The effect of Co substitutions for Ni on microstructure, mechanical properties and corrosion resistance of Fe50Mn25Cr15Ni10 medium-entropy alloy

Abstract

The microstructure, mechanical properties, and corrosion resistance of Fe50Mn25Cr15Ni10-xCox medium-entropy alloys (MEAs) with varying Co and Ni contents were investigated in this study. With increasing Co concentration, the microstructure of the MEAs changes from FCC single phase to FCC + HCP dual-phase. At room temperature, a rise in Co concentration increases the strength and ductility of the MEAs, while at liquid nitrogen temperature, the ductility, and the product of tensile strength and ductility of the MEAs decrease significantly. Furthermore, the corrosion resistance of the MEAs decreases significantly with increasing Co content. This work provides a research object for the further development of low-cost MEAs with excellent mechanical properties and corrosion resistance.