|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High Entropy Alloys IV
||A Non-equiatomic, Dual-phase, TRIP-assisted HEA
||Cem Tasan, Zhiming Li, Dierk Raabe
|On-Site Speaker (Planned)
We introduce a non-equiatomic variation of the FeMnNiCoCr high entropy alloy (HEA) system that reveals a compositionally-homogeneous dual-phase microstructure and undergoes mechanically-induced phase transformation. This novel HEA was synthesized via casting, hot-rolling and homogenization followed by water-quenching. Microstructural characterization shows a solid solution containing FCC and HCP phases with the identical uniformly distributed elements. The coupling of electron channeling contrast imaging (ECCI) with electron backscatter diffraction (EBSD) shows a relatively high density of stacking faults in the as-quenched state. Investigations of the deformation microstructures reveal the transformation from FCC to HCP phase to be the dominant deformation mechanism. Moreover, coupling with the other deformation mechanisms (i.e., formation of stacking faults and dislocation slip in FCC phase, deformation induced nanotwinning and dislocation slip in HCP phase) in the dual-phase HEA results to the exceptional mechanical properties, which are superior to those corresponding to the single-phase HEAs.
||Planned: A print-only volume