AlNiFeCuCoCrVx高熵合金的显微组织与力学性能

摘要

利用WK-Ⅱ型非自耗真空电弧炉熔炼制备AlNiFeCuCoCrVx (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 原子比) 高熵合金, 研究了其显微组织和力学性能.结果表明:试验合金的组织均为典型树枝晶结构, 由面心立方 (FCC) 结构固溶体、体心立方 (BCC) 结构固溶体和金属间化合物相组成, 添加钒元素后析出了Fe2AlV相, 该相主要分布于枝晶中;随着钒含量的增加, 合金的硬度先增后降再增;添加钒对合金的压缩性能不利, 合金的抗压强度随钒含量的增加先降后增再降.%AlNiFeCuCoCrVx (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, Fe2 AlV 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.