微量Ni元素添加对Cu-Cr合金析出行为及性能的影响  

Effect of trace Ni element addition on precipitation behavior and properties of Cu-Cr alloy

作　　者：吴凡 龚清华 谢伟滨[1,3] 吴语 陈辉明 汪航[2] Wu Fan;Gong Qinghua;Xie Weibin;Wu Yu;Chen Huiming;Wang Hang(Advanced Copper Industry Institute,Jiangxi University of Science and Technology,Yingtan Jiangxi 335000,China;Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou Jiangxi 341000,China;National Rare Earth Functional Materials Innovation Center,Ganzhou Jiangxi 341000,China;Institute of Applied Physics,Jiangxi Academy of Sciences,Nanchang Jiangxi 330096,China)

机构地区：[1]江西理工大学先进铜产业学院,江西鹰潭335000 [2]江西理工大学材料冶金化学学部,江西赣州341000 [3]国家稀土功能材料创新中心,江西赣州341000 [4]江西省科学院应用物理研究所,江西南昌330096

出　　处：《金属热处理》2023年第7期49-54,共6页Heat Treatment of Metals

基　　金：江西省青年井冈学者计划;江西理工大学高层次人才科研启动项目;江西省科学院引进博士项目(2023YYB06);江西省产业链科技创新联合体揭榜挂帅项目(20224BBE51047)。

摘　　要：采用真空熔炼设备在氩气环境下制备了Cu-Cr和Cu-Cr-Ni合金,然后进行950℃×1 h固溶和450℃时效处理。使用维氏硬度计、直流数字电阻测试仪、光学显微镜和透射电镜对两种合金的性能和组织进行了分析和表征。结果表明,Cu-Cr-Ni合金在450℃时效8 h后的硬度达到峰值,为124.6 HV0.5,此时导电率为83.2%IACS,而Cu-Cr合金在450℃时效1 h后的硬度达到峰值,为116.7 HV0.5,说明Ni的添加提高了Cu-Cr合金的硬度,且能保持较高的导电率。Cu-Cr-Ni合金在时效初期(1 h)即观察到bcc-Cr相,表明Ni的添加加快了析出相的析出速率,并促进析出相由fcc-Cr结构向bcc-Cr结构转变。另外,Cu-Cr-Ni合金在时效12 h后Cr析出相仍与基体保持半共格关系。Cu-Cr and Cu-Cr-Ni alloys were prepared by vacuum melting in argon atmosphere,followed by solid solution at 950 ℃ for 1 h and aging at 450 ℃.The properties and microstructure of the two alloys were analyzed and characterized by means of Vickers hardness tester,DC digital resistance tester,metallographic microscope and transmission electron microscope(TEM).The results show that the hardness of the Cu-Cr-Ni alloy reaches the peak value of 124.6 HV0.5 after aging at 450 ℃ for 8 h,and the conductivity is 83.2%IACS,while the hardness of the Cu-Cr alloy reaches the peak value of 116.7 HV0.5 after aging at 450 ℃ for 1 h,which indicates that the addition of Ni increases the hardness of the Cu-Cr alloy and maintains a high conductivity.At the beginning of aging(1 h),bcc-Cr phase is observed in the Cu-Cr-Ni alloy,which indicates that the addition of Ni accelerates the precipitation rate of precipitates,and promotes the transformation of precipitates from fcc-Cr structure to bcc-Cr structure.In addition,the Cr precipitates of the Cu-Cr-Ni alloy still maintain a semi-coherent relationship with the matrix after aging for 12 h.

关 键 词：Cu-Cr-Ni合金 析出相 硬度 导电率 

分 类 号：TG146.1[一般工业技术—材料科学与工程]