钎焊温度对TC4/Ti60接头组织及性能的影响  

Effect of brazing temperature on the interfacial microstructure and mechanical properties of TC4/Ti60 brazed joints

作　　者：牛超楠 宋晓国[1,2] 胡胜鹏 付伟 韩林峰[2] 冯吉才 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点试验室,哈尔滨150001 [2]哈尔滨工业大学(威海)山东省特种焊接技术重点试验室,威海264209

出　　处：《焊接学报》2018年第6期77-80,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51405099);国家科技重大专项资助项目(2014ZX04001131);国家国际科技合作专项资助项目(2015DFA50470)

摘　　要：为研究钎焊温度对TC4/Ti60接头组织及力学性能的影响,采用纯铜箔作为中间层对TC4与Ti60合金进行接触反应钎焊,钎焊温度范围为970~1 010℃.采用SEM,EDS,XRD,拉剪试验对接头组织及力学性能进行研究.结果表明,接头的典型界面组织为TC4/α-Ti+Ti_2Cu/Ti_2Cu/Ti Cu/Ti_2Cu/α-Ti+Ti_2Cu/Ti60.随着钎焊温度的升高,基体侧的反应扩散层厚度增加,钎缝厚度及Ti-Cu金属间化合物含量逐渐减少,钎缝成分趋于均匀化.接头抗剪度随钎焊温度的升高先增加后减少,当钎焊工艺为1 000℃保温10 min时,接头抗剪强度最高为130 MPa.断口分析表明,接头断裂于钎缝与扩散反应层之间,断裂方式为准解理断裂.In order to study the effect of brazing temperature on the microstructure and mechanical properties of TC4/Ti60 joints,the contact reactive brazing of TC4 and Ti60 alloys using pure copper foil was performed and the brazing temperature ranged from 970 ℃ to 1 010 ℃. The microstructure and mechanical properties of the brazed joints were investigated by scanning electron microscope( SEM),energy dispersive spectrometer( EDS),X-ray diffraction( XRD) and tension shear test. The results showed that the typical interfacial microstructure of TC4/Cu/Ti60 brazed joint was TC4/α-Ti + Ti_2Cu/Ti_2Cu/TiC u/Ti_2Cu/α-Ti + Ti_2Cu/Ti60. The thickness of reaction diffusion layers near substrates were increased with the increasing of brazing temperature,while the width of brazing seam with Ti-Cu intermetallic compounds were decreased. The composition of brazing seam tend to be uniform. The shear strength of joints first increased and then decreased with increasing the brazing temperature. The highest shear strength of 130 MPa was obtained when brazed at 1 000 ℃ for 10 min. Fracture analysis indicated that the quasi-cleavage fracture occurred between the center of brazing seam and the reaction diffusion layer.

关 键 词：接触反应钎焊 纯铜中间层 钎焊温度 界面组织 力学性能 

分 类 号：TG454[金属学及工艺—焊接]