Strain rate sensitive microstructural evolution in a TRIP assisted high entropy alloy: Experiments, microstructure and modeling

Compressive response of a novel Fe38·5Mn20Co20Cr15Si5Cu1.5 high entropy alloy with transformation induced plasticity made by laser powder bed fusion was studied at quasi-static, medium and strain rates. Mechanical variation in work hardening rate were correlated ? (f.c.c.) ? ? (h.c.p.) martensitic transformation, subsequent phase evolution adiabatic heating. A strong near basal {0 0 1} texture observed the transformed after deformation initial texture, orientation relationship, as well activated mechanisms phase. The c/a ratio 1.612 for evolved this quantified to understand propensity non-basal slip activation. Metastable dominant microstructure as-built enabled excellent via accompanied activation twinning. Experimental results existing empirical constitutive models such Johnson-Cook, Modified Zerilli-Armstrong, Khan-Huang-Liang Khan-Liu; Khan-Liu model evidenced best correlation experimental results.