Microstructures and mechanical properties of Co2MoxNi2VWx eutectic high entropy alloys

Abstract In this paper, Co 2 Mo x Ni 2 VW x (x = 0.5, 0.6, 0.8, 1.0, 1.5, and 1.75 in molar ratio) eutectic high entropy alloys (EHEAs) were designed to achieve a combination of strength and ductility. The effects of Mo and W elements on the microstructures and mechanical properties of the alloys were investigated, and results showed that by decreasing the Mo and W contents to 0.8 in Co 2 Mo x Ni 2 VW x alloy, a fully eutectic microstructure was obtained. By increasing the Mo and W contents to 1.75, a primary BCC solid solution phase plus eutectic microstructure were obtained. The eutectic microstructure consisted of a mixture of FCC solid solution phase and μ phase. The Co 2 Mo 0·8 Ni 2 VW 0.8 alloy with the largest volume fraction of eutectic microstructure exhibited the highest compression strength of 2364 MPa, while the Co 2 Mo 1·75 Ni 2 VW 1.75 alloy with the largest volume fraction of BCC phase exhibited the highest yield strength of 1607 MPa.