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采用真空电弧熔炼法制备了CoCrFeNiVx高熵合金(x为V与Co的摩尔比),通过金相观察、X射线衍射、扫描电镜、显微硬度检测和压缩试验等研究了V含量对合金组织及力学性能的影响。结果表明,当x≤0.5时,合金为单一的FCC晶体结构,组织为典型的树枝晶;随着x的增大,合金组织由树枝状向颗粒状转变,并在晶界形成了Co1.9V3.1的金属间化合物。当x≥1时,合金的晶体结构转变为由FCC、BCC和金属间化合物组成的混合结构;CoCrFeNiVx高熵合金的硬度随x的增加而增大,同时塑性降低、脆性增大。
CoCrFeNiVx high entropy alloy (x is the molar ratio of V to Co) was prepared by vacuum arc melting method. The effects of V content on the microstructures and mechanical properties of the alloy were investigated by metallographic observation, X-ray diffraction, scanning electron microscopy, microhardness test and compression test. Effect of mechanical properties. The results show that when x is less than or equal to 0.5, the alloy is a single FCC crystal structure with typical dendritic structure. With the increase of x, the alloy structure changes from dendritic to granular, and the grain boundary forms Co1.9V3 .1 intermetallic compounds. When x≥1, the crystal structure of the alloy is transformed into a mixed structure composed of FCC, BCC and intermetallic compounds. The hardness of CoCrFeNiVx high-entropy alloy increases with the increase of x, and the plasticity decreases and the brittleness increases.