Cu-Cr-Si合金时效强化机理及析出动力学研究  

Investigation on Strengthening Mechanism and Aging Precipitation Kinetics of Cu-Cr-Si Alloy

作　　者：杜宜博 周延军[1,2] 宋克兴[1,2] 郭慧稳 刘爱奎 DU Yibo;ZHOU Yanjun;SONG Kexing;GUO Huiwen;LIU Aikui(College of Material Science&Engineering School,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology,Henan University of Science and Technology,Luoyang 471023,China;Chinalco Luoyang Copper Processing Co.,Ltd.,Luoyang 471000,China;KMD Precise Copper Strap(Henan)Co.,Ltd.,Xinxiang 453000,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南科技大学有色金属新材料与先进加工技术省部共建协同创新中心,河南洛阳471023 [3]中铝洛阳铜加工有限公司,河南洛阳471000 [4]凯美龙精密铜板带(河南)有限公司,河南新乡453000

出　　处：《河南科技大学学报（自然科学版）》2022年第6期1-6,11,M0002,共8页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(52173297);国家重点研发计划项目(2021YFB3700704);河南省自然科学基金项目(202300410139);中国工程科技发展战略河南研究院战略咨询研究项目(2021HENZDA02);河南科技大学博士科研启动基金项目(4002/13480087)。

摘　　要：为了探究Si对Cu-Cr合金析出相的调控机理,本文开展了Cu-Cr-Si合金时效强化机理及析出动力学研究。利用透射电镜、导电率测试仪和电子拉伸试验机分别检测合金的微观组织、导电性能和力学性能。研究结果表明:合金的导电率随时效时间急剧增加,在峰时效时,导电率高达92.5%IACS,屈服强度为193 MPa;峰时效态合金析出相由面心立方结构富Cr相和有序的体心立方结构富Cr相组成,强化机制分别为位错剪切和位错绕过机制,两者协同阻碍位错运动。在此基础上,计算了Cu-Cr-Si合金在不同时效时间下的析出转变比率,建立了Cu-Cr-Si合金恒温时效条件下的析出相变动力学方程和导电率方程,并绘制了合金等温相变动力学S型曲线。To explore the regulation mechanism of Si on the precipitates of Cu-Cr alloy, the aging strengthening mechanism and precipitation kinetics of Cu-Cr-Si alloy were studied in this paper. The microstructure,electrical conductivity and mechanical properties of the alloy were detected by transmission electron microscope, electrical conductivity tester and electronic tensile testing machine, respectively. The results show that the electrical conductivity of the alloy increases sharply with the aging time. The electrical conductivity at the peak aging is as high as 92.5%IACS, and the yield strength is 193 MPa. The precipitated phases of the peak-aged Cu-Cr-Si alloy consist of the fcc Cr-rich phase and the ordered bcc Cr-rich phase, and the strengthening mechanisms are dislocation shearing and dislocation bypassing mechanisms, respectively. Both precipitates synergistically hinder dislocation slip. The Cr-rich precipitation transformation ratio of the Cu-Cr-Si alloy with different aging times is calculated, the aging precipitation kinetic equation and conductivity equation of Cu-Cr-Si alloy for constant temperature are established, and the isothermal phase transition kinetics for Sshaped curve are drawn.

关 键 词：析出相 强化机制 析出动力学 导电率 Cu-Cr-Si 

分 类 号：TG146.1[一般工业技术—材料科学与工程]