Ti6Al4V/Cu异种金属激光焊接头组织及性能研究  

Microstructure and properties of Ti6Al4V/Cu dissimilar metals laser welded joints

作　　者：刘欢 高晓龙 刘晶 王小强 李伦坤 Liu Huan;Gao Xiaolong;Liu Jing;Wang Xiaoqiang;Li Lunkun(Baoji University of Arts and Sciences,Baoji 721016,Shaanxi,China;Key Laboratory of Advanced Manufacturing and Detection Technology for Industrial Robot and Its Major Component,Baoji University of Arts and Sciences,Baoji 721016,Shaanxi,China)

机构地区：[1]宝鸡文理学院,陕西宝鸡721016 [2]宝鸡文理学院,陕西省机器人关键零部件先进制造与评估省市共建重点实验室,陕西宝鸡721016

出　　处：《焊接》2019年第10期7-11,I0002,共6页Welding & Joining

基　　金：国家自然科学基金(51705005,51905006);陕西省自然科学基金(2018JQ5204);宝鸡市科研计划项目(2017JH2-10);宝鸡文理学院校级重点项目(ZK16045);宝鸡文理学院研究生创新科研项目(YJSCX19ZD05,YJSCX19ZC10)

摘　　要：为解决Ti/Cu异种金属焊接时形成TixCuy脆性相严重降低接头力学性能的问题,利用激光诱导钎焊反应方法对采用Nb做中间层的Ti6Al4V和Cu材料进行了焊接。将光束置于Ti6Al4V/Nb界面控制热输入使得Nb中间层部分熔化形成焊接接头。结果表明,在Ti6Al4V/Nb界面形成了由(Nb,Ti)固溶体组成的熔化区,依靠未熔化的Nb从熔化区吸取的热量使得Cu熔化从而润湿Nb,在Nb/Cu界面形成了Cu基和Nb基固溶体组成的钎焊连接层。因此,通过一次焊接形成了两个连接界面。Ti6Al4V和Nb被熔化焊连接,而Nb和Cu被钎焊连接,两个区域被未熔化的Nb隔开,从而抑制了TixCuy金属间化合物的形成。接头的抗拉强度达到225MPa,并且呈典型的韧性断裂模式。Laser induced brazing reaction method was used to weld Ti6Al4V and Cu materials with Nb intermediate layer to solve the problem of Ti x Cu y brittle phase formed in Ti/Cu dissimilar metals welding which seriously reduced the mechanical properties of the joint.Laser beam was located at the Ti6Al4V/Nb interface,and heat input was controlled to make the Nb interlayer melt partially.The result showed that the fusion zone at the Ti/Nb interface is composed of(Nb,Ti)solid solution.Relying on the unmelted Nb absorbing heat from the melting zone,Cu was melted to wet Nb,and a brazing joint layer composed of both Cu based and Nb based solid solution formed at the Nb/Cu interface.Thus,a hybid welding joint of two metallurgical welding zones was formed through one welding.Ti6Al4V and Nb were joined by fusion welding,while Nb and Cu were welded by brazing.The two metallurgical regions were separated by the unmelted Nb,which inhibited the formation of Ti x Cu y brittle phase.The tensile strength of the joint was 225 MPa,and it showed a typical ductile fracture mode.

关 键 词：钛/铜异种金属 铌中间层 激光诱导钎焊反应方法 组织及性能 

分 类 号：TG456.7[金属学及工艺—焊接]