1.7 GPa tensile strength in ferrous medium entropy alloy via martensite and precipitation

Abstract A Fe50Co25Ni10Al5Ti5Mo5 medium entropy alloy was fabricated through the casting route and processed by hot rolling and heat treatment to achieve high strength via martensitic structure and precipitation. The hot-rolled plate heat-treated at 1000 oC for 10 min exhibited fine martensitic lath structure, two kind of precipitates, retained FCC phase, and high dislocation density. The sample with this complex microstructure exhibited superior tensile properties with an extremely high tensile strength of ∼1.7 GPa and a good uniform elongation of ∼8%.