|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Beneficial Effect of Non-equiatomic Compositions for Long-term Stability at 500°C of CoCrFeMnNi Family of HEA
||Anna Fraczkiewicz, Michal Mroz
|On-Site Speaker (Planned)
Equiatomic CoCrFeMnNi (Cantor’s) alloy, first to be discovered and the most studied, is often considered like a model HEA. Even if its FCC single phase structure seemed to be stable, several publications have shown recently its decomposition after SPD processes, or after long annealing in 500 to 700°C. In this work, stability at 500°C of Cantor’s alloy is compared to that of Co20Cr15Fe26Mn17Ni22 “A3S” alloy. The composition of the later was optimized by thermodynamic calculation (ThermoCalc) to decrease the equilibrium temperature of decomposition of FCC: following the TC results, low temperature phase transformations in equiatomic alloy start at about 580°C while FCC is stable down to 510°C on A3S. Experimental study brings confirmation of the ienhanced stability of FCC phase in A3S at 500°C.
||Planned: Supplemental Proceedings volume