Deformation Rate and Temperature Sensitivity in TWIP/TRIP VCrFeCoNi Multi-Principal Element Alloy

High-entropy alloys (HEAs) and medium-entropy (MEAs), also sometimes referred to as multi-principal element (MPEAs), present opportunities develop new materials with outstanding mechanical properties. Through the careful selection of constituent elements along optimized thermal processing for proper control structure, grain size, deformation mechanisms, many newly developed HEA systems exhibit superior strength ductility levels across a wide range temperatures, particularly at cryogenic temperatures. Such remarkable response has been attributed hardening capacity MPEAs that is achieved through activation twinning. More recent compositions have considered phase transforming systems, which potential enhanced strengthening therefore high levels. However, strain rate sensitivity such not well understood requires further investigation. In this study, tensile properties non-equiatomic V10Cr10Fe45Co30Ni5 MPEA were investigated different rates temperatures ranging from 77 K (?196 °C) 573 (300 °C). Depending on temperature, exhibits plasticity either crystallographic slip, twinning, or solid-state transformation. At 300 °C, only slip-mediated was observed all rates. Deformation twinning detected in samples deformed room while face-centered cubic body-centered transformation became more favorable The trends are nonlinear twinning-induced (TWIP) favored intermediate rate, transformation-induced (TRIP) observed, although limited, slowest rate. For significant TRIP activity always detected. extent TRIP, however, dependent Increasing conducive thus hinders capacity.