微量元素铈对Cu0．9％Cr合金组织与性能的影响  

Effects of Tace Cerium Addition on Microstructure and Properties of Cu0.9%Cr Alloy

作　　者：茹立军[1] 李文有[1] 李文生[2] 李亚明[1,2] Ru Lijun;Li Wenyou;Li Wensheng;Li Yarning(Chemical Engineering Department,Jiuquan Vocational and Technical College,Jiuquan 735000,China;State Key Lab of Advanced Nonferrous Materials,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]酒泉职业技术学院化学工程系,甘肃酒泉735000 [2]兰州理工大学有色金属新材料省部共建国家重点实验室,甘肃兰州730050

出　　处：《中国稀土学报》2018年第5期615-620,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(51165021);甘肃省中小企业创新基金项目(X201115)资助

摘　　要：采用石墨型铸造Cu0. 9%Cr,Cu0. 9%Cr0. 05Ce两种合金,并对合金固溶后在450℃进行不同时间的时效,利用光学显微镜、扫描电镜、导电率测量仪、电子拉伸试验机以及往复摩擦磨损试验机,研究微量Ce对Cu0. 9%Cr合金微观组织、强度、导电率和摩擦磨损的影响。结果表明:在时效前期,微量Ce的加入使Cu0. 9%Cr合金组织细化、Cr析出相增且更均匀分布,经450℃时效+4 h可达到抗拉强度峰值590 MPa,导电率达到83%IACS,且具有优异的耐磨性能;在时效后期,微量Ce的添加主要起到抑制过时效的作用,抗拉强度值下降缓慢、导电率平稳变化。Cu-0.9Cr and Cu-0.9Cr-0.05Ce were fabricated by graphite sand casting. The studied alloy was treated by solution and aging with different aging time. Effects of trace Ce additions on microstructure, tensile strength, conductivity and frictional and wear property were investigated by means of optical microscope （ OM）, scanning electron microscopy （ SEM）, conductivity meter, MTS test works software and a to-and-fro wear test apparatus. The results indicated that the trace addition of Ce can refine primary Cu0.9% Cr microstructure and Cr particles u- niformly distributed in the alloy during earlier period of aging. The peak strength and electric conductivity of Cu0.9Cr0.05Ce alloy occurs at about 450 ℃ for 4 h after aging, which is 590 MPa and 83% IACS, respectively. It has better friction and wear properties. During the posterior period aging treatment, the trace addition of Ce de- clines tensile strength gradually, changes conductivity smoothly and retards over-aging.

关 键 词：微量CE 时效处理 微观组织 导电率 摩擦磨损 

分 类 号：TG146.4[一般工业技术—材料科学与工程]