Texture Evolution During Dynamic Loading of ECAP Tantalum

A Taylor Impact experiment was conducted on commercially pure Ta subjected to thermo-mechanical processing that included Equal Channel Angular Pressing (ECAP), forging and annealing. The recovered specimen profile geometry was measured to characterize the extent of plastic anisotropy. Electron Backscattered Diffraction (EBSD) was used to characterize the texture evolution under dynamic loading. The as forged and annealed texture consisted of (111) [1-21] and (111) [-1-12] texture components. A series of EBSD crystal direction maps along the axial length of the specimen revealed that the texture evolution was described by a 19.5 degree rotation about the [-110] and [10-1] axes. This rotation was sufficient to bring {111} texture components of the original disk into alignment with the compression axis of the Taylor Impact specimen. Prepared in collaboration with the University of Florida, Shalimar, FL.