Theoretical evaluation of solid solution interaction in Fex(CoCrMnNi)100-x medium- and high-entropy alloys

Abstract

Solid solution interaction in medium- and high-entropy of Fex(CoCrMnNi)100-x (x = 20, 40, 50, and 60 at. %) alloys was evaluated theoretically. The different Fe contents were found to affect the yield strength (σy) of the Fex(CoCrMnNi)100-x system, with higher Fe content leading to reduced σy. The focus of this study was to investigate, using various theoretical approaches, the effect of different Fe contents on the solid solution interaction in the Fex(CoCrMnNi)100-x system. The theoretical approaches demonstrated a decreasing atomic size misfit with increasing Fe content, which reduced lattice distortion. The critical resolved shear stress for slip to occur also decreased with increasing Fe content, leading to the least solid solution contribution with higher Fe content in the Fex(CoCrMnNi)100-x system. The solid solution interaction of the Fex(CoCrMnNi)100-x system at lower temperature was also observed, showing good agreement with the results obtained at room temperature.