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A series of CoFeNiVMo_y (y = 0–1) and CoFeNi_xVMo (x = 1–2) high entropy alloys were designed in order to study the effect of Mo and Ni elements on their microstructure evolution and mechanical properties. Results show that for the quinary CoFeNiVMo alloy, by either decreasing the Mo content to 0.6 or increasing the Ni content to 1.4, eutectic microstructures can be obtained. For the CoFeNiVMo_y alloys, with increasing Mo content, the volume fraction of the CoMo₂Ni-type intermetallic phase increases which results in a decrease of the plastic strain and an increase of the yield strength, and the Vickers hardness shows an approximately linear increase from HV 238.1 to HV 624.6. While for the CoFeNi_xVMo alloys, with increasing Ni content, the increased FCC solid solution phase leads to an increase of the plastic strain and a decrease of the yield strength. Among these alloys, the CoFeNiVMo_0.2 alloy shows the …