镁-铝超声辅助瞬态液相扩散连接机理研究  

Mechanism of Mg-Al Ultrasonic-Assisted Transient Liquid Phase Bonding

作　　者：李卓霖[1,2] 符军红 王健 卫首敬[1,2] 宋晓国 卞红 LI Zhuolin;FU Junhong;WANG Jian;WEI Shoujing;SONG Xiaoguo;BIAN Hong(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology(Weihai),Weihai 264209,China)

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(威海)山东省特种焊接技术重点实验室,威海264209

出　　处：《航空制造技术》2022年第21期104-111,共8页Aeronautical Manufacturing Technology

摘　　要：镁–铝复合散热结构件在航空工业领域具有较好的应用前景。针对镁–铝异种材料连接中极易产生脆性Al_(12)Mg_(17)、Al_(3)Mg_(2)金属间化合物的关键问题,本试验采用超声辅助瞬态液相连接工艺(Ultrasonic-assisted transient liquid phase bonding,U-TLP Bonding),以纯Zn作为中间层,在350℃下实现了Mg/Zn/Al接头的可靠连接;研究了超声作用时间对接头微观组织演变和力学性能的影响,在最优工艺参数下,接头中主要为Mg+MgZn共析组织,接头平均抗剪强度达到50.2 MPa。The Mg–Al composite heat dissipation structure has a good application prospect in the aviation industry.In view of the key problem that brittle Al_(12)M_(17),Al_(3)Mg_(2)compounds are easily generated in the connection of Mg–Al dissimilar materials,this experiment adopts the ultrasonic-assisted transient liquid phase bonding(U-TLP Bonding),and uses pure Zn as the interlayer,the reliable connection of Mg/Zn/Al joint is realized at 350℃.The effect of ultrasonic time on the microstructure evolution and mechanical properties of the joint is studied.Under the optimal process parameters,the joint is mainly composed of Mg+MgZn eutectoid structure,and the average shear strength of the joint reaches 50.2 MPa.

关 键 词：超声 瞬态液相连接(TLP) 微观组织 力学性能 冶金机理 

分 类 号：TG453.9[金属学及工艺—焊接]