TiAl合金与镍基高温合金的扩散连接  

Diffusion bonding of TiAl to Ni-based superalloy

作　　者：何鹏[1] 李海新[1] 林铁松[1] 黄玉东[2] 刘羽[1] 钱国统 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001 [2]哈尔滨工业大学化工学院,哈尔滨150001 [3]绍兴市天龙锡材有限公司,绍兴312001

出　　处：《焊接学报》2012年第1期17-20,113-114,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50975062;51105107;51021002);黑龙江省自然科学基金资助项目(QC2011C044);中国国家博士后基金资助项目(AUGA4130902510);中央高校基本科研业务费专项资金资助项目(HIT.BRETI.2010006;HIT.NSRIF.2010119;HIT.NSRIF.201135)

摘　　要：采用钛为中间层,对TiAl合金与镍基高温合金(GH99)进了扩散连接.研究了扩散连接接头的界面结构和连接温度对界面结构及连接性能的影响,并对连接界面反应层的形成机制进行探讨.结果表明,GH99/Ti/TiAl的界面结构为:GH99/(Ni,Cr)ss/富Ti-(Ni,Cr)ss/TiNi/Ti2Ni/α-Ti+Ti2Ni/Ti(Al)ss/TiAl+Ti3Al/TiAl;随着连接温度的升高,各反应层厚度增加,接头的抗剪强度先增加后减小;在连接温度1 173 K,连接时间30 min,连接压力20 MPa时,抗剪强度最高为260.7 MPa.Diffusion bonding of TiAl to Ni-based alloy using Ti interlayer was studied.The microstructure of the joint and effect of bonding temperature on microstructure and properties of the joint were investigated,and the mechanism of the formation of reaction layers was also discussed.The experiment results show that the interfacial structure of the GH99/Ti/TiAl joint is GH99/(Ni,Cr)ss/rich Ti-(Ni,Cr)ss/TiNi/Ti2Ni/α-Ti+Ti2Ni/Ti(Al)ss/TiAl+Ti3Al/TiAl.With the bonding temperature increasing,the thickness of reaction layers increases.The shear strength of the joint increases with the bonding temperature,and goes through a maximum at 1173 K/30 min/20 MPa and thereafter falls off.The maximum shear strength is 260.7 MPa.

关 键 词：钛铝合金 镍基高温合金 扩散连接 界面结构 

分 类 号：TG457[金属学及工艺—焊接]