Fabrication of high-strength dual FCC phase Co-Cr-Fe-Ni-Cu-Mo high entropy alloy by plasma arc additive manufacturing using a combined cable wire

Abstract

FCC phase High-entropy alloys (HEAs) has excellent plasticity and toughness but low tensile property. To strengthen the HEA without plasticity reducing, Cu28.36 Ni22.32 Fe19.12Co15.17Cr12.26Mo2.77 HEA with dual FCC phase were successfully prepared by plasma arc additive manufacturing using a combined cable wire with multi-element composition. The results show that the prepared alloys were composed of Cu-poor FCC1 and Cu-rich FCC2, along with a small amount of Mo-rich precipitation phases. The ultimate tensile strength, yield strength is 531 MPa, 332 MPa, it is increased by 14.48 % and 32.75 % compared with arc melting technology with excellent elongation of 32.26 %. Compared with the vacuum induction melting technology, the strength is increased by 276.5 %. Dual phase obviously increased the mechanical properties. The Co and Cr element in the alloy is relatively low, which can reduce the production cost.