|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Strengthening of transformation-induced plasticity-assisted high entropy alloy via interstitial nitrogen
||Kenta Yamanaka, Manami Mori, Yusuke Onuki, Shigeo Sato, Akihiko Chiba
|On-Site Speaker (Planned)
Non-equimolar high-entropy alloys (HEAs) showing transformation-induced plasticity (TRIP) have a great potential as a novel class of materials with excellent mechanical properties. However, the yield strength of such alloys is generally low and needs to be improved. In this study, we examined the effect of interstitial nitrogen on the mechanical behavior of TRIP-assisted Co20Cr20Fe34Mn20Ni6 HEAs. The alloys showed single-phase fcc microstructures both in the hot-swaged and annealed states. The results of tensile testing indicated that adding trace nitrogen (0.08 mass%) significantly strengthens the alloys with maintaining good ductility. Notably, thanks to the interaction between dislocations and nitrogen atoms, the metastable parent phase of the N-doped HEA was effectively strengthened by introducing dislocations via hot deformation at the fcc stable temperatures. Accordingly, a superior strength-ductility combination was realized. The martensitic transformation kinetics and dislocation dynamics in the studied alloys under tensile loading were examined by in-situ neutron diffraction measurements.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume