|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Size Effects in a Dual Phase High Entropy Alloy
||Junaid Ahmed, Matthew Daly
|On-Site Speaker (Planned)
Reports of transformation-induced plasticity in FeMnCoCr-based high entropy alloys have generated great interest within the materials science community. As a duplex microstructure, many important mechanical properties can be traced back to size effects in the parent austenite phase and the morphology of martensitic laths. Here, we use high temperature annealing to explore the microstructure evolution and associated changes in size effects in a Fe50Mn30Co10Cr10 TRIP alloy. Post-heat treatment characterization revealed an anticipated increase in the austenite FCC grain size, combined with an increase in the HCP martensite phase fraction and decrease in lath spacing. Interestingly, mechanical testing showed an insensitivity in the yield strength to parent FCC grain growth. Our interpretation is that grain-growth induced weakening is counterbalanced by strengthening from the reduction in martensite lath spacing. In this regard, this alloy shows a remarkable resiliency to grain growth, which may be leveraged for applications in extreme temperatures.
||High-Entropy Alloys, Phase Transformations, Characterization