机械合金化制备Cu95-xCr5Zrx合金材料中Zr对显微组织及其性能的影响  

The Effect of Zr on the Microstructure and Performance of Cu95-xCr5Zrx Alloy Material Prepared by Mechanical Alloying

作　　者：王秦龙 蔡晓兰[1] 周蕾[1] 张修超 WANG Qinlong;CAI Xiaolan;ZHOU Lei;ZHANG Xiuchao(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming,650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院

出　　处：《昆明理工大学学报（自然科学版）》2019年第5期21-26,共6页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：云南省重大项目(2014FC001);云南省高校金属粉体制备与设备开发科技创新团队计划项目(14051693)

摘　　要：本研究采用X射线衍射仪、透射电镜分析机械合金化过程中Cu95-xCr5Zrx(x∈{1,3,5,7,8,9,10,12,15})粉体的物相结构演变及微观组织的变化.通过对粉体热压成型后进行拉伸试验、导电率测试、金相组织和断口形貌观察.研究不同Zr含量对Cu95-xCr5Zrx合金材料显微组织和性能的影响.结果表明:经过20~30 h机械合金化处理,Cu95-xCr5Zrx合金粉体的XRD衍射峰发生展宽,TEM电子选区衍射中多晶环特征削弱,Cr、Zr以固溶体形式存在于Cu基体中.Cu95-x Cr5Zrx合金材料导电率随着Zr质量分数的增加由55.3%IACS逐渐降低至25.1%IACS,合金试样抗拉强度呈先増后减的趋势,抗拉强度值在Zr的质量分数为8%时达到最大830.1MPa.合金材料失效方式由脆性断裂逐渐转为韧性断裂.In this study,the phase evolution and microstructure of Cu95-xCr5Zrx(x∈{1,3,5,7,8,9,10,12,15})powder during mechanical alloying were characterized by X-ray Diffraction and Transmission Electron Microscopy.The tensile test,conductivity test,microstructure and fracture morphology of the alloy prepared by hot-pressed were observed.The effects of different Zr contents on the microstructure and properties of Cu95-x Cr5Zrx alloy were investigated.The results showed that the XRD diffraction peak of Cu95-xCr5Zrx alloy powder is broadened after 20~30 h of mechanical alloying.The characteristics of polycrystalline ring in TEM electron-selective region diffraction are weakened.Cr and Zr are retained in the form of solid solution in the Cu matrix.With the addition of Zr,the conductivity of Cu95-xCr5Zrx alloy gradually decreases from 55.3% IACS to 25.1%IACS.The tensile strength of the alloy sample is increases firstly and then decreases with the increase of temperature.When the addition amount of Zr is 8%(mass fraction),the tensile strength of alloy material reaches the maximum value of 830.1MPa.The brittle fracture gradually changes into ductile fracture.

关 键 词：机械合金化 Cu-Cr-Zr粉体 球磨参数 力学性能 导电率 

分 类 号：TG146[一般工业技术—材料科学与工程] TF123[金属学及工艺—金属材料]