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Min Ji Jang,Hyunjeong Kwak,Ye Won Lee,Youjin Jeong,Jahong Choi,Yong Hee Jo,Won-Mi Choi,Hyun Je Sung,Eun Yoo Yoon,S. Praveen,Sunghak Lee,Byeong-Joo Lee,Mohamed Ibrahim Abd El Aal,Hyoung Seop Kim 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
A single FCC phase 40Fe–25Ni–15Cr–10Co–10V high-entropy alloy was designed, fabricated, and evaluated for potentialcryogenic applications. The alloy forms a single FCC phase and exhibits higher yield strength, tensile strength, and elongationat cryogenic temperature (77 K) than at room temperature (298 K). The superior tensile properties at cryogenic temperatureare discussed based on the formation of deformation twins during the tensile test at cryogenic temperature. In addition, aconstitutive model reflecting the cryogenic deformation mechanism (i.e., twinning-induced plasticity) was implementedinto the finite element method to analyze this behavior. Experimental results and the finite element analysis suggest that theincrease in plastic deformation capacity at cryogenic temperature contributes to the formation of deformation twins.