Effect of brazing temperature on microstructure and tensile strength ofγ-TiAl joint vacuum brazed with micro-nano Ti−Cu−Ni−Nb−Al−Hf filler

作     者：Li LI Yu-tong CHEN Lei-xin YUAN Fen LUO Zhi-xue FENG Xiao-qiang LI 李力;陈昱橦;袁雷昕;罗芬;冯志雪;李小强

作者机构：School of Materials Science and EngineeringEast China Jiaotong UniversityNanchang 330013China State Key Laboratory of Performance Monitoring and Protecting of Rail Transit InfrastructureEast China Jiaotong UniversityNanchang 330013China National Engineering Research Center of Near-net-shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2024年第34卷第8期

页      面：2563-2574页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the National Natural Science Foundation of China(No.51865012) the Natural Science Foundation of Jiangxi Province,China(No.20202BABL204040) the Open Foundation of National Engineering Research Center of Near-net-shape Forming for Metallic Materials,China(No.2016005) the Science Foundation of Educational Department of Jiangxi Province,China(No.GJJ170372) the GF Basic Scientific Research Project,China(No.JCKY2020205C002) the Civil Population Supporting Planning and Development Project,China(No.JPPT125GH038) 

主　　题：γ-TiAl alloy micro-nano filler vacuum brazing interfacial microstructure tensile strength 

摘      要：A novel micro-nano Ti−10Cu−10Ni−8Al−8Nb−4Zr−1.5Hf filler was used to vacuum braze Ti−47Al−2Nb−2Cr−0.15B alloy at 1160−1220°C for 30 *** interfacial microstructure and formation mechanism of TiAl joints and the relationships among brazing temperature,interfacial microstructure and joint strength were emphatically *** show that the TiAl joints brazed at 1160 and 1180°C possess three interfacial layers and mainly consist ofα2-Ti3Al,τ3-Al3NiTi2 and Ti2Ni,but the brazing seams are no longer layered and Ti2Ni is completely replaced by the uniformly distributedτ3-Al3NiTi2 at 1200 and 1220°C due to the destruction ofα2-Ti3Al barrier *** transformation at 1200°C obviously improves the tensile strength of the joint and obtains a maximum of 343 ***,the outward diffusion of Al atoms from the dissolution of TiAl substrate dominates the microstructure evolution and tensile strength of the TiAl joint at different brazing temperatures.