Effects Of Al And Mn On Microstructure, Magnetic And Mechanical Properties Of Fe40co40ni10m10 (M=Al, Mn) Medium Entropy Alloys

The influences of Al and Mn on microstructure, magnetic and mechanical properties of Fe40Co40Ni10M10 (M = Al and Mn) medium entropy alloys (MEAs) have been systematically investigated. It is found that the Fe40Co40Ni10Al10 has body-centered cubic (BCC) structure and Fe40Co40Ni10M10 has a mixture of face-centered cubic (FCC) and BCC structures in as-cast state, while the former one changes to FCC + BCC dual-phase structure after heat treatment at 1073 K for 1 h. Fe40Co40Ni10Al10 displays higher saturated magnetization (B-s) as compared to Fe40Co40Ni10M10 in as-cast state, while heat treatment significantly enhances B-s of Fe40Co40Ni10M10. Besides, it is intriguing that Fe40Co40Ni10M10 shows higher yield strength and plasticity compared to Fe40Co40Ni10Al10, while heat treatment could enhance comprehensive mechanical properties of this series of MEAs. In addition, the B-s of heat-treated Fe40Co40Ni10M10 is 187.9 emu/g, which is among the highest in the reported ferromagnetic HEAs/MEAs. The correlation among the composition, phase evolution, magnetic properties, and mechanical properties in these MEAs is discussed in detail. This work provides a novel route for developing high-performance ferromagnetic HEAs/MEAs. (C) 2021 Elsevier B.V. All rights reserved.