Microstructure and mechanical properties of dual wire-arc additive manufactured Al-Co-Cr-Fe-Ni high entropy alloy

In this paper, a combined cable wire (CCW) composed of 7 wires and an aluminum welding wire are simulta-neously used for arc additive manufacturing of non-equimolar Al-Co-Cr-Fe-Ni high-entropy alloy. The differences in microstructure and mechanical properties of the upper, middle, and lower parts of the high-entropy alloy were systematically studied. The results show that the sample contains FCC phase and BCC phase. With the increase of distance from substrate, the heat gradually accumulates, and apart of FCC (face centered cubic) is transformed into BCC (body centered cubic) in Al-Co-Cr-Fe-Ni high-entropy alloy. The increase of BCC improves the microhardness (from 281.86HV to 310.38HV), yield strength (from 514 MPa to 656 MPa) and ultimate tensile strength (from 916 MPa to 1087 MPa).

Automated summary

In this study, a combined cable wire and an aluminum welding wire were used for arc additive manufacturing of non-equimolar high-entropy alloy, and the differences in microstructure and mechanical properties in different parts of the alloy were systematically studied. The results showed that the alloy contained FCC phase and BCC phase, and with the increase of distance from the substrate, part of the FCC transformed into BCC. The increase of BCC improved the microhardness, yield strength, and ultimate tensile strength of the alloy.