压缩量对单晶铜冷压焊接接头组织及性能的影响  

Effect of Compression on Microstructure and Properties of Single CrystalCopper Cold Pressure Welding Joints

作　　者：黄勇[1,2] 冉小龙 严晓娟 HUANG Yong;RAN Xiaolong;YAN Xiaojuan(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Nonferrous Metal Alloys and Processing of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《材料导报》2020年第12期12110-12114,共5页Materials Reports

摘　　要：为了既实现单晶铜的有效连接,又尽量不损失单晶高纯铜的导电性能,采用冷压焊对单晶铜进行连接,研究了压缩量对接头组织性能的影响规律。结果表明,在单晶铜冷压焊连接过程中,当压缩量较小时,不能形成有效的连接接头。当压缩量达到一定值,便能形成有效的连接接头,沿接头轴向方向的母材区和变形区仍保持单晶结构,但取向发生了改变。随着变形量的增加,接头的连接界面处单晶组织结构破坏,接头处细小的再结晶晶粒数量先增加后减少,由大量取向各异的细小晶粒以及形变带结构组成。连接界面处的晶粒尺寸逐渐减小,接头的抗拉强度先增加后略有减小,接头的导电性良好。Single crystal copper was connected using cold pressure welding and the influence of compression on the joint microstructure and properties were studied in order to achieve effective connection and not lose the conductivity of single crystal high purity copper as possible.The results showed that an effective joint could not be formed during the cold pressure welding joint connection of single crystal copper when the compression was small.Only when the amount of compression reached a critical value,an effective joint could be formed.In the axial direction of joint,the base material region and the deformation region still maintained a single crystal structure,but their grain orientations changed.With the increase of deformation,the single crystal structure at the joint interface was destroyed and the fine recrystallized grains at the joint increased and then decreased.It consisted of a large number of fine grains with different orientations and a deformation band structure.The grain size at the interface was gradually reduced,and the tensile strength of joint was increased and then slightly decreased.The cold pressure welding joints kept good electrical conductivity.

关 键 词：单晶铜 冷压焊 再结晶 导电性能 抗拉强度 

分 类 号：TG453.4[金属学及工艺—焊接]