|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Investigation of Plastic Deformation Modes in Al0.1CoCrFeNi High Entropy Alloy
||Deep Choudhuri, Mageshwari Komarasamy, Victor Ageh, Rajiv S Mishra
|On-Site Speaker (Planned)
Mechanisms contributing to the plastic deformation of coarse grained (CG), and friction-stir-processed fine grained (FG) fcc-based Al0.1CoCrFeNi HEA were investigated. In the grain interiors of CG, deformation primarily occurred via planar slip of undissociated ½ <011> dislocations on parallel (111) planes. Stacking faults were also detected, and they appeared to have contributed to the formation of parallel (111) slip-bands. The deformed FG microstructure was dominated by dislocation cells, which suggested that proximity to the grain-boundaries have substantially influenced dislocation arrangements. Interestingly, nanoscale deformation twins were unambiguously observed in both deformed FG and CG microstructures, and that such twins did not emanate from grain boundaries. These twins invariably comprised of two variants, which lay on two different (111) habit planes oriented by ~70 ̊ from each other. The formation of such two-variant deformation twinning provides an additional plastic deformation mode, and is expected to improve the work hardening of Al0.1CoCrFeNi HEA.
||Planned: Supplemental Proceedings volume