|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High Entropy Alloys IV
||Thermally Activated Processes in a Crystal Plasticity Model for Deformation in Equiatomic Alloys
||Yanfei Gao, Hongbin Bei, Zhenggang Wu, George M Pharr
|On-Site Speaker (Planned)
A large class of equiatomic or near equiatomic alloys with more than three elements and random solid-solution FCC structures has been recently developed. These alloys exhibit an unusual temperature-dependent flow stress, an unusual hardening behavior with respect to the crystallographic orientation, and extraordinary ductility at cryogenic conditions. Experimental measurements suggest the lattice friction be the dominant mechanism, which is modeled by the motion of non-straight dislocations by thermally activated processes involving local bowing of the dislocation lines. Although this process resembles that in BCC crystals, the hardening behavior exhibits multiple hardening stages as in FCC metals. A crystal plasticity model is developed to include these features and compared to experimental stress-strain responses for various orientations of single crystals at room and cryogenic temperatures.
||Planned: A print-only volume