alcoa Technical Center The use of carbon fiber reinforced polymer (CFRP) in the aerospace industry has increased over the past few decades. In the meantime, conventional aluminum alloys continue to have significant applications and a new generation of aluminum-lithium (Al-Li) alloys, with improved corrosion resistance and other properties, are also increasingly being used. Due to the difference between the corrosion potential of carbon fiber and those of the aluminum alloys, the galvanic interaction between aluminum alloys and CFRP needs to be evaluated. In this work, the electrochemical behavior of the aluminum alloys and CFRP is characterized. The galvanic corrosion performance of new Al-Li alloys and conventional aluminum alloys when coupled to CFRP is evaluated in selected lab accelerated tests and outdoor exposure, using Al-CFRP mock-up panels. The results indicate a significant improvement in resistance to galvanic corrosion for the new-generation Al-Li alloys in contact with CFRP, relative to the incumbent 7xxx alloys. 1:55 PM Comparison of Corrosion Performance and Mechanisms of Al-Cu Alloys with and without Li Addition: Christine Henon1; Sacha Rouault1; 1 Constellium CRV Al-Cu-Li alloys present outstanding corrosion resistance compared to incumbent alloys currently used for given structural aircraft parts. This paper will address the metallurgical mechanisms underlying their good corrosion performance. The corrosion behaviour of AIRWARE™ 2050 (AlCuLi) and of a Li-free alloy of otherwise similar composition (2139) has been compared. Intergranular corrosion, exfoliation and SCC have been evaluated as a function of tempering for both alloys. Both show a similar qualitative behavior: sensitization to corrosion in underaged conditions, desensitization near peak age and re-sensitization in overaged conditions. The desentization can be rationalized on the basis of microstructural investigations and electrochemical measurements: preferential dissolution in under aged conditions seems to be related to a Cu depleted zone near grain boundary. The re-sensitization in an overaged temper is still under investigation. 2:15 PM The Effect of Stress in Age-forming on Corrosion Behavior of Highstrength Aluminum Alloy: Junfeng Chen1; Gerald Frankel2; Chengyan Xu1; Guoai Li3; Zheng Lu3; Liang Zhen1; 1Harbin Institute of Technology; 2 Ohio State University; 3Beijing Institute of Aeronautical Materials Age-forming is a form of stress ageing that is widely used in modern aerospace industry. In this paper we investigated the effect of stress in the age-forming process on corrosion behavior of AA7050 in 3.5% NaCl solution and compared it to traditional ageing. Morphology analysis through optical profilometry and electrochemical impedance spectroscopy (EIS) measurement suggest that the age-formed samples exhibit more corroded attack. Stress in age-forming induced the precipitation (MgZn2) and precipitate free zone growth, which are anodic to the matrix. The bigger precipitates and wider precipitate free zone caused by age-forming result in decreased corrosion resistance of AA7050 in 3.5% NaCl solution. Additionally, stress during age-forming increases the grain aspect ratio, which is harmful to intergranular corrosion resistance. Therefore, the stress in age-forming reduces corrosion resistance of AA7050 in 3.5% NaCl solution.

ICME 4

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: John Allison, University of Michigan; George Spanos, The Minerals, Metals & Materials Society Thursday PM June 7, 2012

Room: Dowd Location: University Student Center

Session Chair: Nitin Singh, Novelis Global Technology Center

1:35 PM Modelling Grain Deformation during Extrusion of AA3003 using the Finite Element Method: Yahya Mahmoodkhani1; Mary Wells1; Lina Grajales2; Warren Poole2; Nick Parson3; 1University of Waterloo; 2 University of British Columbia; 3Rio Tinto Alcan A combination of numerical simulation using finite element method (FEM) and experimental characterization was used to study microstructure changes during the hot extrusion process for AA3003 aluminum alloy. Extrusion plant trials were conducted at the Rio Tinto Alcan Research and Development facility in Jonquiere, Quebec to measure load and temperature and to obtain samples for microstructure analysis. A 2D FEM based on the commercial code DEFORM was adopted for the thermo-mechanical

1:55 PM Experience of Developing and Introduction in Industry New Primary and Secondary Al-Alloys with Given Properties for Shape Casting: Vadim Zolotorevskiy1; 1National University of Science and Technology â&#x20AC;&#x153;MISiSâ&#x20AC;? There was created data base which includes phase diagrams, results of structure and properties investigation of thousands Al-alloys, mathematical models of composition and structure influence on mechanical and casting properties. There was developed the methodology of developing casting alloys which consists from the next steps: development of alloying principles and selection of perspective alloying systems to allow the complex of given properties by using our data base; thermodynamic calculations of phase diagrams perspective alloying systems; experimental structure investigations of perspective alloys; mathematical modeling of composition and structure influence on mechanical and casting properties; experimental investigation of all properties complex and choice the best alloys; optimization of composition and technological regimes of production best alloys for receiving needing properties, final choice the best alloy. By using that methodology there were developed tens new alloys with different complex of properties. Some of new alloys will be present in the paper.

Recycling 2

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Diran Apelian, Worcester Polytechnic Institute; Dan Bryant, Alcoa Inc. Thursday PM June 7, 2012

Room: Wright Location: University Student Center

Session Chair: Diran Apelian, WPI 1:15 PM The Influence of Pyrolythic Reactions on the the Aluminium Dross Formation during the Twin Chamber Remelting Process: Benjamin Jaroni1; Benedikt Flerus1; Georg Rombach2; Bernd Friedrich1; 1RWTH, IME; 2Hydro Aluminium Deutschland GmbH After a coated aluminum product has reached the end of life cycle it needs to be recycled in an economical way. State of the art is the thermal removal of the organic fractions by pyrolysis. In modern multi chamber furnaces this step is realized in a separate pre-heating and melting compartment of the furnace. The incidence of aluminum losses can be traced back to the contained organic components, which lead to an aluminum burn off and thus increase dross production. The influence of typical scrap package structures on the de-coating step and the impact of released organic components on the dross quantity are investigated in this work.Lab-scale experiments have shown that the average residence time is too short to complete the pyrolysis. It has to be considered that the pyrolysis continuous while the scrap bale is submerged in the aluminum melt.

13th International Conference on Aluminum Alloys

Technical Program

1:15 PM Evaluation of the Quenching Sensitivity of Al-Zn-Mg-Cu-Zr Aluminum Alloys by Mole Fraction of Equilibrium Phases: Nie Baohua1; Liu Peiying2; Zhou Tietao2; Xie Yanjun2; 1BeiHang University; 2 BeiHang University The effect of composition on the quenching sensitivity of Al-ZnMg-Cu-Zr aluminum alloys was investigated through hardness test, microstructure analysis and thermodynamic calculations. The materials involved are 7085,7050, 7150 and 7055 aluminum alloys. The results show that the aging hardness reductions for the alloys by air quenching are up to 8.6%, 18.4%, 21% and 21.7%,respectively, in comparison with that by water quenching. The precipitation of 7050 and 7055 aluminum alloys is much more compared to that of 7085 aluminum alloy during air quenching process, which decreases the capability of aging hardening and causes quenching sensitivity of 7050 and 7055 aluminum alloys. The interrelation of composition, equilibrium phase and quenching sensitivity is investigated from perspective of thermodynamic calculations, and the total mole fraction of equilibrium phase during quenching process is proposed to be a criterion for evaluating the quenching sensitivity of AlZn-Mg-Cu -Zr series aluminum alloys.

simulation of the extrusion. Load and temperature predictions resulting from this model agree well with the measured values. A microstructure model was developed to predict the post-extrusion recrystallization and the results were compared to experimental observations by optical microscope. It was concluded that the microstructure model can qualitatively predict the extent of recrystallization for different homogenization conditions, ram speeds and billet temperatures.

THURSDAY PM

2:35 PM Corrosion and Potentiostatic Polarization of an Al-Cu-Li Alloy under Tensile Stress: Jin-feng Li1; Zi-qiao Zheng1; 1Central South University The stress corrosion cracking(SCC) of an Al-3.8Cu-1.5Li-0.5Zn0.5Mg-0.3Mn alloy in 3.5% NaCl solution was studied through using slow strain rate tension(SSRT). The potentiodynamic polarization and anodic potentiostastic polarization of the stressed and stress free alloy with T6 temper were investigated. The tensile stress decreased the break down potential. The alloy was sensitive to intergranular SCC (IGSCC), due to the continuous distribution of anodic phase of T2(Al6CuLi3) along the grain boundary. During the potentiostastic polarization, the current-time curve of the stressed alloy displayed a repeated transient feature that the current increased suddenly followed by a slower recovery, and corrosion crack appeared along the grain boundary. While the stress free alloy did not show this current feature and corrosion crack along the grain boundary. The repeated current transient was associated with the crack tip propagation and crack wall passivation. This feature may be used to analyze the SCC process.

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THURSDAY PM

1:35 PM Peripheral Friction Stir Processing for Recycling Aluminium Scrap: Fadi Abu-Farha1; 1Penn State Erie While friction stir processing (FSP) has been used to refine the grain structure in sheet metals, this work presents an investigation on the production of fine-grained tubes via the novel concept of peripheral friction stir processing (PFSP). With this concept, a rotating tool is plunged into the material round specimen at a selected feed rate; this forces the processed material radially-outwards, thus forming a tube. While previous efforts targeted the processing of bulk material, this work focuses on applying the concept to aluminium scrap to investigate the possibility of recycling it into structural tubes. Preliminary results demonstrate how the technique is successful in producing tubes that are structurally sound, with no signs of voids or internal channels. Optical microscopy clearly shows the presence of a stir zone, and grain size measurements demonstrate the effectiveness of the technique in refining the microstructure of the starting material. 1:55 PM Turbulent Coagulation of Solid Particles in Molten Aluminum– Kinetics of Cluster Formation: Tao LI1; Shin-ichi Shimasaki1; Shoji Taniguchi1; Kentaro Uesugi2; 1Tohoku University; 2Japan Synchrotron Radiation Research Institute (JASRI)/ SPring8 Removal of inclusions plays a key role in the process of aluminum recycling. Many research works focus on the behaviors of inclusions in molten metal, such as coagulation and bubble flotation. To reveal its mechanism water model experiments have been performed by some researchers including the authors’ group. In the present research, experiments of particle coagulation were carried out with molten Al including SiC and TiB2 particles in a mechanically agitated system. Particles coagulated each other and formed into clusters under turbulent flow of the molten Al. The number of clusters in the melt decreased with agitating time whilst the size increased. 3-D analysis of the number and size of the clusters in solidified Al was implemented by Spring-8. A 3-D image analysis was adapted to the number of sliced 2-D photos, and the size and structure of the cluster were analyzed and compared between SiC and TiB2 particles.

Technical Program

2:15 PM Purification Using High Pressure Molten Aluminum: Vivek Sample1; William Cassada1; 1Alcoa Technical Center A novel technique has been developed to separate eutectic forming elements using a continuous supply of high pressure molten aluminum. In this process, enriched liquid in the mushy zone is selectively expelled from the solidifying mold through a permeable membrane. The fraction of expelled liquid and the level of purification attained can be controlled in real time. Application of this technique for refining smelter grade aluminum as well as recycling aluminum scrap is being explored. Unique aspects and advantages of the process will be discussed.

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2:35 PM Recycling of Aluminum Alloy with DIMOX and Rheocasting Functionalize High Performance Structural Foam Composite: Bakr Rabeeh1; 1German University in Egypt Great efforts aiming towards the synthesis and the development of structural composite materials. Direct metal oxidation, DIMOX introduced for hybrid composite processing. However, oxidation temperatures above 1100°C lead to the formation of porous ceramic materials. To utilize this porosity intentionally for foam production, a new approach based on synergetic effect of alloying elements, DIMOX and semisolid (rheocsting) processing is developed. A semisolid reaction, rheocasting is introduced to control porosity shape and size. Aluminum alloy 6xxx (automobile scrap pistons) is recycled for this objective and DIMOX at 1050°C for 20 min, then rheocasting, at 700°C for 20 minutes. The effect of Fe powder

as well as Mg powder established for the objective of a hybrid structural metal matrix composite in bulk foam matrix. The kinetic of formation of hybrid metal matrix foam composite is introduced. Microstructural and mechanical characterization established for high performance Aluminum foam composite materials.

TMP 9

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Symposium Organizers: Wojciech Misiolek, Lehigh University; Vivek Sample, Alcoa Inc. Thursday PM June 7, 2012

Room: McConomy Auditorium Location: University Student Center

Session Chair: A. Tekkaya, Technical University Dortmund 1:15 PM A Study of the Microstructure, Crystallographic Texture, and Recrystallization in AA4006 Alloy Strips Produced by Twin Roll Caster and Direct Chill Processes: Ricardo Fernandes1; Fabricio Souza2; Angelo Padilha2; Ronald Plaut2; Nelson Lima3; 1Votorantim Metais CBA; 2Universidade de São Paulo; 3Instituto de Pesquisas Energéticas e Nucleares A study of the microstructure, crystallographic texture, and recrystallization has been done in two AA4006 alloy strips produced by two industrial casting processes: twin roll caster (TRC) and direct chill (DC). Polarized optical microscopy, scanning electron microscopy with microanalysis, electrical conductivity measurements and Brinnel hardness tests have been used to characterize the microstructure of the as-cast, rolled and heat treated materials. X-ray diffraction has been used for texture characterization. Relevant differences in the morphologies and distribution of the grains and intermetallic particles were detected. Through thickness textures of these strips have been analyzed. The results obtained across thickness of the TRC specimens showed significant texture changes. A typical shear texture was observed near the surface of the TRC sheet, as well as, the ß-fibre in the mid section. Samples of the two sheets produced by TRC and DC presented a 50% recrystallization temperature around 290 ºC and 270 ºC, respectively. 1:35 PM Effect of Extensive Rolling on Mechanical Properties of an A-MgSc Alloy: Anna Mogucheva1; Andrey Dubyna1; Rustam Kaibyshev1; 1 Belgorod State University Sheets of an Al-6%Mg-0.5%Mn 0.2%Sc-0.07%Zr (in weight %) alloy with ultrafine-grained structure containing a high dislocation density (1014 m-2) were produced by equal channel angular pressing to a strain of 12 at a temperature of 300oC followed by cold rolling to a reduction of 90%. This material exhibited a yield stress of 600 MPa, an ultimate strength of 640 MPa, while elongation-to-failure obtained only ~2%. It was shown that dislocation strengthening plays a major role in achieving high strength in this alloy. The relationship between the deformation microstructure and the tensile behavior is discussed. 1:55 PM Microstructure and Texture Evolution of Al-Zn-Mg Aluminum Alloy during Cold Rolled to High Strain and Followed Annealing: Zhiqing Zhang1; Dandan Chen1; Qing Liu1; 1Chongqing University Samples of Al-Zn-Mg-Cu alloy have been produced by accumulative roll bonding to large strain of 4 and 6 followed by recovery and recrystallization during annealing. The evolution of structural parameters such as boundary spacing, dislocation density, distribution of grain boundary angles has been quantified by structural analysis applying transmission electron microscopy

2:15 PM Strategy for Enhancing Mechanical Properties of Age-Hardenable Aluminum Alloys by ECAP: Rustam Kaibyshev1; Anna Mogucheva1; Marat Gazizov1; 1Belgorod State University Several routes of thermomechanical processing (TMP) are considered to increase yield strength of age-hardenable aluminum alloys. It was shown that optimal TMP route is strongly dependent on chemical composition of aluminum alloys. Ultrafine-grained (UFG) can be easily produced by equal channel angular pressing (ECAP) at intermediate temperatures. This structure is retained under subsequent solution treatment in Sc containing aluminum alloys. If it is possible to suppress the appearance of stable phase under aging the superposition of grain size hardening and precipitation hardening may give an increment in yield strength. Yield stress of aluminum alloys containing no Sc can be significantly increase by ECAP at a low temperature in the quenched condition followed by artificial ageing. In this case the dislocation hardening and effect of increased dislocation density on precipitation sequence under ageing and precipitation hardening can provide an increment in yield stress.

THURSDAY PM

and electron backscatter diffraction. The texture evolution during cold rolling and annealing has also been quantitatively characterized using X-ray diffraction technique. The effects of second particles during cold rolling and recrystallization have been investigated.

2:35 PM Cancelled Texture and Earing Properties of Induction Annealed Continuous Cast 3xxx Aluminum Alloy: Yansheng Liu1; Xiyu Wen2; Shridas Ningileri2; 1SECAT Inc; 2University of Kentucky 2:55 PM Threshold Deformation for Exhibiting the Hardening on Annealing Behavior in AA3103 Alloy: Nagaraj Govindaraj1; Bjørn Holmedal1; 1 NTNU Hardening on annealing is reported to occur not only in nanostructured material but also at strain levels obtained by cold rolling in AA3103 alloy. A threshold deformation limit is proposed for cold rolled AA3103 alloy for exhibiting this behaviour. Tensile tests performed on samples annealed at 225 ºC for 10 minutes after cold rolling to strains of 1.5 and above revealed an increase in strength after annealing, whereas the samples annealed after cold rolling to strains up to 1.5 did not exhibit hardening on annealing. EBSD studies are used for microstructural observations and it is discussed if dislocation source limitation after annealing is causing the hardening.

Technical Program

13th International Conference on Aluminum Alloys

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the microstructure observations including fracture surface.

Poster Session

Program Organizers: William Cassada, Alcoa Technical Center; Hasso Weiland, Alcoa Technical Center; Anthony Rollett, Carnegie Mellon University Monday PM June 4, 2012

Room: Wiegand Gym Location: University Student Center

Session Chair: To Be Announced P01 - Change of Dislocation Density in Ultrafine-Grained Aluminum during Tensile Deformation: Hiroki Adachi1; Yoji Miyajima2; Nobuhiro Tsuji3; 1University of Hyogo; 2Tokyo Institute of Technology; 3Kyoto University It is reported that the intensity of UFG aluminum is several times higher than that with the coarse grains and exhibits the unique mechanical phenomena under tensile deformation. This implies that the dislocation behavior in the UFG aluminum differed from that in the aluminum with coarse grains. In this research, the change of the dislocation density with progress of the tensile deformation was examined by the in-situ X-ray diffraction technique and the effect of the grain size on the dislocation multiplication behavior was investigated. As a result, in the sample with the smaller grains, the increase of dislocation density with progress of tensile deformation was larger and the decrease of the dislocation density by the unloading with the fracture was also larger. And, in the sample of which the initial dislocation density was lower, when the grain size was equivalent, the stress for the dislocation multiplication was higher.

Posters

P03 - Electromagnetic Continuous Casting of Free-Shape Aluminum Billet: Myoung-Gyun Kim1; Joon-Pyo Park1; Jong-Ho Kim1; Gyu-Chang Lee1; 1Research Institute of Industrial Science and Technology(RIST) A new method and apparatus for the fabrication of high-quality, freeshaped aluminum billets is developed by the combination of continuous casting and electromagnetic casting/stirring technique(EMC & EMS). Traditional machine for continuous casting process involves round, square and rectangular billets; therefore it requires additional multistep forging process to fabricate final products of complicated shape. A new proposed process for the fabrication of free-shaped aluminum billets offers some advantages: the process of extrusion and forging is simplified and the cost of plastic working can be greatly reduced. In order to reduce the paticular problems such as the conventional surface crack and internal defect due to the inhomogeneous cooling of solidified billets, the electromagnetic casting and stirring technique were adopted in this paper. The effect of electromagnetic field was compared by observing the microstructure of billets. Grain refinement of aluminum billet was clearly observed by applying electromagnetic field to continuous casting process.

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P04 - Microstructure and Mechanical Properties of Al-Mn/Al-Si Hybrid Aluminum Alloys Prepared by Duo-Casting: SungJin Park1; JongHo Kim2; JunPyo Park2; SiYoung Chang1; 1Korea Aerospace University; 2RIST Al-Mn/Al-Si hybrid aluminum alloys were prepared by Duo-Casting and their microstructural and mechanical properties were investigated. The hybrid alloys consisted of Al-Mn alloy, Al-Si alloy and macrointerface between Al-Mn and Al-Si alloys. The Al-Mn alloy showed a high volume fraction dendritic structure, whereas the primary dendrites and eutectic structure were obviously shown in the Al-Si alloy. The macrointerface between two alloys were well bonded, and the growth of primary dendrites in Al-Si alloy occurred from the macrointerface. More details of microstructure were investigated with FE-SEM and EDS. The hybrid alloys with well-bonded macrointerface showed the excellent tensile strength and 0.2% proof stress which are compatible for binary Al-Mn alloy. However, the elongation was inbetween binary Al-Mn and Al-Si alloys. Such a tensile behavior of the hybrid alloys was analyzed based on

P05 - Influences of Pouring Temperature and Cooling Rate on Microstructure and Microhardness of Casting ADC12 Alloy: Xiaowu Hu1; 1Nanchang University The present paper reports on the effects of pouring temperature and cooling rate on the microstructure development and microhardness for casting ADC12 alloy. The microstructure of the cast samples was characterized by optical and scanning electron microscopy and energy dispersive spectrometry. The results show that the dendrite arm spacing (DAS) is better refined by pouring at higher temperature. The DAS decreases with increasing pouring temperature due to the multiplication of the nucleation sites in the superheating liquid melt, and the microhardness increases correspondingly. The effect of cooling rate which is controlled by changing the cooling medium (such as air and sand) on DAS and microhardness is similar to the effect of pouring temperature. P06 - Effect of Mn on the Interaction between Die Casting Steel and Al Alloy: Se-Weon Choi1; Young-Chan Kim1; Cheol-Woo Kim1; Jae-Ik Cho1; Chang-Seog Kang1; Yu-Mi Kim2; Sung-Kil Hong2; 1KITECH; 2Chonnam National University SKD61 is normally used as the die material. Die failure is an important issue in high pressure die casting process. One of the major reasons for die failure is soldering between the die and the casting alloy. As a result of soldering, the solidified alloys stick to the die to form defective casings upon ejection. Presently, Research has been done for control intermetallics by adding Fe, Mn to melting aluminum. This research used the experiment of hot dip aluminizing to study the soldering reaction and the effect of Mn. Soldering experiment made intermetallics on the surface of die steel and melting Al alloy by cooling in the air after keeping SKD61, specimens in melting Al alloy of 680 degrees. Intermetallics was analyzed using FESEM, EPMA etc. and was researched by comparative analysis of influence, added element of Al alloy makes intermetallics. P07 - Limitation of Shrinkage Porosity in Aluminum Rotor Die Casting: Young-Chan Kim1; Se-Weon Choi1; Cheol-Woo Kim1; Jae-Ik Cho1; Sung-Ho Lee1; Chang-Seog Kang1; 1KITECH Aluminum rotor prone to have many casting defects especially large amount of air and shrinkage porosity, which caused eccentricity, loss and noise during motor operation. Many attempts have been made to develop methods of shrinkage porosity control, but still there some problems to solve. In this research, the process of vacuum squeeze die casting is proposed for limitation of defects. The 6 pin point gated dies which were in capable of local squeeze at the end ring were used. Influences of filling patterns on HPDC were evaluated and the important process control parameters were squeeze time and volume, venting and vacuum suction time. By using local squeeze and vacuum during filling and solidification, air and shrinkage porosity were significantly reduced and the feeding efficiency at the upper end ring was improved 10%. As a result of controlling the defects, the dynamometer test showed improved motor efficiency by more than 2%. P08 - The Effect of Alloying Elements on Thermal Conductivity and Casting Characteristic in High Pressure Die Casting of Aluminum Alloy: Cheol Woo Kim1; Jae Ik Cho1; Se Weon Choi1; Young Chan Kim1; Chang Seog Kang1; 1KITECH Recently, demand of aluminum alloys for use in high thermal conductivity application is increases but the most aluminum die casting alloys exhibit very lower thermal properties because of their high concentrations of alloying elements. However, those alloying elements are essential to obtain sufficient fluidity and mechanical strength. Therefore, the purpose of this study is to analyze the effect of alloying elements in die casting alloys, Si, Cu, Mg, Fe and Mn, in thermal conductivity, die casting characteristics and mechanical properties and find out the appropriate amount of each alloying element for development of heat sink component.

The results showed that Mn had the most deleterious effect in thermal conductivity and Si and Fe contents were important to improve strength and limit casting defects, such as hot tearing and die soldering. The alloy with 0.2~1.0wt%Cu, 0.3~0.6wt%Fe and 1.0~2.0wt%Si showed very good combination of high thermal conductivity and good casting characteristics. P09 - Aluminum Clad Ingot Casting by Electromagnetic Stirring Technique: Jong Ho Kim1; Young-Joon Lee1; Seong Ho Seok1; Joon Pyo Park1; 1RIST Aluminum is one of the most important materials used in the foundry industry. Due to intrinsic properties of aluminum ingot and alloys, its application is limited to some extents. However clad aluminum ingot has great attention due to multiple functions by combining two or more alloys in mono ingot. Novelis company recently developed this process named as Novelis Fusion and its potential has great impact on aluminum industry. In this study, we improved clad ingot casting by implementing electromagnetic field. Previous process use modified direct chill casting so inherent disadvantage of dendritic structure of ingot still exist. By using electromagnetic field, microstructure of clad ingot has been greatly changed from dendritic to equaxed. We examine the interface and also grain distribution of electromagnetic field applied clad ingot. We expect enhaced properties are expected in post-processing, such as rolling and extrusion. P10 - An Overview of Molten Aluminium Steam Explosions: Alex Lowery1; 1WISE CHEM LLC Over 60 years ago, the first reported molten metal steam explosion from a bleed-out during direct chill casting process in an aluminium mill was reported. Soon thereafter industry led testing was performed to determine the root cause of the explosion. Upon determination of the root cause, an investigation to determine if any preventive measures could be instituted to prevent the explosions was conducted. Results found that a specific organic coating (e.g., Wise Chem E-212-F) prevented molten metal steam explosions, whereas some specific organic coatings initiated the explosions. The aluminium industry knows how to prevent molten aluminium steam explosions, but they still occur today. For instance, On August 20, 2007 in China at the Binzhou Weiqiao Aluminum Company, a molten aluminium steam explosion killed 9 workers and 64 injured. Could this catastrophe have been prevented? P11 - Organic Coatings to Prevent Molten Aluminum Water Explosions in Aluminum Cast Houses: Alex Lowery1; 1WISE CHEM LLC It was over 60 years ago; the first reported molten metal explosion from a bleed-out during direct chill casting in an aluminium mill was reported. Soon thereafter testing was performed to determine the root cause of the explosion. Upon determination of the root cause, an investigation to determine if any preventive measures could be instituted to prevent the explosions was conducted. Results found that a specific organic coating (e.g., Tarset Standard) prevented molten metal explosions, whereas some specific organic coatings initiated the explosions. Fifteen years ago the U.S. Department of Energy in conjuncture with the Aluminum Association reinvestigated the root cause of the molten metal explosions. Testing revealed that an initiation or trigger had to be present for a molten metal explosion to occur.

P13 - An Investigation on the Refinement Effect of Ti-6Al-4V on Ferich Hypo-eutectic Al-Si Alloys: Tara Foroozan1; A. Maniee1; Reza Taghiabadi1; 1International University of Imam Khomeini This study was conducted to investigate the refinement effect of Ti6Al-4V alloy on the structure and tensile properties of A356 alloy. Metal powder of Ti-6Al-4V was added to the Al alloy to attain 0.05, 0.1, 0.15 and 0.20 wt% remaining vanadium. It was found that the addition of Ti6Al-4V alloy resulted in the refinement of Fe-rich intermetallic platelets as well as the grain structure of the alloy. The optimum amount of the remaining vanadium which led to the best tensile properties was found to be 0.15 wt%. Under this condition, by more than 85 percent decrease in the average grain size and more than 80 percent decrease in the average lengths of Fe-rich platelets the tensile strength of 250 MPa was observed in modified alloy. This means 30 and 15 percent increase of the tensile strength compared to the base alloy and non-modified alloy, respectively. P14 - The Relationship between Dendrite Arm Spacing and Cooling Rate of Al-Si Casting Alloys in High Pressure Die Casting: Jae-Ik Cho1; Cheol-Woo Kim1; Young-Chan Kim1; Se-Weon Choi1; Chang-Seog Kang1; 1 Korea Institute of Industrial Technology The effects of cooling rate on the solidification behavior of Al-8.5%Si3%Cu and Al-11%Si-3%Cu alloys were studied during high pressure die casting (HPDC). The HPDC experiment was conducted by using the dies with 3 steps for 3 different cooling rates. Because of the high in both melt temperature and pressure, it was difficult to obtain the temperature profile directly from HPDC specimen. Therefore, in this study, cylindrical bar castings with different diameter were poured to acquire the cooling curves at the solidification range of 15°C/s up to 100°C/s and then the microstructures were compared to estimate the cooling rate in HPDC. The solidification characteristics including liquidus/solidus temperature and dendrite arm spacing of each alloy and each cooling rate was analyzed and the results showed strong proportional relationship between dendrite arm spacing and cooling rate in HPDC. The results were also compared with the actual die casting specimens and MAGMA simulation. P15 - Development and Characterization of an Al –Grid Metasurface on Conformal Geometry: Ildiko Peter1; Ladislau Matekovits1; 1 Politecnico di Torino Conformal, e.g. cylindrical, metasurfaces are even more diffused in different fields from optics to electromagnetics. Advanced applications as cloaking, i.e. making object invisible/transparent to incident fields, require high precision realizations, since the resonant answer of the system is very sensitive to the geometry. Practical realizations are sometimes limited by mechanical/material restrictions; multi- and inter-disciplinary interaction is mandatory to overcome such technological limits. Due to their excellent esthetic characteristics, good physical and mechanical properties, Aluminium is widely used for deposition on different substrate: physical and/or chemical vapor depositions are very suitable for micro-metallization process and for the realization of multilayered structures. This paper presents the results of a preliminary study on the surface morphology and mechanical properties of Al films deposited on a flexible, polymeric organosilicon compounds, in particular on polydimethylsiloxane (PDMS) substrates. The adhesion of the metal layers to the PDMS surface have been investigated by structural and morphological analysis.

13th International Conference on Aluminum Alloys

Posters

P12 - Experimental Study of Direct Squeeze Casting of Al-Si Alloy: Slim Souissi1; Mohamed Ben Amar1; Chedly Bradai1; 1ENIS-Sfax Squeeze casting is characterized by an applied pressure during solidification. It activates different physical processes which have metallurgical repercussions on the cast alloys. An experimental study showed the effect of the pressure levels on the microstructure and the mechanical behaviour of an Al-13%Si alloy. The results showed that the applied pressure ranging from 0.1 to 100 MPa refined the microstructure, improved the tensile properties and increased the hardness Vickers in the specimen centres. Beyond 100 MPa until 150 MPa, the alloy has

undergone a severe deformation in the presence of the high temperature, which generated a coarse microstructure. Consequently, the tensile properties and the hardness decreased. The scanning electron microscopy fractographs showed that the fracture mode of the squeeze cast specimens is more ductile up to 100 MPa pressure. This implies that the pressure is optimized to avoid degradation and segregation of the material during the elaboration process.

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P16 - The Effect of Chemical Composition and Structure on the Corrosion Resistance of Plated Aluminium Alloy Strips: Andrzej Klyszewski1; Janusz Zelechowski1; Mieczyslaw Opyrchal1; Marek Nowak1; Andrzej Frontczak2; Pawel Rutecki2; 1Institute of Non-Ferrous Metals; 2IMPEXMETAL SA, Huta Aluminium Konin Thin 3003 alloy strips plated with 4343 alloy were subjected to microstructure examinations, X-ray phase analysis, corrosion testing, and measurement of basic mechanical properties. In a similar manner, the properties of heat exchangers made from the plated strip were characterised, watching the long-term consequences of their use in vehicles. The results of investigations were applied in the manufacturing technology of thin plated strips for heat exchangers used by the automotive industry. P17 - Research on the Fatigue and Crack Initiation Behavior of Alloy 7449: Zi-qiao Zheng1; Shen Zhong1; Shi-chen Li1; Jin-feng Li1; 1Central South University This study mainly focused on the high-cycle fatigue behavior of 7449T7951 alloy. The fatigue-life tests were carried out over a range of stress amplitudes with the stress ratio(R) of 0.5 and -1.0 at room temperature for both smooth and notch specimens, respectively. Further researches were performed with the help of optical microscopy, scanning electron microscopy and transmission electron microscopy, in order to reveal the relationships between microstructure and fatigue crack initiation behavior. The results showed that 7449-T791 alloy had an excellent fatigue property. The fatigue limit(sN) of smooth specimens were 349 MPa for R=0.5 and 134 MPa for R=-1.0. while it still remained 138 MPa for R=0.5 and 70 MPa for R=-1.0 by using notch specimens with the notch factor(Kt) of 3.0. Its crack initiation behavior can be related to a joint influence of inclusions, precipitations, grain structures and their interactions with dislocations or persistent slip bands. P18 - Effects of Long Term Thermal Exposures on Degradation of Mechanical Properties in 5456-H116 and 5083-H116: Mohsen Seifi1; Justin Brosi1; John Lewandowski1; 1Case Western Reserve University 5xxx series Al-Mg alloys are solid solution strengthened alloys that can be further strengthened by cold working. However, thermal exposures for sufficient time/temperature combinations can promote the formation of a Mg-rich phase at the grain boundaries. Hardness testing, tensile testing, and fatigue crack growth experiments were conducted on 6.35 mm thick plate samples of 5456-H116 an 5083-H116 given thermal exposures for times of up to 10,000 h at 80C, 100C and 175 C, in addition to lower temperatures. Reductions in hardness and strength were accompanied by delamination in the S–T direction during fatigue, the extent of which was dependent on the thermal exposure and level of ΔK (and Kmax) employed. In addition, remediation heat treatments have been utilized on thermally exposed samples to remove/reduce such delamination. Subsequent effects of additional thermal exposures on the (re)appearance of delamination were also determined.

Posters

P19 - Effect of Staged Heat Treatment on Properties of Al-li Alloys: Dmitriy Ryabov1; Vladislav Antipov1; Nikolay Kolobnev1; Larisa Khokhlatova1; 1FSUE All-Russian Scientific Research Institute of Aviation Materials

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P20 - Microstructure and Mechanical Properties of an Electron Beam Welds in a Spray-Deposited Al-Zn-Mg-Cu Alloy: Feng Wang1; Yuting Zuo1; Baiqing Xiong1; Yongan Zhang1; Zhihui Li1; Hongwei Liu1; Xiwu Li1; 1Grinm In this study, an electron beam welds produced in a spray-deposited Al-8.6Zn-2.6Mg-2.2Cu (wt,%) alloy were characterized by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and tensile tests. It is found that the joint of the alloy contained three distinctive regions, i.e. fusion zone, heat affected zone and base metal region. Extensive microhardness measurements were conducted in the weld regions of the nuggets exhibited a hardness

loss in the fusion zone due to the loss of strengthening phases.Tensile properties of the joints were obtained by testing flat transverse tensile specimens, and the results indicated that tensile strength of these welds approached 82.3~85.3% of the base metal. The analysis of fracture surface has confirmed that the specimen fractured within the weld region during tensile test. P21 - Characterization of Damage Mechanisms during Bending of 6xxx Aluminium Automotive Sheets: Laurent Mattei1; Dominique Daniel2; Gilles Guiglionda3; Helmut Klocker1; 1Ecole Nationale Supérieure des Mines de Saint-Etienne; 2Constellium CRV; 3Constellium In present work, damage mechanisms during bending of 6xxx aluminum automotive sheets have been characterized experimentally and simulated by a mechanical model. Damage is controlled by the development of through thickness strain localization. The localization leads to the development of surface instabilities, splitting of the outermost grains and then crack propagation. Strain localization has been characterized by EBSD observations. The width of the strain localization bands, oriented in maximal shear direction, is controlled by the grain size. A 2D finite element (f.e.) model of the bending test was used to study strain localization. A random spatial variation of the yield stress allows explaining the strain localization, but the difference in bendability is controlled by the material behaviour and in particular strain hardening. Splitting of the outermost grains and crack initiation have been characterized experimentally by local strain maps. To explain this mechanism, a 3D crystal plasticity based finite element model of the plane strain tension test was used. The evolution of the glide directions was analysed. Grain splitting is controlled by interactions with first neighbour grains. P22 - Heat Treatment of Welded Joints Made on 7020 Alloy with the AlMg5 Alloy: Wojciech Szymanski1; Marzena Lech-Grega2; Sonia Boczkal2; Andrzej Klyszewski2; 1Institute of Non-Ferrous Metals ; 2 Institute of Non-Ferrous Metals The basic problem of joints welded from the high strength aluminium alloys hardened by heat treatment is a significant drop of the welded material properties in HAZ (Heat Affected Zone). The study examines changes in the properties and structure of HAZ in a welded joint deposited with the Al5Mg alloy on a 7020 alloy in the T6 condition. The impact of a two-stage heat treatment on structure and properties of HAZ was examined. Considerable degree of elimination of the HAZ effect on structure and properties of a welded joint was observed. For the 7020/Al5Mg welded joint, the mechanical properties comparable with the properties of 7020 alloy in T6 condition were obtained. Structure examinations were carried out by light microscopy and transmission electron microscopy, while mechanical properties were determined by hardness measurements and a static tensile test. An attempt was made to measure the residual stresses in an around-weld area. P23 - The Behavior of the Cordon of Weld of an Alloy of Aluminum 7075 T6 Welded by the TIG Process: Mustapha Temmar1; Mohamed Khatir1; 1University of Blida The mechanical properties of the alloys of aluminum 7075 T6 are partly related to the nature and to the proportion of the elements that compose them, and to their characters that encourage the formation and distribution of a and ß phases, or to precipitate new compounds often hardens during the process of TIG welding, a temperature gradient is created between the base metal and the melted zone. Thus, changes of the gradient of temperature are going to engender metallographic structures and diverse mechanical characteristics in various different zones. The characterization of the microstructure, because of the diversity of its components in terms of size and nature, require the use of multiple techniques of investigations It also requires the use of the tensile test and the impact strength test to assess the quality of the weld. The experiment plans method was used to compare the experimental results.

P24 - Age-hardening Behavior of MgB2 Particle Dispersed Al Alloy Composite Materials: Chihaya Kawamoto1; Kenji Matsuda1; Satoshi Murakami1; Daisuke Tokai1; Tokimasa Kawabata1; Yasuhiro Uetani2; Susumu Ikeno3; 1University of Toyama; 2Toyama Prefectural College; 3 Hokuriku Polytechnic College In previous work, aging behavior of SiC particle dispersed Al1mass%Mg2Si alloy composite material was investigated by microvickers hardness measurement and transmission electron microscopy. In the SiC particle dispersed composite materials, preferential precipitates on dislocations which had been introduced during quenching after solid solution treatment are observed. The age hardenability slighty decreased as compared with that of the matrix alloy. In this work, aging behavior of MgB2 particle dispersed Al-1mass%Mg2Si alloy composite material which including 4, 8 and 50 vol% MgB2 was investigated by hardness test and TEM observation. Diboride particle dispersed composite materials of 4vol% and 8vol% were indicated age hardening, while that of 50vol% wasn’t indicated . We will also report the result of TEM observation for precipitation in those composite materials. P25 - Production of the Al3Ti Foam by Microwave Heating: Tsuyoshi Yamamoto1; Makoto Kobashi1; Naoyuki Kanetake1; 1Nagoya University Al-Ti foams were produced by the combustion synthesis of blended powder compacts consisting of titanium and aluminum. Aiming at promoting the foaming behavior, the exothermic powder (titanium and B4C powders) was added to the blended powder to increase the combustion temperature. We examined the possibility of a microwave heating as the igniting method of a precursor. The effects of the exothermic powder addition and powder compacting pressure on the combustion foaming process were investigated. The microwave heating experiments were conducted by using a 500W, 2.45 GHz single-mode cavity. The precursors were heated in a maximum of electric field in the cavity. When the amount of the exothermic powder was 0 and 5vol%, combustion synthesis was identified, but the expansion of the precursor was not achieved. When the amount of the exothermic powder was 10vol%, the compacting pressure (25MPa ~ 200MPa) did not affect the porosity. P26 - Effects of Microalloying with Sn on the Precipitation Process of Al-3.5Cu-0.4Mg(wt%) Alloy: Jun Shu1; Zhiguo Chen1; Jishuai Zhang1; 1 Central South University The hardness test and transmission electron microscopy(TEM) have been used to investigate the effect of additions of Sn on precipitation processes in Al-3.5Cu-0.4Mg(wt%) alloy. It’s shown that a higher peak hardness can be obtained in the Sn-containing alloys. Additions of Sn into Al-Cu-Mg alloy stimulate the precipitation of θ’(Al2Cu). Many fine and uniform θ’ can be precipitated in underaged(15h),while the s phase (Al5Cu6Mg2) and O(Al2Cu) has been inhibited in Al-Cu-Mg-Sn alloy. The Sn microalloy effects can be attributed to the formation of insoluble Mg2Sn particles in AQ condition, which remove Mg atom from matrix. The removal of Mg leaves an insufficient of Mg so that precipitation of the s and O is inhibited. It seems the alloy matrix composition shifts toward the (a+θ+S) phase field to promote θ’ precipitate. In addition, θ’ and S phase in Sn-containing alloy exhibit a lower rate of coarsening at overaged condition.

P28 - Effect of Fe Content on the Transformation of Ferrous Phases in 6XXX Alloys during Homogenizing Annealing: Pavel Bryantsev1; Marina Samoshina1; 1National University of Science and Technology “MISiS” Aluminum alloys of 6XXX series based on the system Al-Mg-Si took first place in production among all aluminum alloys. The reason why these materials are so popular is the excellent combination of such properties as high strength and corrosion stability and the possibility of depositing various coatings by anodization and glazing. The only operation of heat treatment of these alloys before extrusion is homogenizing annealing. In the process of homogenizing annealing in addition to dissolution of the non-equilibrium particles of Mg2Si phase the transformation of needlelike β-Al5FeSi phase to α-Al8Fe2Si with more compact morphology is occur. It is recognized that the presence of needle particles of β-Al5FeSi in a billet for extrusion negatively affects the limit extrusion rate and surface quality of extrusions. This work is devoted to studying the effect of Fe content on the processes of ferrous phase transformations in dilute Al-Mg-Si-Fe alloys by methods of quantitative metallography. P29 - Evolution of Nanometer Precipitates in Al-Zn-Mg-Cu Alloy Subjected to Overaging Treatment and Warm Deformation: Yujing Lang1; Hua Cui1; Yuanhua Cai1; Jishan Zhang1; 1USTB The aim of this work was to develop a new processing method that can be utilized to refine grain structures. In order to produce sufficiently large dispersed precipitates to obstruct the dislocation sliding, the precipitation behaviors of an Al-Zn-Mg-Cu alloy during overaging and warm deformation were investigated. The results show that the size and quantity of the needle-like precipitates are increased with increasing aging temperatures and times during overaging. The strain can induce the dissolution of needle-like precipitates and the re-precipitation of the spherical and refined precipitates, which were wrapped around by the high density dislocation cells. The size and distribution of the precipitates and dislocation density were stable during the stress relaxation processing at 300 °C with a strain rate of 10 s-1. The sub-grains and fine-grained structures were obtained owing to the pinning effect of the precipitates, resulting in simultaneously improving of the strength and ductility. P30 - Precipitation Morphology and Tensile Properties of Al-0.62Mg0.32Si Alloy Aged at Low Temperature: Ryutaro Akiyoshi1; Ken-ichi Ikeda1; Masatoshi Mitsuhara1; Satoshi Hata1; Hideharu Nakashima1; Ken Takata2; Makoto Saga2; Kohsaku Ushioda2; Kenji Kaneko1; Masao Kikuchi1; 1Kyushu University, Japan; 2Nippon Steel Corporation, Japan The effects of aging on both tensile properties and microstructures of balanced Al-0.62Mg-0.32Si were investigated. Prior to the study, cold rolled sheets of the alloy were aged at 453 K for 20 h (sample A), 373 K for 120 h (sample BL), 373 K for 7200 h (sample BH), and 323 K for 14688 h (sample C). The Vickers hardness of samples A, BL and C were found almost the same as 75 HV. Needle-like β’’ precipitates about 50 nm in length and 4 nm in diameter were found in sample A, and Mg-Si clusters below 2 nm in sample BL and C. In addition, equiaxed nano-particles about 5 nm in length was found from sample BH with the maximum hardness HV=103. It was seen that the yield stress of the sample A and BH were higher than those of sample BL and C, and the dislocation motion were inhibited.

13th International Conference on Aluminum Alloys

Posters

P27 - Precipitation Processes in Al-Cu-Mg-(Si) Alloys in the a+S+T Phase Field: Zhiguo Chen1; Jun Shu1; Gang Sha2; Junhai Xia2; Shiyong Wang1; Simon Ringer2; 1Central South University; 2The University of Sydney The precipitation behaviors and age-hardening response of Al-1.5Cu4.0Mg(wt%) alloy microalloyed with Si have been investigated by means of hardness measurement, transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM).When compared to comparable ternary compositions, the quaternary alloy exhibits a higher hardness. It’s found that the underaged microstructure in the ternary Al1.5Cu-4.0Mg alloy contain some fine precipitation which has been proved as T phase by FFT spectra, and the peak aged microstrctures of ternary

alloy is dominated by T phase, while the peak hardness microstrctures of Si-containing alloys are dominated by S phase, and the volume fraction of S phase is found to increase as more Si is added.

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P31 - Microstructural Change and Mechanical Properties with Isochronal Aging in Al-Ni-Gd Metallic Glasses: Hideomi Kato1; Shoichi Hirosawa1; Kenji Matsuda2; Gary Shiflet3; 1Yokohama National University; 2Toyama University; 3University of Virginia Melt-spun Al-Ni-Gd metallic glasses have amorphous phase or the complex of a-Al nano-particles and amorphous phase. However, the change of the microstructure, and thus mechanical properties, with isochronal aging has not been studied sufficiently. In this study, to control the structure, type, size of matrix and precipitates by isochronal aging is aimed for the development of Al-Ni-Gd metallic glasses with higher strength and ductility. DSC results for Al90Ni3Gd7, Al87Ni7Gd6 and Al85Ni7Gd8 alloy ribbons showed three exothermic peaks in the temperature range RT to 673K. XRD analysis revealed that Al23Ni6Gd4 and Al19Ni5Gd3 intermetallic compounds are formed during isochronal aging, and increasing Ni and Gd contents increases the amount of the intermetallics. The nanoindentation hardness and Young’s modulus of the isochronallyaged specimens are higher than those of the as-spun specimens. Therefore, to improve mechanical properties of Al-Ni-Gd metallic glasses, increasing Ni and Gd contents as well as isochronal aging is quite important. P32 - Age-Hardening Behavior of Al-Mg2Si Alloys with Different Mn or Fe Contents: Shumei Wang1; Shanshan Chen1; Tokimasa Kawabata1; Susumu Ikeno2; Hidetoshi Takagi3; Koji Kawakita3; Kenji Matsuda1; 1 University of Toyama; 2Hokuriku Polytechnic College; 3SankyoMaterials Inc Transition metals (TMs) such as Cr, Fe and Mn, are usually added to Al alloys for grain refinement. We reported the effect of several TMs, i.e. Mn, Cr, Fe, Y and Gd, on the age-hardening behavior and microstructure of Al-Mg-Si alloys. In this work, we change the additional Mn or Fe content to investigate the variation of the age-hardening behavior for Al-Mg-Si alloys. According to the hardness test, TEM observation and DSC test, we know that the dispersoids are not observed in the alloys with small Mn or Fe contents. The formation of the dispersoids in the alloys with high Mn or Fe contents decreases the age-hardening ability of 0.25Mn and 0.2Fe alloys. On the other hand, small Mn addition enhances the formation of Mn-Si-vacancy. They are effective cluster for the homogeneous nucleation of GP zones and also increase the relative frequency of ß” phases in the alloys.

Posters

P33 - The Features of Phase Composition and Microstructure of Eutectic Piston Silumins AlSi12CuMgNi and AlSi12Cu2MgNi: Marina Samoshina1; Nikolay Belov1; 1National University of Science and Technology “MISiS” The system analysis of phase composition and microstructure of eutectic piston silumins on an example of alloys AlSi12CuMgNi and AlSi12Cu2MgNi has been carried out. Phase transformations in commercial alloys AlSi12CuMgNi and AlSi12Cu2MgNi are analyzed on the basis of polythermal sections of multicomponent phase diagrams Al-SiCu-Fe-Mn-Mg, Al-Si-Cu-Mg-Ni-Fe, Al-Si-Cu-Mg-Ni-Fe-Mn and Al-SiCu-Mg-Ni-Fe. Influence of various crystallization rates on microstructure and phase composition of studied alloys is investigated. Structural and phase transformations after annealing at temperatures 500°C, 520°C and 540°C are studied.

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P34 - TEM Observation of Precipitates in Ag-Added Al-Mg-Si Alloys: Takeshi Nagai1; Kenji Matsuda1; Tokimasa Kawabata1; Susumu Ikeno2; 1 University of Toyama; 2Hokuriku Polytechnic College The influence of addition of the small amount of transition metals to AlMg-Si alloy had reported by many researchers. In the previous our work, ß’ phase in alloys Al -1.0 mass% Mg2Si -0.5 mass% Ag (Ag-addition) and Al -1.0 mass% Mg2Si (base) were investigated by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED), in order to understand the effect of Ag. In addition, the distribution of Ag was investigated by energy filtered mapping and high annular angular dark field scanning transmission electron microscopy

(HAADF-STEM). One Ag-containing atomic column was observed per ß’ unit cell, and the unit cell symmetry is slightly changed as compared with the Ag-free ß’. In this work, the microstructure of G.P. zone and ß’’ phase was investigated by TEM observation, which were formed before ß’ phase. P35 - Effect of Ag and Cu Contents on the Age Hardening Behavior of Al-Zn-Mg Alloys: Katsumi Watanabe1; Tokimasa Kawabata1; Susumu Ikeno2; Tomoo Yoshida3; Satoshi Murakami3; Kenji Matsuda1; 1University of Toyama; 2Hokuriku Polytechnic College; 3Aisin keikinzoku Co., LTD. Al-Zn-Mg alloy has been known as one of the aluminum alloys with the good age-hardening ability and the high strength among commercial aluminum alloys. The ageing sequence has been generally accepted as G.P. zone - η ’ - η (MgZn2). The mechanical property of the limited ductility, however, is required to further improvement. In this work, three alloys, which were added Cu or Ag into the Al-Zn-Mg-Si alloy, were prepared to compare the effect of the additional elements on the aging behavior. The amount of Ag and Du were 0.2at% and 0.2at% respectively. The age hardening behavior and microstructures of those alloys were investigated by hardness measurement, high resolution transmission electron microscope(HRTEM) and selected area electron diffraction(SAED). Ag or Cu added alloys showed higher peak hardness than Ag or Cu free alloy. According to addition of Ag or Cu, the number of precipitates increased than Ag or Cu free alloy. P36 - Effect of Cu or Ag Addition on Tensile Deformation in Al-ZnMg Alloys: Naoya Miura1; Katsumi Watanabe1; Tokimasa Kawabata1; Yasuhiro Uetani2; Susumu Ikeno3; Tomoo Yoshida4; Satoshi Murakami4; Kenji Matsuda1; 1University of Toyama; 2Toyama Prefectural University; 3 Hokuriku Polytechnic College; 4Aisin keikinzoku Co., LTD. In this work, Al-Zn-Mg alloys, which were added with Cu or Ag, were prepared to compare the effect of the additional elements on tensile deformation. Hardness measurement, tensile test, SEM observation have been performed in order to understand the relationship between tensile deformation and crystallographic orientation of Al-Zn-Mg alloys. The addition of Cu or Ag increases the tensile strength of the alloy though decreases the elongation slightly comparing with the base alloy. P37 - HRTEM Observation of Precipitation in Cu and Ag Added Al-Mg-Si Alloys: Momoko Tokuda1; Kenji Matsuda1; Takeshi Nagai1; Tokimasa Kawabata1; Junya Nakamura2; Susumu Ikeno3; 1University of Toyama; 2University of Tohoku; 3Hokuriku Polytechnic College It has been known that Cu or Ag addition to Al-1.0mass%Mg2Si alloy shows higher hardness, strength and elongation than those of Al-1.0mass%Mg2Si alloy. In this study, the aging behaviour of Al1.0mass%Mg2Si alloys containing 0.35at%Cu (0.35Cu alloy), 0.35at%Ag (0.35Ag alloy), 0.2at%Cu-0.1at%Ag (0.2Cu-0.1Ag alloy) and 0.1at%Cu0.2at%Ag (0.1Cu-0.2Ag alloy) has been investigated by hardness measurement and HRTEM observation. 0.35Cu alloy has the highest maximum hardness. 0.1Cu-0.2Ag alloy has the shortest aging time to the peak hardness. 0.1Cu-0.2Ag alloy has the fast rate of age-hardening in the early period. 0.35Ag alloy has the finest microstructure at the peak hardness. The precipitates were classified into random-type, parallelogramtype, ß’-phase and Q’-phase using HRTEM image with different aging time. Relative frequency of all kind of precipitates changed by aging times. P38 - Effect of Cu or Ag Addition on Two-step Aging Al-Mg-Si Alloy: Yoshihisa Oe1; Kenji Matsuda1; Momoko Tokuda1; Takeshi Nagai1; Tokimasa Kawabata1; Susumu Ikeno; Susumu Ikeno2; 1University of Toyama; 2Hokuriku Polytechnique College The nucleation or stabilization of clusters which takes place during heating to ageing temperature must be considered not only for quenching effect but also for two – step aging effect. It has been known that Cuaddition or Ag-addition to Al-1.0mass%Mg2Si alloy (Al-Mg-Si-Cu alloy and Al-Mg-Si-Ag alloy) has higher hardness and elongation than those of Al-1.0mass%Mg2Si alloy. In this study, the aging behavior of Al-Mg-Si-

Cu alloy, Al-Mg-Si-Ag alloy and Al-Mg-Si alloy has been investigated by hardness test and TEM observation to understand the effect of Cu and Ag addition on two-step aging precipitation. The maximum hardness was becoming higher with increasing pre-aging time gets longer in Al-Mg-Si alloy. The aging time to the maximum hardness in Al-Mg-Si-Cu and AlMg-Si-Ag alloy pre-aged at 343K is longer than those only aged at 473K . P39 - Effect of Cold-Rolling on Age Hardening in Excess Mg-type Al-Mg-Si Alloys Including Some Minor Elements: Yurie Ogawa1; Kenji Matsuda1; Tokimasa Kawabata1; Yasuhiro Uetani2; Susumu Ikeno3; 1University of Toyama; 2Toyama Prefectural College; 3Hokuriku Polytechnique College It was known that transition metals improved the mechanical property of Al-Mg-Si alloy. The thermo-mechanical treatment is also effective to improve the strength of Al-Mg-Si alloy.In this work, the aging behavior of deformed excess Mg-type Al-Mg-Si alloy including Ag,Cu,Pt were investigated by hardness test and TEM observation. The value of maximum hardness increased and the aging times to reach maximum hardness become shorter by increase of the amount of deformation. The age-hardening ability (∆HV), (which is the difference between peak hardness and the hardness of as rolling condition,) was decreased with increasing amount of deformation. The effect of additional element on ∆HV was also similar to the result of amount of deformation described above. Comparing the value of maximum hardness of alloys aged at 423523K, the ex.Mg-Cu was the highest, the ex.Mg-Ag was middle, and the ex.Mg and ex.Mg-Pt were the lowest because of total amounts of added elements. P40 - Effect of Transition Metals on The Age-hardening Behavior of Al-Mg-Ge Alloys: Keisuke Matsuura1; Kenji Matsuda1; Tomoatsu Murakami1; Tokimasa Kawabata1; Yasuhiro Uetani2; Susumu Ikeno3; 1 University of Toyama; 2Toyama Prefectural University; 3Hokuriku Polytechnic College It is known that Al-Mg-Ge alloy shows the similar precipitation sequence to Al-Mg-Si alloy, and its equilibrium phase is ß-Mg2Ge according to its phase diagram. The influence of the small amount of transition metals in Al-Mg-Si alloys had been reported by many researchers. It was known that some transition metals improved the mechanical property of Al-MgSi alloys. In this work, several transition metals (Au, Ag and Cu) were selected and added to Al-1.0mass%Mg2Ge alloy. Tensile test and TEM observation were performed to investigate the age-hardening behavior of there alloy. We found that Al-Mg-Ge alloy including Ag showed a quick age-hardening rate at the initial aging stage, while Al-Mg-Ge alloy including Cu had the highest peak hardness and its tensile property was improved rather than Al-Mg-Ge alloy without Cu.

P43 - Influence of Silicon Addition on Precipitation Behavior in an Al-Cu-Mg Alloy: Xiwu Li1; Baiqing Xiong1; Yongan Zhang1; Feng Wang1; Yanqi Zeng1; Zhihui Li1; Baohong Zhu1; Hongwei Liu1; 1General Research Institute for Nonferrous Metals To meet the stringent requirements of heat-resistance products for aerospace applications, an Al-Cu-Mg-Si alloy containing a cubic s phase (Al5Cu6Mg2) with excellent high temperature stability was developed. In this work, Influence of silicon addition on aging precipitation behavior of an Al-4Cu-1.3Mg alloy was investigated by hardness and conductivity measurements and TEM analysis. The results indicated that a cubic phase, previously designated s phase, was obtained. The s phase was showed to be a (semi-)coherent and coplanar phase with the Al matrix, i.e.,{100} s//{100}Al and <100>s//<100>Al. In addition, S’ phase was observed. Silicon addition played an important role on the formation of s phase. Precipitation of s phase was observed in the silicon containing alloy for all the aging conditions studied but was absent in silicon-free alloy. And the content of silicon significantly influenced the volume fraction of s phase in the alloy. P44 - X-ray Diffraction Study on Lattice Constant of Supersaturated Solid Solution for Al Based Binary Alloys and Selected Al-Zn-MgCu Alloys: Zhihui Li1; Xiong Baiqing1; Zhang Yongan1; Li Xiwu1; Zhu Baohong1; Liu Hongwei1; Wang Feng1; Li Peiyue1; 1General Research Institute for Non-ferrous Metals The effects of Zn, Mg, Cu content on lattice parameters of the supersaturated solid solution of Al-Zn, Al-Mg, Al-Cu based binary alloys and three selected 7B04, 7050, 7B85 alloys were investigated by using X–ray diffraction pattern technique, and the effect of lattice distortion on the stability of the solid solution was attempted to describe the mechanism of quench sensitivity in age hardened Al-alloys. The results show that the lattice parameters of the Al-based solid solution influenced by the addition of main alloying elements Cu, Mg, Zn. With the increasing of Cu, Mg, Zn content in Al matrix, the lattice parameters of the Al-Cu, Al-Mg, Al-Zn based binary alloys solid solution decreased dramatically, rising rapidly and declined slightly, respectively. The effect sequence of alloying elements to lattice parameter of the 7000 series aluminum alloy solid solution was: Cu>Mg>Zn.

13th International Conference on Aluminum Alloys

Posters

P41 - Influence of 0.4Fe and 0.25%Si on the Formation of the GPB Zones in the Al-3%Cu-1%Mg Alloy: Kadi-Hanifi Mouhyddine1; Raho Azzeddine1; Chaieb Zoubir1; Ould Mohammed Ouarda1; 1University USTHB We know that a supersaturated Al-Cu-Mg solid solution stable at high temperature decomposes at lower temperature. When the ratio, number Cu atoms by number Mg atoms is close to 1, the pre-precipitation phase is formed by the Guinier-Preston-Bagaryatsky (GPB) zones and the decomposition occurs following the sequence [1]: (SSS)AlCuMg-----GPB zones-----S”-----S’------S where the GPB zones and the S” metastable phase are coherent with the matrix, S’ is the metastable phase semi-coherent and S, is the equilibrium precipitate icoherent with the matrix. In this work, the influence of the addition of 0.4%Fe and 0.25%Si on the formation of the GPB zones, is studied for Al-3%Cu-1%Mg in the temperature range 90----200°C.From the hardness isotherms we determine the life times of the GPB zones and its formation begining times. References [1] S.C.Wang, M.J.Starink and N.Gao, Scripta Materialia 547 (2006) 287-291

P42 - TEM Observation of Precipitates in Al-Mg-Ge Alloys with Different Mg2Ge Contents: Tomoatsu Murakami1; Kenji Matsuda1; Tokimasa Kawabata1; Susumu Ikeno2; 1University of Toyama; 2Hokuriku Polytechnic College It has been known that Al-Mg-Ge alloy shows the similar precipitation sequence to Al-Mg-Si alloy, and its equilibrium phase is ß-Mg2Ge according to its phase diagram. In this study, the precipitation sequence of Al-Mg-Ge alloys containing different contents of Mg2Ge has been investigated by hardness test, TEM and HRTEM observation to understand the effect of Mg2Ge contents on age-hardening behavior of these alloys. The hardness of as-quenched and peak-aged samples was improved by increasing with Mg2Ge contents. There was no big difference between peak hardness of the alloys with higher Mg2Ge contents aged at 423, 473 and 523K, which was different from the result of the alloys with lower Mg2Ge contents. The precipitates in the peak-aged samples have been classified as some metastable phases, such as the ß’-phase and parallelogram-type precipitates by HRTEM observation. The relative frequency of these precipitates in the matrix has been changed with Mg2Ge contents.

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P45 - Influence of Ti, B and Sr on the Tribological Properties of Forged A356 Alloy: Dayanand Mallapur1; K. Rajendra Udupa2; Shivaputrappa Kori3; Rajashekhar Kurahatti1; 1Basaveshwar Engineering College; 2 National Institute of Technology Karnataka; 3Visvesvaraya Technological University Effect of forging on the wear behavior of forged A356 alloy with and without the addition of grain refiner and modifier has been investigated under dry sliding conditions using a pin-on-disc wear testing machine. Forging was carried on A356 alloy using a pneumatic power forging hammer for analyzing the wear properties. Wear experiments were carried out at various normal pressures, sliding speeds and sliding distances. The tribological results reveal that a considerable decrease in the weight loss and frictional force was noticed as compared to the as cast A356 alloy and this would be due to the effect of forged and heat treated A356 alloy. Further, it is also observed that the weight loss of forged A356 alloy increases with increase in normal pressure and decreases with increase in sliding speed. Abrasive, oxidative, adhesive wear mechanisms are operative in different wear conditions. Keywords: Grain refinement, Modification, Wear, A356 alloy. P46 - A Conventional Thermo-Mechanical Process for Improving the Mechanical Properties of Al-Cu-Mg Alloy: Zhiguo Chen1; Jieke Ren1; Yujin Huang1; Jishuai Zhang1; 1Central South University A conventional thermo-mechanical process is developed to improve the mechanical properties of Al-Cu-Mg alloy. It is shown that the strength of the Al-Cu-Mg alloy is greatly increased while its high plasticity is maintained when the conventional thermo-mechanical process is applied to the alloy. The yield strength of the alloy is notably 100MPA higher than that of the alloys heat-treated with the generally used T3 process, and the elongation to failure reaches 16.5%, which is on a par with that of the conventional T3 heat-treated alloys (its elongation to failure is 16.8%). Aging and cold rolling is included in this new conventional thermo-mechanical process. A high density of complex including precipitates and dislocations should be the cause of the dramatic increasement in yield strength while its high plasticity is maintained.

Posters

P47 - The Phase Morphological Change of 7000 Series Aluminium Alloy Added Ni: Peng Gao1; Tietao Zhou1; 1Beihang University In this work Ni (5% and 10%) was added in 7050 aluminium alloy, which composite was prepared by melting reaction. The hardness of the composite increased obviously, from 180HV (7050) rise to 191.8HV (5%Ni) and 236.4HV (10%Ni) after T6 aging. From fracture analysis the fracture behavior was mainly brittle fracture and interfaces detachment. The experiments were designed to refine the Al3Ni hard brittle particles through deformation and heat treatment. After long time annealing, Al3Ni phases could be refined and spheroidizied obviously, the hardness first increased and then decreased with time prolonged. Also after multi-step Hot/Cold rolling, the particles were smashed from original long slab to nearly isometric particles progressively.

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P48 - Effect of Alloy Elements on Microstructures and Mechanical Properties in Al-Mg-Si Alloy: Yoshikazu Katoh1; Koji Hisayuki1; Masashi Sakaguchi1; Kenji Higashi2; 1Showa Denko K.K.; 2Osaka Prefecture University Because the formability and corrosion resistance of Al-Mg-Si alloy is better than high strength alloy like Al-Cu alloy is widely used for structures and components of cars. However, since there is a tendency for elongation to decrease according to increase content of main elements generally, it is not used in a form as Al-Mg-Si alloy. So, it aimed at production of material which has high strength in this research, maintaining elongation. After casting based on Al-Mg-Si (500ppm Fe) alloy billet was extruded and heat-treated at T6, and investigated effects of alloy elements and their contents on microstructures and mechanical properties. Chemical composition of alloy which has high strength was determined. Moreover,

influences of process conditions were investigated by using selected alloy. As these results, relationship between microstructures and mechanical properties was cleared in part and microstructures to achieve mechanical properties at the same level as Al-Cu alloy were proposed. P49 - Deformation Behavior of Semi-Solid A356 Alloys during Compression at Elevated Temperature and its Thixo-Extrusion: Dae-Hwan Kim1; Guen-Ho Van1; Hee-Kyung Kim1; Su-Gun Lim1; 1, Gyeongsang National University, i-Cube Center, Engineering Research Institute The deformation behavior of semi-solid A356 alloys by cooling slope during compression test under strain rate of 1.0 x 10-3 in a temperature range was investigated and thixo-extrusion with a ram speed of 4 mm/ sec and extrusion ratio of 27 in mushy zone temperature range of this alloy was performed. In order to observe the microstructural phenomena of a compressed and extruded semi-solid A356 alloys with different deformation temperature, first, the deformed structures were cut. And then, the sectioned specimen was prepared by the conventional methods for microstructural observations on an optical and scanning electron microscopy. And mechanical properties of extruded round bars were measured by tensile test at a strain rate of 1.0 10-3s-1. The results show that the microstructure of semi-solid A356 alloys by cooling slope was composed with an equiaxed and refined grains, which were grown by high reheating temperature during the reheating for thixo-extrusion. P50 - A Study on Thermal-Conducting, Mechanical and SurfaceTreating Characteristics of Al-Zn-Mg Alloys: Je Sik Shin1; Sangmok Lee1; Kitae Kim1; Sehyun Ko1; 1Korea Institute of Industrial Technology 7072 aluminum alloy, one of Al-Zn-Mg base aluminum alloy, has been used in automobile heat exchanger such as inner liner materials of header and tube parts, pin and etc. The materials for automobile heat exchanger have to meet the highest combination of thermal conductivity, strength, formability and etc, because the size of component and the gauge of the used materials must be reduced for weight reduction of vehicles, keeping sufficiently high thermal dissipation efficiency. Therefore, in this study, it was tried to modify the chemical compositions of 7072 aluminum alloy to optimize the thermal-conducting, mechanical, and surface treating characteristics. Mg content was systematically changed up to 0.5% and the eleements detrimental to thermal conductivity and brazability were minimized. The thermal conductivity, tensile properties, and anodic characteristic of the developed Al-Zn-Mg alloys were evaluated after casting, solid solution treatment, hot rolling, intermediate annealing, cold rolling and stress relief annealing, respectively. P51 - The Influence of Grain Structure on the Ductile Fracture Mode of Extrusion Weld Seams: Andrew Den Bakker1; Laurens Katgerman2; 1 Other; 2TU Delft Longitudinal weld-seams are always present in aluminium extrusions produced with porthole dies, as a result of an elevated temperature solidstate bonding process of the rejoining of metal streams inside the extrusion tooling, occurring under conditions of interfacial pressure and plastic deformation. It is desired that these weld-seams have similar mechanical properties as the bulk material, in this respect typified by a favourable transgranular ductile fracture mode. In this paper the influence of the grain structure and texture effects on the ductile fracture characteristics is presented. In lab-scale experiments, box-section extrusions were produced, having either a non-recrystallised, fibrous microstructure or a fully recrystallised microstructure, achieved by processing alloys with and without dispersoid-forming elements under pre-defined sets of otherwise unchanged processing conditions. Mechanical assessment of coupons with and without a weld seam was performed, focusing on the ductility aspects. Results were correlated with the grain structures, characterized though orientation image analysis and fracture surface analysis.

P52 - Dispersion Hardening Effect of Dispersoids in 3xxx Al Alloys With Varying Manganese and Silicon Contents: Eva Mørtsell1; Astrid Marie Muggerud1; Yanjun Li2; Randi Holmestad1; 1NTNU; 2Sintef The goal of this project is to quantify the amount, distribution and composition of particles/dispersoids in four selected AA3XXX aluminium alloys with high and low Si content at different heat treatments. For non-heat treatable alloys the strengthening occurs from solid solution formation, second phase microstructural constituents, dispersoids and/ or strain hardening. The microstructure is correlated with mechanical properties such as hardness, electrical conductivity and tensile properties. The samples studied are isothermally annealed at temperatures between 350 and 450°C and then quenched to room temperature after holding times of 0h, 1h, 4h, 8h, 24h and 48h. The heating rate was 50°C per hour, starting from room temperature.The main investigation tool is advanced analytical Transmission Electron Microscopy together with Electron Energy Loss Spectroscopy for determining the thickness of the samples in question. Quantitative measures of size, density and volume fraction of dispersoids are related to the measured mechanical properties. P53 - Effect of Hot Extrusion Conditions on the Microstructure of AA3003: Lina Grajales1; Warren Poole1; Yahya Mahmoodkhani2; Mary Wells2; Nick Parson3; 1University of British Columbia; 2Univeristy of Waterloo; 3Arvida Research and Development Centre There is significant interest in the microstructural development during extrusion of AA3xxx aluminum alloys, which are used in heat exchanger applications. The ability to control deformation conditions allows for the design of the microstructure so that the material properties can be tailored to the final component. A systematic study of processing conditions for AA3003 was conducted using a laboratory scale fully instrumented extrusion press. Billets previously homogenized at different conditions were extruded with a variety of extrusion ratios and ram speeds. Extrusion samples were characterized with the use of optical microscopy. A full range of microstructures from recrystallized to unrecrystallized, with a wide range of final grain sizes and spatial variation were obtained. The results have been rationalized in comparison with processing conditions from the trials. P54 - Effect of Iron and Silicon on Strength and Electrical Resistivity of Al-Zr Wire Alloys: Alexander Alabin1; Nikolay Belov1; 1MISIS We have studied the effect of iron (up to 0.3 wt.%) and silicon (up to 0.2 wt.%) on the structure, electrical resistivity and strength of Al-Zr wire alloys (up to 0.70 wt.% Zr) after various annealing regimes. The phase composition of the Al–Zr–Fe–Si system was analyzed with respect to newgeneration heat resistant wire aluminum alloys. By the use of Thermo-Calc software we calculated the solubilities of Zr, Fe and Si in aluminum solid solution-(Al) and volume fractions of all possible phases (including Al3Zr -L12 nanoparticles) at various temperatures. In contrast with unalloyed aluminium (AA1350) silicon addition to Al-Zr alloys allows to obtain an optimal combination of electrical and mechanical properties. By the use of desirability function it is shown that all experimental Al-Zr alloys have the best combination of strength, electrical resistance and thermal stability after technological process with intermediate annealing.

P56 - Influence of the Chemical Composition on the Structure and Properties of Lead-Free Machinable AA6023 (Al-Mg-Si-Sn-Bi) Alloy: Jiri Faltus1; Miroslav Karlik2; Petr Haušild2; 1Research Institute for Metals; 2Czech Technical University in Prague Microstructure and properties of extruded rods of a new machinable lead-free aluminum AA6023 (Al-Mg-Si-Sn-Bi) alloy having different levels of Mg content were characterized. In the structure of the alloy there are low-melting point particles containing Sn+Bi. During machining, the temperature generated in the cutting zone is high enough to melt these dispersed entities. This melting gives rise to a local loss of the material strength and ductility which in turn leads to the formation of short, discontinuous chips. In addition to tin and bismuth, some of the Sn+Bi particles contain also a high amount of magnesium and intermetallic compounds of Mg2Sn and Mg3Bi2 are thus formed. The presence of these stable phases increases the melting temperature of Sn+Bi containing particles and their originally positive impact on improving the machinability is therefore reduced. Hence increasing of Mg content in the Al-Mg-Si-Sn-Bi alloy reduces its machinability. P57 - Effect of Thermomechanical Treatment on Sag Resistance of Roll-Bonded High Strength Aluminum Clad Sheets: Kwangjun Euh1; Hyoung-Wook Kim1; Suk Bong Kang1; 1Korea Institute of Materials Science Lightweight aluminum clad sheets are widely used for brazing materials in the automotive heat exchangers. In order to achieve further light-weight of the components, thinner brazing sheets with high strength is required, where the strength of the clad sheet is proportional to that of the core alloy. In the present study, strip-cast aluminum alloys having high strengths are used as core alloys for aluminum clad sheets. The high strength clad sheets are fabricated by the roll bonding process and further cold-rolled down to the thickness of 0.08 mm. Cold rolling is interrupted by full annealing at the different amount of reductions in order to obtain the thin aluminum clad sheets with different final reductions. The effect of thermomechanical treatment on the sag resistance of high strength aluminum clad sheet is elucidated by means of microstructural analysis. P58 - Homogenisation of 6xxx Alloy Ingots with an Addition of Vanadium: Marzena Lech-Grega1; Wojciech Szymanski1; Mariusz Bigaj1; Maciej Gawlik1; 1Institute of Non-Ferrous Metals The selection of material for elements operating in the crumple zone should consider the mechanical properties of alloys and their ability to absorb energy. Undoubtedly, such materials include aluminium alloys with an addition of vanadium. The aim of this study was to evaluate the impact of homogenisation conditions on the structure and properties of ingots cast by DC technique at different solidification rates from alloys included in the 6xxx series, such as AlMgSi and AlMgSiCu with an addition of 0.2 wt% and 0.4 wt% vanadium. The alloy structure was examined by light microscopy and scanning electron microscopy combined with an EDX analysis. Changes in mechanical properties were determined by hardness measurements and static compression test after different time/temperature variants of the homogenising treatment. Optimum parameters of the homogenising process were determined for the examined ingots and an extension of the homogenisation time was considered justified only for ingots containing Cu.

13th International Conference on Aluminum Alloys

Posters

P55 - Effect of Prior State on the Microstructural Evolution in a Al-Cu-Mg-Ag Alloy during ECAP at 250°C: Marat Gazizov1; Rustam Kaibyshev1; 1Belgorod State University The effect of prior state on evolution of deformation microstructure and phase composition during equal channel angular pressing (ECAP) of an Al-Cu-Mg-Ag alloy with small additions of zirconium and scandium was studied in present paper using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray analysis. ECAP was conducted at 250°C by using route BC to strains ranging from 1 to 12. It was found that optimal prior state for subsequent deformation is overaging at 380°C for 3 h. In this condition after 12 passages of pressing the formation

of recrystallized structure with fraction of high angle boundaries (HAB) of ~0.7, average misorientation angles of ~33° and grain size of ~1 µm are observed. In case of overaging the precipitation of particles of the stable S-phase (Al2CuMg) and Ag-enriched phases were observed after pressing to strain ranging from 1 to 12. The effect of different types of the particles on dynamic recrystallization (DRX) mechanisms and opportunity of static recrystallization (SRX) evolution due to particle stimulated nucleation (PSN) are discussed in detail.

103

P59 - An Effect of Thermomechanical Treatment on Properties and Structure of Al-Cu- Li-Zn Alloy Plates: Michail Oglodkov1; 1FSUE AllRussian Scientific Research Institute of Aviation Materials The present work was focused on definition of an effect of thermomechanical treatment (value and type of deformation applied after quenching and conditions of multistage ageing) on structure, mechanical properties and fracture toughness of V-1461 alloy. Deformation of 1260mm thick plates made from V-1461 alloy applied prior to artificial ageing causes a substantial increase in volume fraction of the main nonequilibrium T1 and S phases precipitated in grains due to growing density of dislocations and low-angled sub-boundaries. It results in additional strengthening of alloy without loss of ductility (UTS > 540 MPa, 0.2%YS > 490 MPa, El. > 8%). As compared with peak ageing, homogeneous precipitation of a big volume of delta and tetta phases occurred due to temperature reduction and exposure prolongation in the course of stepped ageing prevents undesirable T1 and S phases precipitation along grain boundaries and favours an improvement in fracture toughness (KIC > 47 MPavm).

Posters

P60 - Effect of Subsequent Annealing on the Microstructure Stability of Friction Stir Processed AA5052 Alloy: Peter Kalu1; M. AdamsHughes2; 1FAMU-FSU College of Engineering; 2Formerly of FAMU-FSU College of Engineering, now at Proctor & Gamble Thermal stability of Friction Stir Processed (FSP) microstructure has been studied in AA5052 alloy that was processed using a fixed FSP tool size and geometry at rotation speed ranging from 400 – 1200 rpm, and traverse speed of 1 – 3 ipm. These processed materials were annealed for 1 hour in air at temperatures ranging from 250°C to 450°C and analyzed using polarized optical microscopy (POM), Orientation Imaging Microscopy (OIM) and Vickers microhardness testing. Because the asprocessed material was inhomogeneous and complex, the subsequent microstructure upon annealing was equally inhomogeneous, complex and dependent on the (i) prior inhomogeneity, (ii) processed parameters, such as rotation speed (), and feed speed (), and (iii) annealing temperature. Just like in the as-received material, there was no evidence of recrystallization in the processed materials for annealing at temperatures lower than 300oC. In general, higher processing rotation speed resulted in the decrease of stored energy for recrystallization during subsequent annealing. Higher feed speed leads to higher straining during FSP, which in turn results in a finer recrystallized grain size on subsequent annealing. Although the first sign of recrystallization was observed at the Flow arm region, the grain size in this region remained fine even when other regions have very large grains. This clearly indicates that the Flow arm suffered the largest deformation, and that nucleation of recrystallization in this region was on multiple sites.

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P61 - The Mould Characteristics of Ngwo Foundry Sand: Emmanuel Nwonye1; Basil Okorie2; 1Scientific Equipment Development Institute; 2 Enugu state University of Science and Technology, Enugu. This project work investigated the mould characteristics of Ngwo foundry sand, such as the moisture content, bulk density, flowability, permeability, shatter index, green compression strength, green shear strength, dry compression strength, dry shear strength, hot compression strengths at various temperatures ranging from 6000°C to 15000°C, hot shear strength at temperatures mentioned above, thermal linear expansion at temperatures from 1000°C to 9000°C, and in addition, refractoriness of the foundry sand was determined at temperatures ranging from 2000°C to 15000°C. This work also characterized the said foundry sand to ascertain its chemical composition, A thorough review of literature was carried out and comparison made between the existing values and those obtained from the experimental research work. The experimental results show that Ngwo foundry sand is good for casting both ferrous and non ferrous metals. Practical trials carried out on a small casting showed excellent surface finish.

P62 - Effect of Starch on the Mould Characteristics of Ngwo Foundry 1 Sand: Emmanuel Nwonye1; Jeorom Odo2; Scientific Equipment Development Institute; 2Nnadi Zikiwe University, Awka This research examined the mould characteristics of Ngwo foundry sand, such as the moisture content, bulk density, flowability, permeability, shatter index, green compression strength, green shear strength, dry compression strength, dry shear strength, hot compression strengths at various temperatures ranging from 6000C to 15000C, hot shear strength at temperatures mentioned above, thermal linear expansion at temperatures from 1000C to 9000C, and in addition, refractoriness of the foundry sand was determined at temperatures ranging from 2000C to 15000C. This work also characterized the said foundry sand to ascertain its chemical composition, and also investigated the effect of starch addition on the properties of the sand under the temperature conditions mentioned above. The experimental research results show that Ngwo foundry sand is good for casting, while Practical casting trials carried out showed excellent surface finish. P63 - Effect of Quenching Condition on Aging of Dilute Al-Ag Alloy: Teruto Kanadani1; Keiyu Nakagawa; Akira Sakakibara2; Koji Murakami3; Makoto Hino; 1Okayama University of Science; 2Okayama University; 3 Industrial Technology Research Institute of Okayama Prefecture GP zones in Al-Ag alloys have been studied extensively by many workers, but little attention have been paid to the conditions of quenching by which super-saturated solid solution would be obtained. In this paper, aging of dilute Al-Ag alloy at 273K after quenching under various conditions was studied by measurement of electrical resistivity. Scattering of the quasiequilibrium value of resistivity (ρe) was not random but closely related to the as-quenched value (ρ0) ; ρe increased with increasingρ0 . When the quenching temperature (Tq) was lower than or equal to 773K, the state atρe was controlled substantially by tha concentration of quenched vacancy. On the other hand, when Tq>823K, GP zones formed during quenching played an important role, instead of quenched vacancies, in determining the state. P64 - The Evolution of Homogeneity on Transverse Cross-section of an Al Alloy Deformed by Twist Extrusion: Shahab Ranjbar Bahadori1; S. A. Asghar Akbari Mousavi1; 1University of Tehran The effects of employing thermomechanical processing were compared with the effects of performing repeated passes of twist extrusion on homogeneity of transverse section of aluminum 2011 samples. Conducting repeated passes of twist extrusion increased the microstructure and mechanical homogeneity. However, performing different thermomechanical processes, including natural and artificial aging and subsequent passes of twist extrusion created specimens noticeably more homogeneous. The coarse precipitates of the center region of the transverse cross-section reduced the grain size more than the finer precipitates of the corner zone. On the other hand, the refinement of grain size at the corner was more intensive than that at the center due to the strain distribution pattern of twist extrusion. Hence, consequent of these two inverse phenomena resulted in a homogenous grain distribution. Moreover, the balance of two different strengthening mechanisms of grain size and second-phase particles at the center and corner caused a mechanically homogenous section.

A Aagesen, L. . . . . . . . . . . . . . . . . . . . . 57 Abe, S . . . . . . . . . . . . . . . . . . . . . . . . 42 Abu-Farha, F. . . . . . . . . . . . . . . 51, 94 Adachi, H. . . . . . . . . . . . . . . . . . . . . . 96 Adams-Hughes, M. . . . . . . . . . . . 104 Ahmadi, M . . . . . . . . . . . . . . . . . . . . 70 Aizawa, T. . . . . . . . . . . . . . . . . . . . . . 40 Ajersch, F. . . . . . . . . . . . . . . . . . . . . . 91 Akbari Mousavi, S . . . . . . . . . . . . 104 Akiyoshi, R . . . . . . . . . . . . . . . . 80, 99 Alabin, A. . . . . . . . . . . . . . . . . 66, 103 Alinaqian, Y . . . . . . . . . . . . . . . . . . . 68 Alkahtani, S. . . . . . . . . . . . . . . . 39, 62 Allen, T . . . . . . . . . . . . . . . . . . . . . . . 67 Allison, J . . . . . . . . . . . . . . . 70, 78, 87 Alpas, A. . . . . . . . . . . . . . . . . . . . . . . 69 Andersen, S. . . . . . . . . . . . . 40, 47, 71 Ando, M. . . . . . . . . . . . . . . . . . . . . . . 68 Antipov, V. . . . . . . . . . . . . . 57, 62, 98 Antoniac, I. . . . . . . . . . . . . . . . . . . . . 67 Antrekowitsch, H. . . . . . . . . . . . . . . 75 Apelian, D. . . . . . . . . . . . . . . . . 88, 93 Arnberg, L. . . . . . . . . . . . . . . . . . . . . 72 Asadi, M. . . . . . . . . . . . . . . . . . . . . . . 68 Asghar, Z. . . . . . . . . . . . . . . . . . . . . . 82 Ashida, M . . . . . . . . . . . . . . . . . . . . . 62 Asholt, P. . . . . . . . . . . . . . . . . . . . . . . 72 Asle Zaeem, M . . . . . . . . . . . . . . . . . 57 Ataei, A . . . . . . . . . . . . . . . . . . . . . . . 49 Atsuta, K . . . . . . . . . . . . . . . . . . . . . . 52 Azzeddine, R. . . . . . . . . . . . . . . . . 101

B

C Cai, E . . . . . . . . . . . . . . . . . . . . . . . . 60 Cai, Y . . . . . . . . . . . . . . . . . . . . . . . . 99 Campbell, J . . . . . . . . . . . . . . . . . . . . 50 Cao, L . . . . . . . . . . . . . . . . . . . . . . . . 70 Caron, E. . . . . . . . . . . . . . . . . . . . . . . 84 Carpenter, A . . . . . . . . . . . . . . . . . . . 86 Carron, D. . . . . . . . . . . . . . . . . . . . . . 71

Cassada, W . . . 38, 39, 40, 42, 43, 44, . . . . . . . 45, 47, 48, 50, 51, 53, . . . . . . . 54, 56, 57, 58, 60, 61, . . . . . . . 62, 63, 64, 66, 68, 69, . . . . . . . 70, 71, 72, 73, 74, 75, . . . . . . . 76, 77, 78, 79, 80, 81, . . . . . . . 83, 84, 85, 86, 87, 88, . . . . . . . 89, 90, 91, 92, 93, 94, . . . . . . . . . . . . . . . . . . . . . . . . 96 Cazottes, S. . . . . . . . . . . . . . . . . . . . . 59 Cerri, E. . . . . . . . . . . . . . . . . . . . 40, 89 Chabal, R. . . . . . . . . . . . . . . . . . . . . . 55 Champagne, V . . . . . . . . . . . . . 43, 87 Chang, C . . . . . . . . . . . . . . . 45, 64, 87 Chang, S. . . . . . . . . . . . . . . . . . . . . . . 96 Chaves, C. . . . . . . . . . . . . . . . . . . . . . 77 Cheeseman, B. . . . . . . . . . . . . . . . . . 59 Chen, C . . . . . . . . . . . . . . . . . . . . . . . 84 Chen, D . . . . . . . . . . . . . . . . . . . . . . . 94 Chen, J. . . . . . . . . . . . . . . . . . . . 61, 92 Chen, Q . . . . . . . . . . . . . . . . 65, 73, 79 Chen, R . . . . . . . . . . . . . . . . . . . . . . . 41 Chen, S. . . . . . . . . . . . . . . . . . . 41, 100 Chen, X . . . . . . . . . . . . . 46, 85, 90, 91 Chen, Y . . . . . . . . . . . . . . . . . . . 42, 60 Chen, Z . . . . . . 45, 65, 72, 73, 99, 102 Cheverikin, V . . . . . . . . . . . . . . . . . . 64 Chevy, J . . . . . . . . . . . . . . . . . . . . . . . 58 Chin, E. . . . . . . . . . . . . . . . . . . . . . . . 53 Chobaut, N . . . . . . . . . . . . . . . . 71, 91 Choi, S . . . . . . . . . . . . . . . . . 60, 96, 97 Cho, J . . . . . . . . . . . . . . 41, 66, 96, 97 Cho, K . . . . . . . . . . . . . . . . . . . . . . . . 44 Cho, Y . . . . . . . . . . . . . . . . . . . . . . . . 92 Chrzan, J . . . . . . . . . . . . . . . . . . . . . . 92 Chu, M. . . . . . . . . . . . . . . . . . . . 38, 48 Coleman, P . . . . . . . . . . . . . . . . . . . . 76 Colley, L. . . . . . . . . . . . . . . . . . . . . . . 64 Colvin, E . . . . . . . . . . . . . . . . . . . . . . 77 Cooper, L. . . . . . . . . . . . . . . . . . . . . . 89 Coral-Escobar, E. . . . . . . . . . . . . . . . 86 Couper, M. . . . . . . . . . . . . . 48, 70, 88 Cox, B . . . . . . . . . . . . . . . . . . . . . . . . 50 Crump, J . . . . . . . . . . . . . . . . . . . . . . 50 Cubero-Sesin, J. . . . . . . . . . . . . . . . . 55 Cui, H . . . . . . . . . . . . . . . . . . . . . . . . 99 Cui, J . . . . . . . . . . . . . . . . . . . . . . . . 38

D Dahle, A. . . . . . . . . . . . . . . . . . . . . . . 84 Dahl, Ø. . . . . . . . . . . . . . . . . . . . . . . . 40 Dai, C . . . . . . . . . . . . . . . . . . . . . . . . 88

13th International Conference on Aluminum Alloys

Index

Babaghorbani, P. . . . . . . . . . . . . . . . 73 Babcsán, N. . . . . . . . . . . . . . . . . . . . . 53 Babich, E . . . . . . . . . . . . . . . . . . . . . . 81 Bach, F. . . . . . . . . . . . . . . . . . . . 64, 82 Bahrami, A . . . . . . . . . . . . . . . . 49, 84 Baiqing, X . . . . . . . . . . . . . . . . . . . 101 Balle, F. . . . . . . . . . . . . . . . . . . . . . . . 50 Banhart, J. . . . . . . . . . . . 45, 56, 64, 87 Baohong, Z . . . . . . . . . . . . . . . . . . 101 Baohua, N . . . . . . . . . . . . . . . . . 73, 93 Baptiste, D. . . . . . . . . . . . . . . . . . . . . 60 Barker, S. . . . . . . . . . . . . . . . . . . . . . . 58 Barr, A . . . . . . . . . . . . . . . . . . . . . . . . 52 Baserinia, A. . . . . . . . . . . . . . . . . . . . 84 Basu, B. . . . . . . . . . . . . . . . . . . . . . . . 58 Bavarian, B . . . . . . . . . . . . . . . . . . . . 85 Becirovic, A. . . . . . . . . . . . . . . . . . . . 52

Becker, C. . . . . . . . . . . . . . . . . . . . . . 79 Beke, S. . . . . . . . . . . . . . . . . . . . . . . . 53 Belov, N. . . . . . . . . . . . . . 66, 100, 103 Belsito, D. . . . . . . . . . . . . . . . . . . . . . 87 Ben Amar, M. . . . . . . . . . . . . . . . . . . 97 Berneder, J. . . . . . . . . . . . . . . . . 72, 74 Bès, B . . . . . . . . . . . . . . . . . . . . . . . . 58 Bezençon, C. . . . . . . . . . . . . . . . . . . 64 Bigaj, M. . . . . . . . . . . . . . . . . . . . . 103 Biradar, N . . . . . . . . . . . . . . . . . . . . . 90 Birbilis, N. . . . . . . . . . . . . . . 66, 75, 85 Bjørge, R . . . . . . . . . . . . . . . . . . . . . . 47 Blais, C. . . . . . . . . . . . . . . . . . . . 59, 82 Blicharski, M. . . . . . . . . . . . . . . . . . . 55 Bocher, P. . . . . . . . . . . . . . . . . . 40, 52 Boczkal, S. . . . . . . . . . . . . . . . . . . . . . 98 Bois-Brochu, A. . . . . . . . . . . . . 59, 82 Bolez, M. . . . . . . . . . . . . . . . . . . . . . . 70 Bollmann, C . . . . . . . . . . . . . . . . . . . 46 Boltz, Y. . . . . . . . . . . . . . . . . . . . . . . . 75 Booth-Morrison, C . . . . . . . . . . . . . 56 Boselli, J. . . . . . . . . . 42, 59, 77, 82, 91 Bouaicha, A. . . . . . . . . . . . . . . . . . . . 75 Bouazara, M . . . . . . . . . . . . . . . . . . . 75 Bouvier, V. . . . . . . . . . . . . . . . . . . . . 65 Bovard, F. . . . . . . . . . . . . . . . . . . . . . 92 Bradai, C . . . . . . . . . . . . . . . . . . . . . . 97 Brahme, A. . . . . . . . . . . . . . . . . 51, 69 Bratberg, J. . . . . . . . . . . . . . . . . . . . . 79 Bray, G. . . . . . . . . . . . . . . . . . . . 59, 77 Brinkman, H. . . . . . . . . . . . . . . 70, 87 Brochu, M. . . . . 42, 48, 57, 59, 82, 91 Brockenbrough, J . . . . . . . . . . . . . . . 50 Brodusch, N . . . . . . . . . . . . . . . . . . . 48 Brosi, J. . . . . . . . . . . . . . . . . . . . . . . . 98 Brüggemann, T. . . . . . . . . . . . . . . . . 79 Bryant, D. . . . . . . . . . . . . . . . . . . . . . 88 Bryant, J. . . . . . . . . . . . . . . . . . . . . . . 88 Bryantsev, P. . . . . . . . . . . . . . . . . . . . 99 Bucci, R . . . . . . . . . . . . . . . . . . . 58, 68 Buchheit, R . . . . . . . . . . . . . 66, 75, 85 Buffiere, J. . . . . . . . . . . . . . . . . . . . . . 59 Bunkholt, S . . . . . . . . . . . . . . . . . . . . 65

105

Daniel, D. . . . . . . . . . . . . . . . . . . . . . 98 Danielou, A. . . . . . . . . . . . . . . . . . . . 59 Daniélou, A. . . . . . . . . . . . . . . . . . . . 58 Darlapudi, A . . . . . . . . . . . . . . . . . . . 84 Davidkov, A. . . . . . . . . . . . . . . . . . . . 86 Davies, C . . . . . . . . . . . . . . . . . . . . . . 70 Davydov, V . . . . . . . . . . . . . . . . 56, 91 Dechamps, A. . . . . . . . . . . . . . . . . . . 72 De Geuser, F . . . . . . . . . . . . 54, 71, 72 Degischer, H . . . . . . . . . . . . . . . . . . . 53 Delacroix, J . . . . . . . . . . . . . . . . . . . . 59 Den Bakker, A. . . . . . . . . . . . . . . . 102 Denzer, D. . . . . . . . . . . . . . . . . . 42, 77 Deschamps, A. . . . . . . . 52, 54, 71, 79 De Smet, P. . . . . . . . . . . . . . . . . . . . . 86 Desrayaud, C. . . . . . . . . . . . . . . . . . . 65 Dewhurst, C . . . . . . . . . . . . . . . . . . . 45 Diak, B. . . . . . . . . . . . . . . . . . . . . . . . 61 Diao, H. . . . . . . . . . . . . . . . . . . . . . . . 61 Ding, H . . . . . . . . . . . . . . . . . . . . . . . 49 Ding, K. . . . . . . . . . . . . . . . . . . . . . . . 54 Divandari, M. . . . . . . . . . . . . . . . . . . 84 Doherty, K. . . . . . . . . . . . . . . . . . . . . 59 Dohi, M. . . . . . . . . . . . . . . . . . . . . . . 65 Domack, M. . . . . . . . . . . . . . . . . . . . 40 Dorin, T. . . . . . . . . . . . . . . . . . . . . . . 72 Dou, Z . . . . . . . . . . . . . . . . . . . . . . . . 53 Drezet, J. . . . . . . . . . . . . . . . 56, 71, 91 Dubyna, A. . . . . . . . . . . . . . . . . . . . . 94 Dunand, D. . . . . . . . . . . . . . . . . 47, 56 Du, Y . . . . . . . . . . . . . . . . . . . . . . . . 79 Dzhurinskiy, D . . . . . . . . . . . . . . . . . 76

Index

E

106

Eason, P. . . . . . . . . . . . . . . . . . . . . . . 50 Easton, M. . . . . . . . . . . . . . . . . . 57, 63 Eberl, F. . . . . . . . . . . . . . . . . . . . . . . . 58 Eckert, J . . . . . . . . . . . . . . . . . . . . . . . 62 Edalati, K. . . . . . . . . . . . . . . . . . . . . . 43 Edo, M . . . . . . . . . . . . . . . . . . . . . . . . 60 Ehlers, F. . . . . . . . . . . . . . . . . . . . . . . 71 Ehrstrom, J . . . . . . . . . . . . . 58, 76, 77 Ehrström, J . . . . . . . . . . . . . . . . . . . . 58 Eifler, D . . . . . . . . . . . . . . . . . . . 50, 68 Ekström, H . . . . . . . . . . . . . . . . . . . . 50 Elgallad, E . . . . . . . . . . . . . . . . . . . . . 91 Emamy, M. . . . . . . . . . . . . . . . . 49, 84 Engelhardt, M. . . . . . . . . . . . . . 64, 82 Engler, O . . . . . . . . . . . . . . . . . . 70, 87 Engstrom, A . . . . . . . . . . . . . . . . . . . 79 Enomoto, M . . . . . . . . . . . . . . . . . . . 60 Enzinger, N . . . . . . . . . . . . . . . . . . . . 52

Eskin, D. . . . . . . . . . . . . . . . . . . . . . . 39 Estrin, Y. . . . . . . . . . . . . . . . . . . . . . . 43 Etheridge, J . . . . . . . . . . . . . . . . . . . . 47 Euh, K . . . . . . . . . . . . . . . . . . . . . . 103

F Falahati, A. . . . . . . . . . . . . . . . . . . . . 70 Faltus, J. . . . . . . . . . . . . . . . . . . 70, 103 Fan, R . . . . . . . . . . . . . . . . . . . . . . . . 74 Fan, Z . . . . . . . . . . . . . . . . . . . . . . . . 39 Felberbaum, M. . . . . . . . . . . . . . . . . 84 Felicelli, S. . . . . . . . . . . . . . . . . . . . . . 57 Feng, W . . . . . . . . . . . . . . . . . . . . . 101 Fernandes, R. . . . . . . . . . . . . . . . . . . 94 Feyen, G. . . . . . . . . . . . . . . . . . . 38, 77 Fife, J . . . . . . . . . . . . . . . . . . . . . . . . 57 Fischer, C. . . . . . . . . . . . . . . . . . . . . . 50 Flatøy, J. . . . . . . . . . . . . . . . . . . . . . . . 82 Flerus, B. . . . . . . . . . . . . . . . . . . . . . . 93 Flouriot, S . . . . . . . . . . . . . . . . . . . . . 52 Foecke, T. . . . . . . . . . . . . . . . . . . . . . 69 Fonseca, J. . . . . . . . . . . . . . . . . . . . . . 46 Foroozan, T. . . . . . . . . . . . . . . . . . . . 97 Fouvry, S . . . . . . . . . . . . . . . . . . . . . . 59 Fragner, W. . . . . . . . . . . . . . . . . . . . . 75 Frankel, G . . . . . . . . . . . . . . . . . 39, 92 Fridy, J . . . . . . . . . . . . . . . . . . . . . . . . 50 Friedrich, B. . . . . . . . . . . . . . . . . . . . 93 Friis, J . . . . . . . . . . . . . . . . . . . . . . . . 45 Fritsching, U. . . . . . . . . . . . . . . . . . . 74 Frohm, A. . . . . . . . . . . . . . . . . . . . . . 50 Frontczak, A . . . . . . . . . . . . . . . . . . . 98 Fujimoto, M. . . . . . . . . . . . . . . . . . . . 41 Furu, T. . . . . . . . . . . . . . . . . . . . . . . . 71

G Gada, N . . . . . . . . . . . . . . . . . . . . . . . 88 Gaies, J. . . . . . . . . . . . . . . . . . . . . . . . 79 Gallardy, D. . . . . . . . . . . . . . . . . . . . 59 Gallerneault, M. . . . . . . . . . 58, 64, 73, . . . . . . . . . . . . . . . . . 84, 87, 91 Gao, H . . . . . . . . . . . . . . . . . . . . . . . . 45 Gao, L . . . . . . . . . . . . . . . . . . . . . . . . 58 Gao, P . . . . . . . . . . . . . . . . . . . . . . 102 Gao, S . . . . . . . . . . . . . . . . . . . . . . . . 48 Gariepy, A . . . . . . . . . . . . . . . . . 40, 52 Gaustad, G. . . . . . . . . . . . . . . . . . . . . 88 Gauthier, P. . . . . . . . . . . . . . . . . . . . . 85 Gauvin, R. . . . . . . . . . . . . . . 42, 48, 91 Gawlik, M . . . . . . . . . . . . . . . . . . . 103 Gazizov, M. . . . . . . . . . . . . . . . 95, 103 Ghosh, K . . . . . . . . . . . . . . . . . . . . . . 85

Ghosh, M. . . . . . . . . . . . . . . . . . . . . . 85 Gibbs, J. . . . . . . . . . . . . . . . . . . . . . . . 57 Gildemeister, D. . . . . . . . . . . . . 57, 66 Giridharagopal, R. . . . . . . . . . . . . . . 86 Giron, A. . . . . . . . . . . . . . . . . . . . . . . 38 Glicksman, M . . . . . . . . . . . . . . . . . . 71 Godlewski, L. . . . . . . . . . . . . . . . . . . 70 Golumbfskie, W. . . . . . . . . . . . . . . . 79 Gottstein, G. . . . . . . . . . . . . . . . . . . . 46 Govindaraj, N. . . . . . . . . . . . . . . . . . 95 Grajales, L . . . . . . . . . . . . . . . . 93, 103 Grant, P . . . . . . . . . . . . . . . . . . . . . . . 49 Grittner, N. . . . . . . . . . . . . . 64, 65, 82 Grushko, O . . . . . . . . . . . . . . . . 78, 82 Guanxia, X. . . . . . . . . . . . . . . . . . . . . 49 Guiglionda, G. . . . . . . . . . . . . . . . . . 98 Guillot, M . . . . . . . . . . . . . . . . . . . . . 41 Güley, V. . . . . . . . . . . . . . . . . . . . . . . 45 Guo, F . . . . . . . . . . . . . . . . . . . . 45, 78 Guo, J . . . . . . . . . . . . . . . . . . . . . . . . 87

H Haase, M . . . . . . . . . . . . . . . . . . . . . . 45 Haga, T. . . . . . . . . . . . . . . . . . . . . . . . 83 Hajaghasi, A . . . . . . . . . . . . . . . 49, 84 Håkonsen, A. . . . . . . . . . . . . . . . . . . 71 Hales, S. . . . . . . . . . . . . . . . . . . . . . . . 40 Hall, J . . . . . . . . . . . . . . . . . . . . . . . . 78 Han, Y . . . . . . . . . . . . . . . . . . . . . . . . 74 Hao, X . . . . . . . . . . . . . . . . . . . . . . . . 43 Harada, Y. . . . . . . . . . . . . . . 58, 60, 83 Harrigan, W . . . . . . . . . . . . . . . . . . . 89 Harrison, N. . . . . . . . . . . . . . . . . . . . 78 Hartfield-Wunsch, S. . . . . . . . . . . . . 78 Harvey, D. . . . . . . . . . . . . . . . . . . . . . 76 Harvey, E. . . . . . . . . . . . . . . . . . . . . . 56 Hatalis, M . . . . . . . . . . . . . . . . . . . . . 39 Hata, S . . . . . . . . . . . . . . . . . . . . 80, 99 Hatkevich, S. . . . . . . . . . . . . . . . 40, 86 Hausild, P . . . . . . . . . . . . . . . . . . . . . 70 Haušild, P . . . . . . . . . . . . . . . . . . . 103 Hayashida, K. . . . . . . . . . . . . . . . . . . 60 Heard, D . . . . . . . . . . . . . . . . . . . . . . 91 Hegadekatte, V . . . . . . . . . . . . . . . . . 86 Hegde, R. . . . . . . . . . . . . . . . . . . . . . 44 Heinemann, A. . . . . . . . . . . . . . . . . . 45 Heinimann, M . . . . . . . . . . . . . . . . . 58 He, J . . . . . . . . . . . . . . . . . . . . . . . . 53 Hekmat-Ardakan, A. . . . . . . . . . . . 91 Henon, C. . . . . . . . . . . . . . . . . . . . . . 92 Hersent, E . . . . . . . . . . . . . . . . . . . . . 45 Hibino, A. . . . . . . . . . . . . . . . . . . . . . 52

Higashi, K . . . . . . . . . . . . . . . . . . . 102 Hino, M. . . . . . . . . . . . . . . . . . . . . 104 Hirano, S . . . . . . . . . . . . . . . . . . . . . . 46 Hiromi, N . . . . . . . . . . . . . . . . . . . . . 49 Hirosawa, S . . . . . . . . . . . . . . . 90, 100 Hirose, A . . . . . . . . . . . . . . . . . . . . . . 41 Hirsch, J. . . . . . . . . . . . . . . . 64, 69, 87 Hisayuki, K . . . . . . . . . . . . . . . . . . 102 Hishikawa, T. . . . . . . . . . . . . . . . . . . 46 Hofmeister, C . . . . . . . . . . . . . . . . . . 44 Holmedal, B. . . 45, 62, 81, 87, 88, 95 Holmestad, J . . . . . . . . . . . . . . . 40, 81 Holmestad, R. . . . . . . . . 40, 44, 47, 56, . . . . . . . . . . . . . . . . 71, 72, 103 Hong, S. . . . . . . . . . . . . . . . . . . . 62, 96 Hongwei, L . . . . . . . . . . . . . . . . . . 101 Hopperstad, O. . . . . . . . . . . . . . 62, 81 Hori, H. . . . . . . . . . . . . . . . . . . . . . . . 51 Horikawa, K . . . . . . . . . . . . . . . 51, 68 Horita, Z . . . . . . . . . 43, 55, 62, 65, 90 Hornig, N. . . . . . . . . . . . . . . . . . . . . 74 Horwatitsch, D. . . . . . . . . . . . . . . . . 42 Hosch, T. . . . . . . . . . . . . . . . 38, 48, 84 Hosseini, S. . . . . . . . . . . . . . . . . . . . . 41 Hsu, Y . . . . . . . . . . . . . . . . . . . . . . . . 44 Huang, G. . . . . . . . . . . . . . . . . . 46, 72 Huang, Y . . . . . . . . . . . . . . . . . . . . 102 Hugh, M. . . . . . . . . . . . . . . . . . . . . . . 89 Hu, L . . . . . . . . . . . . . . . . . . . . . . . . 69 Hunkel, M. . . . . . . . . . . . . . 52, 64, 65 Hunt, T. . . . . . . . . . . . . . . . . . . . . . . . 67 Hunt, W. . . . . . . . . . . . . . . . . . . 43, 62 Hu, P . . . . . . . . . . . . . . . . . . . . . . . . 45 Hutchinson, C. . . . . . . . . . . . . . . . . . 54 Hu, X . . . . . . . . . . . . . . . . . . . . . . . . 96 Huxhold, S. . . . . . . . . . . . . . . . . . . . . 50

I

J채ger, A. . . . . . . . . . . . . . . . . . . . . . . . 45 Jain, M. . . . . . . . . . . . . . . . . . . . . . . . 61 James, M . . . . . . . . . . . . . . . . . . . . . . 58 Jank, N. . . . . . . . . . . . . . . . . . . . . . . . 52 Jaroni, B. . . . . . . . . . . . . . . . . . . . . . . 93 Jarry, P. . . . . . . . . . . . . . . . . . . . . . . . 58 Jayaganthan, R . . . . . . . . . . . . . . . . . 55 Jeong, Y. . . . . . . . . . . . . . . . . . . . . . . 62 Jiang, H . . . . . . . . . . . . . . . . . . . . . . . 38 Jiang, J . . . . . . . . . . . . . . . . . . . . . . . . 61 Jia, Z . . . . . . . . . . . . . . . . . . . . . . . . 72 Jin, H . . . . . . . . . . . . . . . . . . . . . . . . 73 Ji, Y . . . . . . . . . . . . . . . . . . . . . . . . 45 Jodlowski, J. . . . . . . . . . . . . . . . . . . . 86 Johansson, S . . . . . . . . . . . . . . . . . . . 72 Johnson, A. . . . . . . . . . . . . . . . . . . . . 57 Jones, S. . . . . . . . . . . . . . . . . . . . . . . . 39

K Kahl, S . . . . . . . . . . . . . . . . . . . . . . . . 50 Kaibyshev, R . . . . . 77, 81, 94, 95, 103 Kakizaki, S. . . . . . . . . . . . . . . . . . . . . 52 Kalu, P. . . . . . . . . . . . . . . . . . . . . . 104 Kamiko, T. . . . . . . . . . . . . . . . . . . . . 47 Kanadani, T. . . . . . . . . . . . . . . . . . 104 Kanamori, K . . . . . . . . . . . . . . . . . . . 51 Kaneko, K . . . . . . . . . . . . . . . . . 80, 99 Kanesund, J. . . . . . . . . . . . . . . . . . . . 72 Kanetake, N. . . . . . . . . . 53, 61, 63, 99 Kang, C . . . . . . . . . . . . . . . . . . . 96, 97 Kang, D . . . . . . . . . . . . . . . . . . . . . . . 64 Kang, S. . . . . . . . . . . . . . . . . . . 66, 103 Kanno, Y . . . . . . . . . . . . . . . . . . . . . . 89 Karabin, L . . . . . . . . . . . . . . . . . . . . . 59 Karabin, M. . . . . . . . . . . . . . . . . . . . 38 Karlik, M. . . . . . . . . . . . . . . . . 70, 103 Karnesky, R. . . . . . . . . . . . . . . . . . . . 63 Kasprzak, W . . . . . . . . . . . . . . . 66, 74 Katgerman, L. . . . . . . . . . . . . . 39, 102 KATO, H. . . . . . . . . . . . . . . . . . . . 100 Katoh, Y. . . . . . . . . . . . . . . . . . . . . 102 Kaufmann, H . . . . . . . . . . . . . . 50, 75 Kawabata, T. . . . . . . . . . . 99, 100, 101 Kawakita, K. . . . . . . . . . . . . . . . . . 100 Kawamoto, C. . . . . . . . . . . . . . . . . . . 99 Kawecki, A. . . . . . . . . . . . . . . . . . . . . 81 Ke, M . . . . . . . . . . . . . . . . . . . . . . . . 49 Kessler, O. . . . . . . . . . . . . . . . . . 54, 56 Kestens, L. . . . . . . . . . . . . . . . . . 79, 86 K G, P . . . . . . . . . . . . . . . . . . . . . . . . 62

Khatir, M. . . . . . . . . . . . . . . . . . . . . . 98 Khokhlatova, L. . . . . . . . . . . . . . . . . 98 Khvan, A . . . . . . . . . . . . . . . . . . . . . . 64 Kiesiewicz, G. . . . . . . . . . . . . . . . . . . 81 Kikuchi, M. . . . . . . . . . . . . . . . . . . . . 99 Kim, C . . . . . . . . . . . . . . . . . . . . 96, 97 Kim, D. . . . . . . . . . . . . . . . . . . 66, 102 Kim, G . . . . . . . . . . . . . . . . . . . . . . . . 43 Kim, H. . . . . . . . . . . . 54, 92, 102, 103 Kim, J . . . . . . . . . . . 44, 89, 92, 96, 97 Kim, K . . . . . . . . . . . . . . . . . . . . . . 102 Kim, M. . . . . . . . . . . . . . . . . . . . . . . . 96 Kim, S . . . . . . . . . . . . . . . . . . . . 41, 92 Kimura, K . . . . . . . . . . . . . . . . . . . . . 85 Kim, Y . . . . . . . . . . . . . . . . . . . . 96, 97 Kinoshita, J . . . . . . . . . . . . . . . . . . . . 51 Kjellqvist, L . . . . . . . . . . . . . . . . . . . . 79 Klochkova, Y. . . . . . . . . . . . . . . . . . . 82 Klochkov, G. . . . . . . . . . . . . . . . 78, 82 Klocker, H. . . . . . . . . . . . . . . . . . . . . 98 Klose, C . . . . . . . . . . . . . . . . . . . 64, 82 Klyszewski, A . . . . . . . . . . . . . . 76, 98 Knight, B . . . . . . . . . . . . . . . . . . . . . . 75 Knipling, K . . . . . . . . . . . . . . . . 48, 67 Knych, T . . . . . . . . . 55, 68, 73, 74, 81, . . . . . . . . . . . . . . . . . 82, 83, 89 Kobashi, M . . . . . . . . . . 53, 61, 63, 99 Kobayashi, E . . . . . . . . . 44, 54, 66, 90 Kobayashi, H. . . . . . . . . . . . . . . . . . . 51 Kobayashi, M . . . . . . . . . . . . . . 47, 68 Kohida, T. . . . . . . . . . . . . . . . . . . . . . 85 Ko, L . . . . . . . . . . . . . . . . . . . . . . . . 46 Kolobnev, N. . . . . . . . . . . . . . . . . . . . 98 Komarov, S . . . . . . . . . . . . . 38, 40, 91 Kori, S . . . . . . . . . . . . . . . . . . . . . . 102 Korzen, K. . . . . . . . . . . . . . . . . . 68, 73 Ko, S . . . . . . . . . . . . . . . . . . . . . . 102 Kostazos, P . . . . . . . . . . . . . . . . . . . . 86 Koumarioti, I. . . . . . . . . . . . . . . . . . . 86 Kovarik, L . . . . . . . . . . . . . . . . . . . . . 44 Kozeschnik, E. . . . . . . . . . . . . . . . . . 70 Kraus, L . . . . . . . . . . . . . . . . . . . . . . . 47 Kulak, M . . . . . . . . . . . . . . . . . . . . . . 58 Kumai, S. . . . . . . . . . . . . 52, 58, 60, 83 Kumai, S. . . . . . . . . . . . . . . . . . . . . . . 83 Kumar, A. . . . . . . . . . . . . . . . . . . . . . 61 Kumar, S. . . . . . . . . . . . . . . . . . . 49, 66 Kume, Y. . . . . . . . . . . . . . . . . . . 61, 63 Kunimine, T . . . . . . . . . . . . . . . 46, 91 Kurahatti, R. . . . . . . . . . . . . . . . . . 102 Kurita, H . . . . . . . . . . . . . . . . . . . . . . 66 Kuroda, S. . . . . . . . . . . . . . . . . . . . . . 60

13th International Conference on Aluminum Alloys

Index

Iadicola, M. . . . . . . . . . . . . . . . . . . . . 69 Ichitani, K . . . . . . . . . . . . . . . . . . . . . 52 Ikeda, K . . . . . . . . . . . . . . . . . . . 80, 99 Ikeno, S . . . . . . . . . . . 65, 99, 100, 101 Imani, Y. . . . . . . . . . . . . . . . . . . . . . . 41 Inaba, T . . . . . . . . . . . . . . . . . . . . . . . 78 Inal, K . . . . . . . . . . . . . . 42, 51, 61, 69 Ishiwata, Y. . . . . . . . . . . . . . . . . 38, 91 Ishizima, Y. . . . . . . . . . . . . . . . . . . . . 85 Itoh, G . . . . . . . . . . . . . . . . . . . . 56, 68 Ivanov, R . . . . . . . . . . . . . . . . . . . . . . 42 Iwamura, S. . . . . . . . . . . . . . . . . . . . . 74 Izumi, T. . . . . . . . . . . . . . . . . . . . . . . 60

J

107

Kurtuldu, G. . . . . . . . . . . . . . . . . . . . 58 Kuwabara, T . . . . . . . . . . . . . . . . . . . 42 Kwasniewski, P. . . . . . . . . . . . . . . . . 81

Index

L

108

Ladani, L . . . . . . . . . . . . . . . . . . 56, 80 Lang, P. . . . . . . . . . . . . . . . . . . . . . . . 70 Lang, Y. . . . . . . . . . . . . . . . . . . . . . . . 99 Larose, S. . . . . . . . . . . . . . . . . . . . . . . 52 Larouche, D. . . . . . . . . . . . . . . . 59, 82 Laspe, A. . . . . . . . . . . . . . . . . . . . . . . 67 Lauridsen, E . . . . . . . . . . . . . . . . . . . 57 Lavernia, E. . . . . . . . . . . . . . . . . 43, 63 Lech-Grega, M . . . . . . . . . 80, 98, 103 LeClere, D . . . . . . . . . . . . . . . . . . . . . 47 Lee, C . . . . . . . . . . . . . . . . . . . . . . . . 41 Lee, G . . . . . . . . . . . . . . . . . . . . . . . . 96 Lee, J . . . . . . . . . . . . . . . . . . . . 86, 92 Lee, K . . . . . . . . . . . . . . . . . . . . . . . . 41 Lee, S . . . . . . . . . . . . . 65, 90, 96, 102 Lee, Y . . . . . . . . . . . . . . . . . . . . . . . . 97 Leo, P . . . . . . . . . . . . . . . . . . . . 40, 89 Lépinoux, J . . . . . . . . . . . . . . . . . . . . 63 Leshchynsky, V. . . . . . . . . . . . . . . . . 76 Levendusky, T. . . . . . . . . . . . . . . . . . 39 Lévesque, M . . . . . . . . . . . . . . . 40, 52 Lewandowski, J. . . . . . . . . . . . . 62, 98 Lewis, A. . . . . . . . . . . . . . . . . . . . . . . 67 Liang, Z . . . . . . . . . . . . . . . . 45, 64, 87 Liao, H. . . . . . . . . . . . . . . . . 46, 54, 74 Liao, X . . . . . . . . . . . . . . . . . . . . . . . . 90 Liddicoat, P. . . . . . . . . . . . . . . . . . . . 90 Li, G . . . . . . . . . . . . . . . . . . . . 90, 92 Li, H . . . . . . . . . . . . . . . . . . . . . . . . 39 Li, J . . . . . . . . . . . . . . . . . 63, 93, 98 Li, M . . . . . . . . . . . . . . . . . . . . 70, 78 Lima, N . . . . . . . . . . . . . . . . . . . . . . . 94 Lim, S . . . . . . . . . . . . . . . . . . . 54, 102 Li, P . . . . . . . . . . . . . . . . . . . . 49, 76 Li, S . . . . . . . . . . . . . . . . . . . . . . . . 98 LI, T . . . . . . . . . . . . . . . . . . . . . . . . 94 Liu, H . . . . . . . . . . . . . . . . . . . 98, 101 Liu, M . . . . . . . . . . . . . . . . . . . . 56, 64 Liu, Q . . . . . . . . 41, 46, 65, 72, 73, 94 Liu, S . . . . . . . . . . . . . . . . . . . . . . . . 79 Liu, T . . . . . . . . . . . . . . . . . . . . . . . . 90 Liu, X . . . . . . . . . . . . . . . . . . . . 49, 92 Liu, Y . . . . . . . . . . . . . . . . . 51, 63, 95 Li, X . . . . . . . . . . . . . . . . 55, 98, 101 Li, Y . . . . 44, 45, 63, 71, 72, 82, 103 Li, Z . . . . . . . . . . . . . . . . . . . 98, 101 Lloyd, D. . . . . . . . . . . . . . . . . . . 69, 73

Lowery, A. . . . . . . . . . . . . . . . . . . . . . 97 Luckey, G. . . . . . . . . . . . . . . . . . . . . . 78 Lukina, N. . . . . . . . . . . . . . . . . . . . . . 62 Lu, Z . . . . . . . . . . . . . . . . . . . . . . . . 92 Lv, L . . . . . . . . . . . . . . . . . . . . . . . . 69

M Ma, C . . . . . . . . . . . . . . 43, 61, 90, 92 Maev, R . . . . . . . . . . . . . . . . . . . . . . . 76 Ma, F . . . . . . . . . . . . . . . . . . . . . . . . 92 Magee, A . . . . . . . . . . . . . . . . . . . . . . 80 Magnusen, P . . . . . . . . . . . . . . . . . . . 59 Mahato, A . . . . . . . . . . . . . . . . . . . . . 69 Mahmoodkhani, Y. . . . . . . . . 93, 103 Majima, K . . . . . . . . . . . . . . . . . . . . . 85 Ma, K . . . . . . . . . . . . . . . . . . . . . . . . 74 Makino, Y . . . . . . . . . . . . . . . . . . . . . 46 Makk, P. . . . . . . . . . . . . . . . . . . . . . . 53 Malard, B. . . . . . . . . . . . . . . . . . . . . . 71 Mallapur, D. . . . . . . . . . . . . . . . . . 102 Mamala, A. . . . . . . . . . . . . . 73, 81, 89 Maniee, A . . . . . . . . . . . . . . . . . . . . . 97 Manik, T . . . . . . . . . . . . . . . . . . 62, 87 Manolakos, D . . . . . . . . . . . . . . . . . . 86 Marioara, C. . . . . . . 44, 47, 56, 71, 81 Markstrom, A. . . . . . . . . . . . . . . . . . 79 Marrocco, T. . . . . . . . . . . . . . . . . . . . 76 Marthinsen, K. . . . . . . . 45, 65, 81, 82 Marzouk, M. . . . . . . . . . . . . . . . . . . . 61 Mason, P . . . . . . . . . . . . . . . . . . . . . . 79 Masuda, T . . . . . . . . . . . . . . . . . . . . . 54 Matekovits, L. . . . . . . . . . . . . . . . . . . 97 Matsuda, K . . . . . . . 44, 56, 63, 65, 90, . . . . . . . . . . . . . . . 99, 100, 101 Matsuura, K. . . . . . . . . . . . . . . . . . 101 Matsuzaki, T . . . . . . . . . . . . . . . . . . . 56 Mattei, L. . . . . . . . . . . . . . . . . . . . . . . 98 Ma, X . . . . . . . . . . . . . . . . . 39, 49, 89 Mbuya, T. . . . . . . . . . . . . . . . . . 50, 57 McQueen, H . . . . . . . . . . . . . . . . . . . 80 Melzer, C . . . . . . . . . . . . . . . . . . 72, 74 Merstallinger, A . . . . . . . . . . . . . . . . 42 Miksis, M. . . . . . . . . . . . . . . . . . . . . . 57 Milkereit, B . . . . . . . . . . . . . . . . 54, 56 Mills, M. . . . . . . . . . . . . . . . . . . . . . . 44 Minoda, T . . . . . . . . . . . . . . . . . . . . . 64 Miroux, A . . . . . . . . . . . . . . . . . . . . . 39 Mishra, R. . . . . . . . . . . . . . . 42, 51, 69 Misiolek, W. . . . . . . . . . . . . 39, 45, 80 Mitsuhara, M. . . . . . . . . . . . . . . 80, 99 Miura, N . . . . . . . . . . . . . . . . . . . . 100 Miyajima, Y. . . . . . . . . . . . . . . . . . . . 96

Miyata, Y. . . . . . . . . . . . . . . . . . . . . . 72 Mizushima, K . . . . . . . . . . . . . . . . . . 51 Mogucheva, A. . . . . . . . 77, 81, 94, 95 Mohamed, A. . . . . . . . . . . . . . . . . . . 39 Mohammadi, M . . . . . . . . . . . . . . . . 42 Mohn, P. . . . . . . . . . . . . . . . . . . . . . . 70 Mokso, R . . . . . . . . . . . . . . . . . . . . . . 53 Moldovan, P . . . . . . . . . . . . . . . . . . . 67 Mooy, D. . . . . . . . . . . . . . . . . . . 59, 77 Morales, R. . . . . . . . . . . . . . . . . . . . . 92 Moran, J. . . . . . . . . . . . . . . . . . . 66, 92 Mori, N . . . . . . . . . . . . . . . . . . . . . . . 65 Mortensen, A . . . . . . . . . . . . . . . . . . 53 Mortensen, D . . . . . . . . . . . . . . . . . . 71 Mørtsell, E. . . . . . . . . . . . . . . . . . . 103 Motoshima, H. . . . . . . . . . . . . . . . . . 90 Mouhyddine, K. . . . . . . . . . . . . . . 101 Mousavi Anijdan, H. . . . . . . . . . . . . 64 Muggerud, A. . . . . . . . . . . . . . 72, 103 Mukhopadhyay, A . . . . . . . . . . 54, 61 Muraishi, S. . . . . . . . . . . . . . . . . . . . . 44 Murakami, K. . . . . . . . . . . . . . . . . 104 Murakami, S . . . . . . . . . . . . . . 99, 100 Murakami, T. . . . . . . . . . . . . . . . . 101 Murashkin, M. . . . . . . . . . . . . . . . . . 90 Murata, T. . . . . . . . . . . . . . . . . . . . . . 51 Myhr, O . . . . . . . . . . . . . . . . . . . 81, 87

N Nagai, T . . . . . . . . . . . . . . . . . . . . . 100 Nagaumi, H. . . . . . . . . . . . . 38, 45, 74 Nakagawa, K. . . . . . . . . . . . . . . . . 104 Nakamura, J. . . . . . . . . . . . . . . . . . 100 Nakamura, R. . . . . . . . . . . . . . . . . . . 83 Nakashima, H. . . . . . . . . . . . . . 80, 99 Napolitano, R . . . . . . . . . . . . . . 38, 48 Nardini, D. . . . . . . . . . . . . . . . . . . . . 86 Nayebi, B . . . . . . . . . . . . . . . . . . . . . . 84 Nes, E . . . . . . . . . . . . . . . . . . . . . . . . 65 Ngan, A . . . . . . . . . . . . . . . . . . . . . . . 68 Nie, J . . . . . . . . . . . . . . . . . . . . . . . . 49 Nikfarazari, M. . . . . . . . . . . . . . . . . . 41 Ningileri, S. . . . . . . . . . . . . . . . . 51, 95 Nishida, H. . . . . . . . . . . . . . . . . . . . . 41 Nishida, T . . . . . . . . . . . . . . . . . . . . . 41 Nishimura, K. . . . . . . . . . . . . . . . . . . 56 Nowak, A. . . . . . . . . . . . . . . . . . . . . . 89 Nowak, M . . . . . . . . . . . . . . . . . 76, 98 Nunomura, N . . . . . . . . . . . . . . . . . . 85 Nwajagu, C . . . . . . . . . . . . . . . . . . . . 75 Nwonye, E. . . . . . . . . . . . . . . . 75, 104 Nyirenda, K. . . . . . . . . . . . . . . . . . . . 73

O Odo, J . . . . . . . . . . . . . . . . . . . . . . 104 Oe, Y . . . . . . . . . . . . . . . . . . . . . . 100 Ogawa, K. . . . . . . . . . . . . . . . . . . . . . 74 Ogawa, Y. . . . . . . . . . . . . . . . . . . . 101 Ogle, K. . . . . . . . . . . . . . . . . . . . . . . . 86 Oglodkov, M. . . . . . . . . . . . . . . . . 104 Ogura, T. . . . . . . . . . . . . . . . . . . 41, 63 Okada, M. . . . . . . . . . . . . . . . . . . . . . 46 Okano, Y . . . . . . . . . . . . . . . . . . . . . . 61 Okorie, B . . . . . . . . . . . . . . . . . . . . 104 Omichi, N . . . . . . . . . . . . . . . . . . . . . 41 Oogo, H. . . . . . . . . . . . . . . . . . . . . . . 68 Opyrchal, M . . . . . . . . . . . . . . . 76, 98 O’Reilly, K . . . . . . . . . . . . . . . . . . . . . 49 Orongil, S. . . . . . . . . . . . . . . . . . . . . . 44 Osten, J. . . . . . . . . . . . . . . . . . . . . . . . 54 Osuch, P. . . . . . . . . . . . . . . . . . . . . . . 73 Ouarda, O . . . . . . . . . . . . . . . . . . . 101 Ovchinnikov, V. . . . . . . . . . . . . . . . . 78

P

Q Qayyume, R. . . . . . . . . . . . . . . . . . . . 61 Qian, M. . . . . . . . . . . . . . . . . . . . . . . 57

R Rabeeh, B. . . . . . . . . . . . . . . . . . 88, 94 Raddad, B . . . . . . . . . . . . . . . . . . . . . 42 Radetic, T. . . . . . . . . . . . . . . . . . . . . 67 Raman, R. . . . . . . . . . . . . . . . . . . . . . 90 Ranjbar Bahadori, S. . . . . . . . . . . 104 Rappaz, M. . . . . . . . . . . . . . . . . . . . . 58 Raveendra, S . . . . . . . . . . . . . . . . . . . 61 Reed, P. . . . . . . . . . . . . . . . . . . . 50, 57 Reiner, L. . . . . . . . . . . . . . . . . . . . . . . 85 Reiso, O. . . . . . . . . . . . . . . . . . . . . . . 40 Ren, J . . . . . . . . . . . . . . . . . . . . . . 102 Repper, J. . . . . . . . . . . . . . . . 56, 71, 91 Requena, G . . . . . . . . . . . . . . . . . . . . 82 Reynolds, T. . . . . . . . . . . . . . . . . . . . 55 R.H, M. . . . . . . . . . . . . . . . . . . . . . . . 84 Rikos, A. . . . . . . . . . . . . . . . . . . . . . . 86 Ringer, S. . . . . . . . . . 45, 47, 48, 90, 99 Ringeval, S. . . . . . . . . . . . . . . . . . . . . 52 Rioja, R. . . . . . . . . . . . . . . . . 38, 59, 77 Robosky, D . . . . . . . . . . . . . . . . . . . . 55 Robson, J. . . . . . . . . . . . . . . . . . 51, 60 Roh, J 62 Rollett, A. . . . . 38, 39, 40, 42, 43, 44, . . . . . . . 45, 47, 48, 50, 51, 53, . . . . . . . 54, 56, 57, 58, 60, 61, . . . . . . . 62, 63, 64, 66, 68, 69, . . . . . . . 70, 71, 72, 73, 74, 75, . . . . . . . 76, 77, 78, 79, 80, 81, . . . . . . . 83, 84, 85, 86, 87, 88, . . . . . . . 89, 90, 91, 92, 93, 94, . . . . . . . . . . . . . . . . . . . . . . . . 96 Romankov, S. . . . . . . . . . . . . . . . . . . 40 Rombach, G. . . . . . . . . . . . . . . . . . . . 93 Rometsch, P. . . . . . . . . . . . . 43, 48, 70 Romhanji, E. . . . . . . . . . . . . . . . . . . . 67 Ronxin, J . . . . . . . . . . . . . . . . . . . . . . 58 Rose, A. . . . . . . . . . . . . . . . . . . . . . . . 74

Rossiter, J. . . . . . . . . . . . . . . . . . . . . . 51 Rosso, M . . . . . . . . . . . . . . . . . . . . . . 83 Roth, J . . . . . . . . . . . . . . . . . . . . . . . . 62 Rouault, S. . . . . . . . . . . . . . . . . . . . . . 92 Rout, P. . . . . . . . . . . . . . . . . . . . . . . . 85 Røyset, J. . . . . . . . . . . . . . . . . . . . . . . 81 Rutecki, P. . . . . . . . . . . . . . . . . . . . . . 98 Ryabov, D. . . . . . . . . . . . . . . . . . . . . . 98

S Sachdev, A. . . . . . . . . . . . . . . . . . . . . 69 Sada, Y. . . . . . . . . . . . . . . . . . . . . . . . 60 Saga, M. . . . . . . . . . . . . . . . . . . . . . . . 99 Saghafian, H . . . . . . . . . . . . . . . . . . . 74 Sahihi, F. . . . . . . . . . . . . . . . . . . . . . . 74 Saimoto, S . . . . . . . . . . . . . . . . . . . . . 61 Saito, T. . . . . . . . . . . . . . . . . . . . . . . . 44 Sakaguchi, M. . . . . . . . . . . . . . . . . 102 Sakakibara, A . . . . . . . . . . . . . . . . 104 Saleema, N. . . . . . . . . . . . . . . . . . . . . 85 Sälzle, P . . . . . . . . . . . . . . . . . . . . . . . 91 Samajdar, I. . . . . . . . . . . . . . . . . . . . . 61 Samoshina, M. . . . . . . . . . . . . 99, 100 Sample, V. . . . . . . . . . . . . . . 55, 64, 94 Samuel, A. . . . . . . . . . . . . . . . . . . . . . 62 Samuel, E. . . . . . . . . . . . . . . . . . . . . . 75 Samuel, F. . . . . . . . . . . . . . . . . . 39, 62 Sanders, R . . . . . . . . . . . . . . . . . 78, 86 Sankaran, K. . . . . . . . . . . . . . . . 50, 58 San Marchi, C. . . . . . . . . . . . . . . . . . 63 Sano, T. . . . . . . . . . . . . . . . . . . . . . . . 41 Sato, H . . . . . . . . . . . . . . . . . . . . 46, 91 Sato, M. . . . . . . . . . . . . . . . . . . . . . . . 76 Sato, T . . . . . . . . . . . 44, 54, 63, 66, 90 Sawa, Y. . . . . . . . . . . . . . . . . . . . . . . . 52 Sawtell, R. . . . . . . . . . . . . . . . . . . . . . 38 Scamans, G . . . . . . . . . . . . . . . . . . . . 39 Schäfer, C. . . . . . . . . . . . . . . . . . 70, 87 Schaper, M. . . . . . . . . . . . . . . . . . . . . 64 Scheriau, S. . . . . . . . . . . . . . . . . . . . . 47 Schick, C . . . . . . . . . . . . . . . . . . 54, 56 Schloth, P. . . . . . . . . . . . . . . . . . 56, 91 Schmidt-Brandecker, B . . . . . . . . . . 76 Schmidt, H . . . . . . . . . . . . . . . . 58, 76 Schuettenberg, S. . . . . . . . . . . . . . . . 74 Schuler, D . . . . . . . . . . . . . . . . . . . . . 48 Schulz, P. . . . . . . . . . . . . . . . . . . 72, 74 Sciezor, W . . . . . . . . . . . . . . . . . . . . . 81 Scotto D’Antuono, D . . . . . . . . . . . . 79 Scott, S. . . . . . . . . . . . . . . . . . . . . . . . 87 Scudino, S . . . . . . . . . . . . . . . . . . . . . 62 Sediako, D. . . . . . . . . . . . . . . . . . . . . 66

13th International Conference on Aluminum Alloys

Index

Padilha, A . . . . . . . . . . . . . . . . . . . . . 94 Palukuri, N . . . . . . . . . . . . . . . . . . . . 55 Pana, M . . . . . . . . . . . . . . . . . . . . . . . 67 Pantazopoulos, G. . . . . . . . . . . . . . . 86 Panteli, A. . . . . . . . . . . . . . . . . . . . . . 60 Paola, V . . . . . . . . . . . . . . . . . . . . . . . 55 Pardeshi, R. . . . . . . . . . . . . . . . . . . . . 58 Park, J . . . . . . . . . . . . . . . . . . . . 96, 97 Park, S . . . . . . . . . . . . . . . . . . . . . . . . 96 Parry, G . . . . . . . . . . . . . . . . . . . . . . . 52 Parshizfard, E . . . . . . . . . . . . . . . . . . 74 Parson, N. . . . . 63, 73, 78, 81, 93, 103 Pech-Canul, M . . . . . . . . . . . . . . . . . 86 Peiying, L. . . . . . . . . . . . . . . . . . 73, 93 Peiyue, L. . . . . . . . . . . . . . . . . . . . . 101 Pelayo, R. . . . . . . . . . . . . . . . . . . . . . . 84 Penlington, A . . . . . . . . . . . . . . . . . . 61 Perrier, F . . . . . . . . . . . . . . . . . . . . . . 65 Perron, C. . . . . . . . . . . . . . . . . . 40, 52 Peter, I . . . . . . . . . . . . . . . . . . . . 83, 97 Petrov, R. . . . . . . . . . . . . . . . . . . 79, 86 Phillips, P. . . . . . . . . . . . . . . . . . . . . . 44 Phongphisutthinan, C . . . . . . . . . . . 90 Pippan, R. . . . . . . . . . . . . . . . . . . . . . 47 Pirling, T . . . . . . . . . . . . . . . . . . . . . . 71 Piwowarska, M . . . . . . . 55, 74, 82, 83 Placzankis, B. . . . . . . . . . . . . . . . . . . 59 Plaut, R. . . . . . . . . . . . . . . . . . . . . . . . 94 Pletcher, B . . . . . . . . . . . . . . . . . . . . . 71

Poole, W . . . . . . . . 73, 78, 84, 93, 103 Popovic, M . . . . . . . . . . . . . . . . . . . . 67 Popov, V. . . . . . . . . . . . . . . . . . . . . . . 78 Prangnell, P. . . . . . . . . . . . . . . . 42, 60 Prasada Rao, A . . . . . . . . . . . . . . . . . 39 Prasad, K. . . . . . . . . . . . . . . . . . 54, 61 Pratt, F. . . . . . . . . . . . . . . . . . . . . . . . 56 Prillhofer, R. . . . . . . . . . . . . . . . 72, 74 Puydt, Q. . . . . . . . . . . . . . . . . . . . . . . 52

109

Index 110

Seidman, D . . . . . . . . . . . . . . . . 47, 56 Seifi, M. . . . . . . . . . . . . . . . . . . . . . . . 98 Senatorova, O . . . . . . . . . . . . . . . . . . 62 Seo, J . . . . . . . . . . . . . . . . . . . . . . . . 62 Seok, S . . . . . . . . . . . . . . . . . . . . . . . . 97 Seong, B. . . . . . . . . . . . . . . . . . . . . . . 54 Seong, J . . . . . . . . . . . . . . . . . . . . . . . 39 Serdechnova, M . . . . . . . . . . . . . . . . 86 Shabestari, S . . . . . . . . . . . . . . . . . . . 74 Sha, G . . . . . . . . . . . . . . 45, 47, 48, 99 Shah, K. . . . . . . . . . . . . . . . . . . . . . . . 39 Shamray, V . . . . . . . . . . . . . . . . . . . . 82 Shang, J . . . . . . . . . . . . . . . . . . . 40, 86 Shankar, S . . . . . . . . . . . . . . . . . . . . . 61 Shao, W . . . . . . . . . . . . . . . . . . . . . . . 69 Sharma, A . . . . . . . . . . . . . . . . . . . . . 66 Sharma, S. . . . . . . . . . . . . . . . . . . . . . 66 Shi, C . . . . . . . . . . . . . . . . . . . . . . . . 46 Shiflet, G . . . . . . . . . . . . . . 44, 63, 100 Shijie, G . . . . . . . . . . . . . . . . . . . . . . . 49 Shimasaki, S . . . . . . . . . . . . . . . 89, 94 Shin, J . . . . . . . . . . . . . . . . . . . . . . 102 Shin, Y . . . . . . . . . . . . . . . . . . . . . . . . 89 Shi, Y . . . . . . . . . . . . . . . . . 69, 86, 87 Shu, J . . . . . . . . . . . . . . . . . . . . . . . . 99 Sidor, J . . . . . . . . . . . . . . . . . . . . . . . . 79 Sigli, C . . . . . . . . . . . . . . . . . . . . 54, 63 Sinclair, C. . . . . . . . . . . . . . . . . . . . . . 84 Sinclair, I . . . . . . . . . . . . . . . . . . 50, 57 Singh, D. . . . . . . . . . . . . . . . . . . . . . . 55 Singh, N. . . . . . . . . . . . . . . . 64, 84, 93 Sisson, R. . . . . . . . . . . . . . . . . . . . . . . 87 Slagsvold, M . . . . . . . . . . . . . . . . . . . 88 Smierciak, R . . . . . . . . . . . . . . . . . . . 89 Smyrak, B. . . . . . . . . . . . 55, 68, 73, 81 Soady, K. . . . . . . . . . . . . . . . . . . 50, 57 Sogabe, G. . . . . . . . . . . . . . . . . . . . . . 63 Sohi, M. . . . . . . . . . . . . . . . . . . . 64, 84 Sohn, Y. . . . . . . . . . . . . . . . . . . . 43, 44 Soki, P . . . . . . . . . . . . . . . . . . . . . . . . 53 Song, W. . . . . . . . . . . . . . . . . . . . . . . 74 Son, H . . . . . . . . . . . . . . . . . . . . . . . . 41 Sordelet, D. . . . . . . . . . . . . . . . . . . . . 62 Souissi, S . . . . . . . . . . . . . . . . . . . . . . 97 Souza, F . . . . . . . . . . . . . . . . . . . . . . . 94 Spanos, G. . . . . . . . . . . . . . . . . . 70, 78 Spigarelli, S . . . . . . . . . . . . . . . . . . . . 89 Squillacioti, R . . . . . . . . . . . . . . . . . . 59 Stadler, F . . . . . . . . . . . . . . . . . . . . . . 75 Stanica, C. . . . . . . . . . . . . . . . . . . . . . 67 Steinhoff, K . . . . . . . . . . . . . . . . . . . . 42 StJohn, D. . . . . . . . . . . . . . . . . . . . . . 57

Stoughton, T . . . . . . . . . . . . . . . . . . . 51 Striewe, B. . . . . . . . . . . . . . . . . . 64, 65 Strobel, K. . . . . . . . . . . . . . . . . . . . . . 63 Strumban, E. . . . . . . . . . . . . . . . . . . . 76 Stuczynski, T. . . . . . . . . . . . . . . . . . . 83 Sugita, Y. . . . . . . . . . . . . . . . . . . . . . . 40 Su, H . . . . . . . . . . . . . . . . . . . . . . . . 53 Sukiman, N. . . . . . . . . . . . . . . . 66, 75 Sunada, S. . . . . . . . . . . . . . . . . . . . . . 85 sun, b . . . . . . . . . . . . . . . . . . . . . . . . 84 Sun, B . . . . . . . . . . . . . . . . . . . . . . . . 45 Surreddi, K . . . . . . . . . . . . . . . . . . . . 62 Su, X . . . . . . . . . . . . . . . . . . . . . . . . 70 Suzuki, K . . . . . . . . . . . . . . . . . . . . . . 51 Suzuki, Y . . . . . . . . . . . . . . . . . . 47, 68 Sweet, L . . . . . . . . . . . . . . . . . . . . . . . 63 Szรกmel, G. . . . . . . . . . . . . . . . . . . . . . 53 Szymanski, W. . . . . . . . . . . . . 98, 103

T Tadmor, E . . . . . . . . . . . . . . . . . . . . . 79 Taghiabadi, R . . . . . . . . . . . . . . . . . . 97 Taheri, M. . . . . . . . . . . . . . . . . . . . . . 79 Tajouri, A. . . . . . . . . . . . . . . . . . . . . . 42 Takagi, H. . . . . . . . . . . . . . . . . . . . 100 Takahashi, K . . . . . . . . . . . . . . . . . . . 89 Takahashi, S. . . . . . . . . . . . . . . . . . . . 42 Takaki, Y . . . . . . . . . . . . . . . . . . . . . . 54 Takashita, T. . . . . . . . . . . . . . . . . . . . 80 Takata, K . . . . . . . . . . . . . . . . . . . . . . 99 Takaya, K. . . . . . . . . . . . . . . . . . . . . . 60 Takayama, Y . . . . . . . . . . . . . . . 60, 76 Takeda, Y. . . . . . . . . . . . . . . . . . . . . . 91 Takeuchi, A. . . . . . . . . . . . . . . . 47, 68 Taleff, E . . . . . . . . . . . . . . . . . . . . . . . 86 Taniguchi, S. . . . . . . . . . . . . . . . 89, 94 Tashlykova-Bushkevich, I. . . . . . . . 56 Tayon, W. . . . . . . . . . . . . . . . . . . . . . 40 Tchitembo Goma, F. . . . . . . . . 59, 82 Tekkaya, A. . . . . . . . . . . . . . . . . 45, 94 Temmar, M . . . . . . . . . . . . . . . . . . . . 98 Terada, D. . . . . . . . . . . . . . . . . . . . . . 90 Tezuka, H. . . . . . . . . . . . . . . . . . 66, 90 Thomson, R. . . . . . . . . . . . . . . . . . . . 50 Tian, W . . . . . . . . . . . . . . . . . . . . . . . 49 Tietao, Z. . . . . . . . . . . . . . . . . . . 73, 93 Tiryakioglu, M . . . . . . . . . . . . . . . . . 50 Tkachenko, E. . . . . . . . . . . . . . . . . . 57 Toda, H . . . . . . . . . . . . . . . . . . . 47, 68 Tokai, D. . . . . . . . . . . . . . . . . . . . . . . 99 Tokuda, M. . . . . . . . . . . . . . . . . . . 100 Tomono, D. . . . . . . . . . . . . . . . . . . . . 56

Tomus, D. . . . . . . . . . . . . . . . . . . . . . 70 Topping, T. . . . . . . . . . . . . . . . . 44, 63 Toulfatzis, A . . . . . . . . . . . . . . . . . . . 86 Trexler, M . . . . . . . . . . . . . . . . . . . . . 43 Troconis, B. . . . . . . . . . . . . . . . . . . . 39 Trudeau, M . . . . . . . . . . . . . . . . . . . . 48 Tsuji, N. . . . . . . . . . . . . . . . . . . . . . . . 96 Tsuruta, H . . . . . . . . . . . . . . . . . . . . . 68

U Udupa, K . . . . . . . . . . . . . . . . . . . . 102 Ueda, T. . . . . . . . . . . . . . . . . . . . . . . . 60 Uesugi, K. . . . . . . . . . . . . . . 47, 68, 94 Uetani, Y . . . . . . . . . . 65, 99, 100, 101 Uffelmann, D. . . . . . . . . . . . . . . . . . . 72 Uggowitzer, P . . . . . . . . . . . . . . . . . . 75 Uliasz, P. . . . . . . . . . 55, 74, 82, 83, 89 Unal, A. . . . . . . . . . . . . . . . . . . . . . . . 83 Ushioda, K. . . . . . . . . . . . . . . . . . . . . 99 Usui, E . . . . . . . . . . . . . . . . . . . . . . . . 78

V Vakhromov, R. . . . . . . . . . . . . . . . . . 57 Valberg, H. . . . . . . . . . . . . . . . . 80, 89 Valiev, R. . . . . . . . . . . . . . . . . . . . . . . 90 van den Bergh, M. . . . . . . . . . . . . . . 44 Vandenburgh, P . . . . . . . . . . . . . . . . 92 Van, G . . . . . . . . . . . . . . . . . . . 54, 102 Van Swygenhoven, H. . . . . . . . 56, 91 Vazdirvanidis, A. . . . . . . . . . . . . . . . 86 Vega, L. . . . . . . . . . . . . . . . . . . . . . . . 39 Venema, G. . . . . . . . . . . . . . . . . 59, 77 Verma, A . . . . . . . . . . . . . . . . . . . . . . 49 Viskari, L. . . . . . . . . . . . . . . . . . . . . . 48 Volovitch, P. . . . . . . . . . . . . . . . . . . . 86 von Hehl, A. . . . . . . . . . 52, 64, 65, 74 Voorhees, P. . . . . . . . . . . . . . . . . . . . 57

W Wagener, R. . . . . . . . . . . . . . . . . . . . . 50 Wagner, G . . . . . . . . . . . . . . . . . 50, 68 Wagstaff, R. . . . . . . . . . . . . . . . . . . . . 48 Wakaguri, S. . . . . . . . . . . . . . . . . . . . 52 Waldhรถr, A . . . . . . . . . . . . . . . . . . . . 52 Walmsley, J . . . . . . . . . . . . . . . . . . . . 40 Wang, C. . . . . . . . . . . . . . . . . . . . . . . 74 Wang, D. . . . . . . . . . . . . . . . . . . . . . . 49 Wang, F . . . . . . . . . . . . . . . . . . 98, 101 Wang, J. . . . . . . . . . . . . . . . . . . . 45, 84 Wang, K. . . . . . . . . . . . . . . . . . . . . . . 71 Wang, N. . . . . . . . . . . . . . . . . . . . . . . 82

Wang, Q. . . . . . . . . . . . . . . . . . . . . . . 74 Wang, S . . . . . . . . . . . . . . . 61, 99, 100 Wang, W . . . . . . . . . . . . . . . 44, 77, 92 Wang, Y. . . . . . . . . . . . . . . . . . . 46, 61 Wang, Z . . . . . . . . . . . . . . . . 62, 90, 92 Watanabe, H . . . . . . . . . . . . . . . . . . . 76 Watanabe, K . . . . . . . . . . . . . . . . . 100 Watanabe, Y . . . . . . . . . . . . . . . 46, 91 Watari, H. . . . . . . . . . . . . . . . . . . . . . 83 Weck, A . . . . . . . . . . . . . . . . . . . . . . . 68 Weckman, D. . . . . . . . . . . . . . . . . . . 84 Weiland, H. . . . 38, 39, 40, 42, 43, 44, . . . . . . . 45, 47, 48, 50, 51, 53, . . . . . . . 54, 56, 57, 58, 60, 61, . . . . . . . 62, 63, 64, 66, 68, 69, . . . . . . . 70, 71, 72, 73, 74, 75, . . . . . . . 76, 77, 78, 79, 80, 81, . . . . . . . 83, 84, 85, 86, 87, 88, . . . . . . . 89, 90, 91, 92, 93, 94, . . . . . . . . . . . . . . . . . . . . . . . . 96 Wells, M. . . . . . . . . 73, 78, 84, 93, 103 Wenner, S. . . . . . . . . . . . . . . . . . 56, 71 Wen, S . . . . . . . . . . . . . . . . . . . . . . . . 90 Wen, W . . . . . . . . . . . . . . . . . . . 68, 82 Wen, X. . . . . . . . . . . . . . . . . 51, 82, 95 Westermann, I. . . . . . . . . . . . . . . . . . 81 Weyland, M. . . . . . . . . . . . . . . . . . . . 72 Wiechec, J . . . . . . . . . . . . . . . . . . . . . 74 Wilkerson, L . . . . . . . . . . . . . . . 40, 86 Win, K . . . . . . . . . . . . . . . . . . . . . . . . 39 Wittwer, L . . . . . . . . . . . . . . . . . . . . . 52 Wolf, M . . . . . . . . . . . . . . . . . . . . . . . 68 Woo, K. . . . . . . . . . . . . . . . . . . . . . . . 41 Wu, D . . . . . . . . . . . . . . . . . . . . . . . . 43 Wu, G . . . . . . . . . . . . . . . . . . . . . . . . 53 Wu, J . . . . . . . . . . . . . . . . . . . . . . . . 70 Wu, P . . . . . . . . . . . . . . . . . . . . 69, 87 Wu, X . . . . . . . . . . . . . . . . . . . . . . . . 61 Wu, Y . . . . . . . . . . . . . . . . . 46, 54, 76

X Xia, J . . . . . . . . . . . . . . . . . . . . 45, 99 Xiong, B. . . . . . . . . . . . . . . . . . 98, 101 Xiwu, L. . . . . . . . . . . . . . . . . . . . . . 101 Xu, C . . . . . . . . . . . . . . . . . . . . . . . . 92

Y

Zhu, B . . . . . . . . . . . . . . . . . . . . . . 101 Zindel, J. . . . . . . . . . . . . . . . . . . . . . . 70 Zoch, H . . . . . . . . . . . . . . . . . . . . . . . 64 Zohrabyan, D . . . . . . . . . . . . . . . . . . 56 Zolotorevskiy, V. . . . . . . . . . . . 64, 93 Zoubir, C . . . . . . . . . . . . . . . . . . . . 101 Zou, L . . . . . . . . . . . . . . . . . . . . . . . . 53 Zrnik, J. . . . . . . . . . . . . . . . . 47, 54, 72 Zuo, Y . . . . . . . . . . . . . . . . . . . . . . . . 98

Z Zajac, J. . . . . . . . . . . . . . . . . . . . . . . . 50 Zedan, Y. . . . . . . . . . . . . . . . . . . . . . 62 Zelechowski, J. . . . . . . . . . . . . . 76, 98 Zeng, Q . . . . . . . . . . . . . . . . . . . . . . . 82 Zeng, Y. . . . . . . . . . . . . . . . . . . . . . 101 Zhai, T. . . . . . . . . . . . . . 51, 68, 76, 82 Zhang, C . . . . . . . . . . . . . . . . . . . . . . 60 Zhang, H. . . . . . . . . . . . . . . . . . . . . . 38 Zhang, J. . . . . . . . . 46, 79, 85, 99, 102 Zhang, K . . . . . . . . . . . . . . . . . . 61, 87 Zhang, L. . . . . . . . . . . . . . . . . . . . . . . 39 Zhang, Q. . . . . . . . . . . . . . . . . . . . . . 53 Zhang, T. . . . . . . . . . . . . . . . . . . . . . 53 Zhang, W. . . . . . . . . . . . . . . . . . . . . . 92 Zhang, Y . . . . . . . . . . . . . . 45, 98, 101 Zhang, Z. . . . . . . . . . . . . 63, 66, 90, 94 Zhao, L. . . . . . . . . . . . . . . . . . . . . . . . 74 Zhao, M. . . . . . . . . . . . . . . . . . . . . . . 63 Zhao, Q . . . . . . . . . . . . . . . . 81, 87, 88 Zhao, S. . . . . . . . . . . . . . . . . . . . . . . . 61 Zhemchuzhnikova, D . . . . . . . . . . . 77 Zheng, C . . . . . . . . . . . . . . . . . . . . . . 75 Zheng, R. . . . . . . . . . . . . . . . . . . 43, 90 Zheng, Z. . . . . . . . . . . . . . . . . . . 93, 98 Zhen, L. . . . . . . . . . . . . . . . . 61, 69, 92 Zhong, H. . . . . . . . . . . . . . . . . . 43, 45 Zhong, S. . . . . . . . . . . . . . . . . . . . . . . 98 Zhou, T . . . . . . . . . . . . . . . . . . . . . 102 Zhou, Z . . . . . . . . . . . . . . . . . . . . . . . 41 13th International Conference on Aluminum Alloys

Index

Yamada, K. . . . . . . . . . . . . . . . . . . . . 80 Yamada, M. . . . . . . . . . . . . . . . . . . . . 91 Yamamoto, T. . . . . . . . . . . . . . . . . . . 99 Yanaga, D. . . . . . . . . . . . . . . . . . . . . . 42 Yang, H. . . . . . . . . . . . . . . . . . . . 43, 90

Yang, J . . . . . . . . . . . . . . . . . . . . . . . . 46 Yang, N. . . . . . . . . . . . . . . . . . . . . . . . 63 Yang, Y. . . . . . . . . . . . . . . . . . . . . . . . 67 Yang, z . . . . . . . . . . . . . . . . . . . . . . . . 53 Yanjun, X. . . . . . . . . . . . . . . . . . . . . . 93 Yan, L . . . . . . . . . . . . . . . . . . . . . . . . 80 Yan, Y . . . . . . . . . . . . . . . . . . . . 56, 64 Yasuda, S . . . . . . . . . . . . . . . . . . . . . . 52 Yen, C . . . . . . . . . . . . . . . . . . . . . . . . 41 Yin, H . . . . . . . . . . . . . . . . . . . . . . . . 57 Yocum, L. . . . . . . . . . . . . . . . . . . . . . 59 Yongan, Z. . . . . . . . . . . . . . . . . . . . 101 Yoon, J. . . . . . . . . . . . . . . . . . . . 40, 51 Yoshida, H. . . . . . . . . . . . . . . . . . . . . 64 Yoshida, K. . . . . . . . . . . . . . . . . . . . . 42 Yoshida, T. . . . . . . . . . . . . . . . 41, 100 Yoshihara, S. . . . . . . . . . . . . . . . . . . . 72 Yoshikawa, S . . . . . . . . . . . . . . . . . . . 41 Yoshino, M. . . . . . . . . . . . . . . . . . . . 60 Yuan, Y. . . . . . . . . . . . . . . . . . . . . . . . 43 Yu, J . . . . . . . . . . . . . . . . . . . . . . . . 41

111

Notes

NOTES

112

Map of Hotels in the Oakland/Carnegie Mellon University Area

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13th International Conference on Aluminum Alloys