Dynamic precipitation-induced the negative strain rates sensitivity in VCoNi medium-entropy alloy

摘要

The tensile behavior of VCoNi medium-entropy alloy with FCC single phase has been studied in the displacement rates range of 0.05 to 50 mm/min. The results showed that the yield strength and ultimate tensile strength of alloy decrease with increased displacement rate. Microscopic characterization revealed that dynamic precipitation of V-rich r phase was responsible for the negative strain rates sensitivity of VCoNi alloy. The mechanism of V-rich r phase precipitation has also been analyzed.(c) 2021 Elsevier B.V. All rights reserved.