A novel high performance eutectic medium-entropy alloy with nanoprecipitates

Eutectic medium-entropy alloys (EMEAs) have excellent plasticity but low strength. In this study, we designed and prepared a novel non-equiatomic Fe20Cr20Ni30Al30 EMEA with a large number of nanoprecipitates, to achieve the synergy between high strength and large plasticity of the EMEA. It exhibits excellent comprehensive compressive mechanical properties, of which the compressive yield strength, fracture strength and fracture strain can reach 1154.5 MPa, 3178.4 MPa and 38.5%, respectively, superior to many conventional EHEAs (eutectic high-entropy alloys) and EMEAs, which can be attributed to the novel heterogeneous eutectic structure and the nanoprecipitates that result in additional strengthening without sacrificing plasticity.

Automated summary

In this study, a novel non-equiatomic EMEA with a large number of nanoprecipitates was designed and prepared to achieve the synergy between high strength and large plasticity of the EMEA. The EMEA exhibits excellent compressive mechanical properties, surpassing many conventional EHEAs and EMEAs, due to its novel heterogeneous eutectic structure and nanoprecipitates.