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Dr. Carl Frick, Assistant Professor of Mechanical Engineering, holding calibration specimens for the Agilent Nano Indenter G200 he uses for characterizing mechanical behavior at sub-micron scales.

procedures to fabricate bulk single crystal specimens, the proposed approach utilized a focused ion beam (FIB) to manufacture small-scale compression pillars on the surface of a more conventional polycrystal. Pillars were cut from individual grains, allowing for over a hundred “single crystal” compression tests from one polycrystalline sample surface. Compressive testing was performed using a nanoindenter equipped with a flat punch. Representative pillars were sectioned and transmission electron microscopy (TEM) was used for direct investigation of the microstructure. For this pilot work, deformation behavior of ß-brass (CuZn) was chosen. TEM analysis clearly revealed the formation of kink www.nasa.gov/epscor/stimuli

bands, resulting in an “S” shaped deformation observed. This observation is entirely unique, and the subject of our continued research focuses. The proposed research aligns well with the goals of NASA’s Aeronautics Research Mission Directorate. Continuing need for higher performance and efficiency in propulsion have created a strong demand better for high-temperature materials. Some immediate applications in spaceflight include combustion chambers for advanced chemical rockets and turbo-machinery for jet engines and power conversion in nuclear-electric propulsion.

NASA EPSCoR Stimuli 2014-15

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EPSCoR Stimuli 2014-15  

NASA Office of Education’s Aerospace Research & Career Development (ARCD) is pleased to release NASA EPSCoR Stimuli, a collection of univers...

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