Super-Ni叠层复合材料与钛合金过渡液相扩散焊界面组织特征  

Interfacial microstructure of transient liquid phase diffusion bonding joint of Super-Ni laminated composites to titanium alloy

作　　者：刘坤[1] 李亚江[1] 王娟[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061

出　　处：《焊接学报》2018年第6期57-60,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51575316);山东省自然科学基金资助项目(ZR2015EM040)

摘　　要：以铜箔为中间层,对Super-Ni叠层复合材料与Ti-6Al-4V钛合金进行过渡液相扩散焊.通过扫描电镜(SEM)、能谱分析(EDS)、显微硬度测试对接头的界面组织及性能进行分析.结果表明,铜箔中间层阻止了钛与镍的扩散接触,防止了Ti-Ni脆性金属间化合物的生成.扩散焊接头由Super-Ni侧扩散层、中间反应层、钛侧扩散层三个特征界面层组成.界面处Ni,Al原子扩散缓慢,Cu,Ti原子充分扩散反应,在中间反应层与钛侧扩散层之间形成由TiCu相组成的锯齿状界面,在钛侧扩散层生成细小的Ti_2Cu相,接头过渡区显微硬度最高达600 HV0.5.Cu foil was used as interlayer during transient liquid phase diffusion bonding Super-Ni laminated composites to Ti-6 Al-4 V titanium alloy. Interfacial microstructure and property of joint were investigated by scanning electron microscope( SEM),energy dispersive spectrometer( EDS) and microhardness test. Results indicated that the direct contact between titanium and nickel and the formation of brittle intermetallic compound was inhibited by Cu foil. The diffusion bonding joint was composed of three featured layers which were diffusion layer near Super-Ni,middle reaction layer and diffusion layer near titanium alloy. The diffusion of Ni and Al atoms was slow while the diffusion and reaction of Cu and Ti atoms was sufficient. Serrated interface composed of TiC u phase was formed between middle reaction layer and diffusion layer near titanium alloy. Fine microstructure comprised of Ti_2Cu was formed in diffusion layer near titanium alloy. The highest microhardness of joint reached 600 HV0. 02.

关 键 词：叠层复合材料 过渡液相扩散焊 界面组织 显微硬度 

分 类 号：TG401[金属学及工艺—焊接]