Microstructure and Mechanical Properties of AlNiFeCuCoCrV_x High-Entropy Alloy

AlNiFeCuCoCrV_x (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, atomic ratio) high-entropy alloys were prepared by smelting in a WK-Ⅱtype non-consumable vacuum arc furnace.The microstructures and mechanical properties of the alloys were studied. The results show that the microstructures of all the tested alloys had a typical dendritic structure, consisting of face-centered cubic (FCC) solid solution, body-centered cubic (BCC) solid solution and intermetallic compound phases. With the addition of vanadium, Fe₂AlV phase precipitated and mainly distributed in the dendrites. With increasing vanadium content, the hardness of the alloy increased first, then decreased and then increased. The addition of vanadium was not good for the compressive property of the alloy. Moreover, with increasing vanadium content, the compressive strength decreased first, then increased, and then decreased.