Low Cycle Fatigue Behaviour of Non-equiatomic TRIP Dual-phase Fe50Mn30Co10Cr10High Entropy Alloy

Abstract Low cycle fatigue behavior of F e 50 M n 30 C o 10 C r 10 metastable dual-phase (FCC + HCP) high entropy alloy is characterized by deformation-induced martensitic transformation from FCC to HCP phase at lower strain amplitude of 0.3% and 0.6% while at higher strain amplitude of 0.9% and 1.2%, profuse extension twinning in HCP phase is observed with some reverse HCP to FCC transformation. The presence of multiple deformation mechanisms like planar slip and deformation twinning in both the phases along with bidirectional phase transformation contributes to a hierarchically refined microstructure. This provides an avenue for microstructural engineering to achieve excellent tensile and low cycle fatigue performance of F e 50 M n 30 C o 10 C r 10 .