A novel Fe-Co-Ni-Si high entropy alloy with high yield strength, saturated magnetization and Curie temperature

A novel Fe₄₀Co₄₀Ni₁₀Si₁₀ high entropy alloy (HEA) was designed and fabricated via copper mold casting. It is found that, this alloy is mainly composed of fine lamella-like BCC phase, as well as minor droplet-like FCC phase. This HEA exhibits excellent yield strength of ~1.1 GPa, compressive plasticity of ~38.3%, saturated magnetization of 172 emu/g and Curie temperature of 1169 K, which has significant improvement compared to those of the reported ferromagnetic HEAs, indicating good comprehensive performance combining excellent mechanical and magnetic properties. This study proposes a new approach for the design of high-performance HEAs for functional applications.