反应扩散连接高铌TiAl合金(英文)  

Reaction-Diffusion Bonding of High Nb Containing TiAl Alloy

作　　者：宋晓国[1,2] 曹健[2] 刘甲坤[2] 赵立岩[1,2] 冯吉才[1,2] 

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

出　　处：《稀有金属材料与工程》2014年第1期28-31,共4页Rare Metal Materials and Engineering

基　　金：National Basic Research Program of China(2011CB605505);Research Fund of Harbin Institute of Technology at Weihai(HIT(WH)201208)

摘　　要：采用Al箔作中间层在1200℃/2 h条件下通过反应扩散连接成功实现了高铌TiAl合金(TAN)的焊接,深入研究了接头的界面微观组织结构和连接机理。结果表明:连接过程中Al箔熔化成液相后与高铌TiAl反应在接头中形成了连续的TiAl3化合物层;在高温扩散作用下,TiAl3化合物逐渐转变为γ-TiAl相;最后经焊后热处理形成了γ+α2层片组织。另外,当直接采用高铌TiAl合金的热处理工艺进行焊接时,亦可以获得具有层片组织的接头。In this study, high Nb containing TiAI alloy （TAN） was welded by reaction-diffusion bonding using Al foil as interlayer at 1200 ℃ for 2 h. The desired full lamellar microstructure （y＋a2） was obtained across the bonding seam when the joint was heat-treated according to the heat treatment process of TAN alloy. The present paper also investigated microstructure and bonding mechanism in details. The results show that liquid Al can react with TAN to form TiAl3 intermetallic layer, and then the TiAl3 layer will transform to y-TiAl by solid-state diffusion at high temperature, finally a full lamellar structure is formed after heat treatment. Furthermore, sound joints with full lamellar structure can be also obtained when TAN alloy is directly bonded in accordance with the heat treatment cycle of TAN alloy.

关 键 词：金属间化合物合金 连接 扩散 界面组织 

分 类 号：TG453.9[金属学及工艺—焊接]