Y对WTaCrVTi高熵合金的组织结构与力学性能的影响  

Effect of Y on the microstructure and mechanical properties of WTaCrVTi high-entropy alloys

作　　者：陈时杰 张世荣 薛丽红[1] 严有为[1] 张五星[1] CHEN Shijie;ZHANG Shirong;XUE Lihong;YAN Youwei;ZHANG Wuxing(State Key Laboratory of Materials Processing and Die and Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院,材料成形与模具技术国家重点实验室,武汉430074

出　　处：《复合材料学报》2025年第2期1105-1112,共8页Acta Materiae Compositae Sinica

基　　金：国家磁约束核聚变能发展研究专项(2018YFE0306104);材料成形与模具技术国家重点实验室开放课题研究基金(P2023-024)。

摘　　要：WTaCrVTi高熵合金具有良好的力学性能和抗辐照性能,且各组元具有低中子活化特性,可用于核聚变堆的中子辐照环境中,因此,该合金在核聚变堆中具有潜在的应用前景。但该合金在制备过程中易发生元素偏析和富集,造成组织结构不均匀,为了提高组织结构的均匀性,采用机械合金化法结合放电等离子体烧结技术制备了WTaCrVTi_(6)Y_(x)高熵合金,研究了Y对合金的组织结构和力学性能的影响。结果表明:未添加Y的合金包含固溶体、TiO、Laves相和富Ta相。具有BCC结构的固溶体为基体,其中W、Ta、Cr、V的原子比趋于等原子比;TiO颗粒的平均尺寸为(1.08±0.38)μm,均匀分布在基体中;Laves相和富Ta相零星分布在基体中。而添加了6at%Y的合金主要包含BCC结构的固溶体和Y_(2)O_(3)颗粒,Y_(2)O_(3)颗粒的平均尺寸约为(1.25±0.85)μm,固溶体的W、Ta、Cr、V的原子比趋于1,该合金的室温压缩屈服强度和硬度分别为2674 MPa和HV(848.6±9.3)。WTaCrVTi high entropy alloys have excellent mechanical properties and irradiation resistance,and the individual components have low neutron activity,which can be used in the neutron irradiation environment of nuclear fusion reactors.Thus,they have potential applications in nuclear fusion reactors.However,elemental segregation and enrichment exist in the alloys during the preparation process,resulting in an inhomogeneous microstructure.In order to improve the homogeneity of the microstructures,mechanical alloying combined with spark plasma sintering was adopted to prepare WTaCrVTi_(6)Y_(x) high entropy alloys.The effects of Y content on the microstructure and mechanical properties of high-entropy alloys were explored.It is found that the alloys without Y addition include the solid solution,TiO particles,laves phases and Ta-rich phases.The solid solution with BCC structure is the matrix,and the atomic ratios of W,Ta,Cr and V are close to be equal.The TiO particles are uniformly distributed in the matrix with an average particle size of(1.08±0.38)μm.The laves and the Ta-rich phases are sporadically distributed in the matrix.While,the alloys with the addition of 6at%Y is mainly composed of the solid solution with BCC structure and Y_(2)O_(3)particles.The average size of Y_(2)O_(3)particles is about(1.25±0.85)μm.And the atomic ratios of W,Ta,Cr,and V in the BCC phase tend to be 1.The room-temperature compressive yield strength and hardness of this alloy reach 2674 MPa and HV(848.6±9.3),respectively.

关 键 词：难熔高熵合金 机械合金化 放电等离子体烧结 微观结构 均匀性 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]