Cr对标准阴极铜组织与力学性能的影响.pdfVIP

学兔兔 一 画 有色合金及压铸 C r对标准阴极铜组织与力学性能的影响 谭志强 ，范晓明z，方 东 (1．湘潭电机力源铸造有限公司，湖南 湘潭 4111O1；2．武汉理工大学材料科学与工程学院，湖北 武汉 430070) 摘要：在大气环境下采用普通中频感应电炉熔炼制备了Cu-Cr合金，研究了铬对标准阴极铜组 织与力学性能的影响，Cr的加入量分别为0．30％、O．5 3％、0．7 6％和0．99％。结果表明，在本实 验条件下，cr可以有效地加入到Cu液中。铸态及固溶时效Cu-Cr合金中只存在仅一cu相与cr相。 铸态时部分cr溶于基体中，部分cr以第二相形式存在；固溶时效后基体中可分解析出更多弥散 分布的cr相。Cr元素对纯铜有强化作用，合金的铸态和热处理态试样的拉伸强度及硬度均随cr 元素加入量的增大而增加。固溶时效热处理能有效提高铸态Cu-Cr合金的力学性能。 关键词：cu—cr合金；固溶时效；显微组织；力学性能 中图分类号：TG146．1 1 文献标识码：A 文章编号：1673-3320(2009)02—0034—03 Effect of Chromium on Mechanical Properties of Pure Copper Tan Zhiqiang ，Fan Xiaoming ，Fang Dong (1．LiyuanCastingCo．，Ltd．，XiangtanElectromotorCo．，Xiangtan411101，Hunan，China；2．Schoolof Materials Science and Engineering，Wuhan University ofTechnology,Wuhan 430070，Hubei，China) Abstract：CU—Cr alloys were prepared with common medium frequency induction furnace in the air． The effects of various chromium addition content(∞(Cr)=0．30％，0．53％，0．76％，O．99％1 on mechanical properties of pure copper were studied．The results show that chromium has been added into pure copper successfully．The existent phases of alloys in as—cast and after heat treatment are 6c—CU and C Some amount of chromium forlTl solution with CU in as—cast alloy,and the residual chromium exists in the form of Cr．More dispersed Cr phases are precipitated in matrix after solution and aging．The addition of chromium can improve the mechanical properties of pure copper，both tensile strength and hardness of as．cast alloys and alloys after heat treatment are improved with the increase of chromium．Solution and aging treatment lead to obvious increase in the tensile s