The microstructure, mechanical properties, and corrosion resistance of Fe₅₀Mn₂₅Cr₁₅Ni_10-xCo_x 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.

_{Fe 50} Mn ₂₅ Cr ₁₅ Ni _10-x Co _x的显微组织、力学性能和耐蚀性本研究研究了具有不同 Co 和 Ni 含量的中熵合金 (MEA)。随着Co浓度的增加，MEA的微观结构从FCC单相转变为FCC + HCP双相。在室温下，Co 浓度的升高会增加 MEA 的强度和延展性，而在液氮温度下，延展性以及 MEA 的拉伸强度和延展性的乘积会显着降低。此外，MEA的耐腐蚀性随着Co含量的增加而显着降低。该工作为进一步开发具有优异机械性能和耐腐蚀性的低成本MEA提供了研究对象。