Phase selection of BCC/B2 phases for the improvement of tensile behaviors in FeNiCrAl medium entropy alloy

Abstract

With excellent compressive mechanical properties, FeNiCrAl medium entropy alloys with multi-principal components have attracted extensive attention in recent years. However, the limited tensile ductility of FeNiCrAl medium entropy alloys is the bottleneck for their industrial applications. In this work, dual phases of FCC + B2 and BCC + B2 were modulated in FeNiCrAl medium entropy alloys for excellent tensile behaviors. In the as-cast state, the tensile yield strength and ultimate tensile strength are 1140 MPa and 1423 MPa, respectively, with a uniform elongation of 6.0%. • As-cast dual phases FeNiCrAl medium entropy alloys are designed for excellent tensile behavior. • Dual phases of FCC+B2 and BCC+B2 are modulated by changing the valence electron concentration via the ratio of Fe/Ni. • Fe 47 Ni 26 Cr 10 Al 17 alloy has a fine nanostructure with BCC+B2 dual phases. • As-cast Fe 47 Ni 26 Cr 10 Al 17 alloy shows yield strength of 1140 MPa and uniform elongation of 6.0%.