A novel Fe-rich Fe-Cr-Ni-Si-Al high-entropy alloy with low-cost and outstanding as-cast mechanical properties

A novel Fe2CrNiSi0.3Al0.28 high-entropy alloy (HEA) was designed and produced via arc-melting. This Co-free Fe -rich HEA mainly consists of bulky body-centered cubic (BCC) structure and branches of fine needle-like face -centered cubic (FCC) particles. Moreover, this as-cast HEA exhibits the ultimate tensile strength (UTS) of-1.3 GPa and plasticity of-9%. Compared to the typical ductile as-cast HEAs, it shows among the highest UTS and lowest cost. Heterostructure exhibits positive influence on its high mechanical properties. This work provides a novel insight for propelling broad applications of HEAs.

Automated summary

A novel Fe2CrNiSi0.3Al0.28 high-entropy alloy (HEA) with a Co-free Fe-rich composition and a heterogeneous microstructure was successfully produced via arc-melting. The as-cast HEA exhibits outstanding mechanical properties, including a high ultimate tensile strength of 1.3 GPa and a reasonable plasticity of 9%, which surpass typical ductile HEAs. This research provides valuable insights for the further applications of HEAs.