Grain Rotations during Tensile Deformation of Columnar Tantalum
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Grain Rotations during Tensile Deformation of Columnar Tantalum B.S. El-Dasher, B. L. Adams1, and A. D. Rollett Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15032, USA 1 Mechanical Engineering, Brigham Young University, Provo, UT 84602, USA
ABSTRACT We report on tensile tests performed on thin sheet samples of tantalum that have a nearcolumnar structure. By annealing sheet of approximately 1 mm thickness at high temperatures, a columnar structure is generated with grain boundaries nearly perpendicular to the flat surfaces. The purpose of the experiments is to investigate the mechanical behavior in terms of crystal plasticity in a geometry that is readily amenable to both experimental characterization and computer simulation. Automated electron backscatter diffraction (EBSD) has been used to obtain orientation maps both before and after deformation. For the small strains used in this study (
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