超声在MB8/Cu/2024异种金属连接过程中的作用机制  

Effect of ultrasound in the bonding process of MB8/Cu/2024 dissimilar alloys

作　　者：李一楠 袁晓萱 石丁文 彭子龙 LI Yinan;YUAN Xiaoxuan;SHI Dingwen;PENG Zilong(School of Mechanical&Automotive Engineering,Qingdao University of Technology,Qingdao,266520,China)

机构地区：[1]青岛理工大学,机械与汽车工程学院,青岛266520

出　　处：《焊接学报》2025年第1期69-79,共11页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51871128,51875300);陕西省教育厅科研服务地方专项(17JF022);山东省自然科学基金资助项目(ZR2023ME194);青岛市自然科学基金资助项目(24-4-4-zrjj-171-jch)。

摘　　要：文中采用超声波辅助瞬间液相扩散(ultrasonic-assisted transient liquid phase,U-TLP)连接实现了大气环境下MB8/Cu/2024异种金属的快速可靠连接.连接过程分为3个阶段,固/固界面阶段—声致氧化膜去除及金属颗粒剥离、固/液转化阶段—固态界面摩擦产热致反应液相出现和液/液界面反应阶段—声致液态加速界面反应.研究表明,在固/固界面阶段,纵向超声促使MB8/Cu界面和2024/Cu界面上产生x方向和y方向相对位移,在剪切应力的作用下,摩擦导致Al颗粒、Cu颗粒剥落,氧化膜部分去除;在固/液转化阶段,超声促使2024/Cu界面摩擦产生温升,在达到共晶反应温度后开始出现Al_(2)Cu+α-Al液相;在液/液界面反应阶段,超声空化与声流效应使得MB8/Cu界面、2024/Cu界面产生z方向位移场与声压场,加速Al_(2)Cu+α-Al和Mg2Cu+α-Mg共晶生成,完成连接.MB8/2024异种金属接头抗剪强度最高为64 MPa.Ultrasonic-assisted transient liquid phase(U-TLP)bonding was used to realize the fast and reliable bonding of MB8/Cu/2024 dissimilar alloys in air.The joining process was divided into three stages,solid/solid interface stage-acoustic-induced stripping of metal particles and removal of oxide films,solid/liquid transformation stage-frictional heat generation of solid interface led to appearance of reactive liquid phases and liquid/liquid interface reaction stage-ultrasonic accelerated interfacial reaction in liquid.The results showed that in the solid/solid interface stage,the longitudinal ultrasound can cause relative displacement in the x-direction and y-direction on the interfaces of MB8/Cu and 2024/Cu.And under the influence of shear stress,This displacement could lead to interfacial friction,resulting in the removal of Al and Cu particles and partial removal of the oxide film.in the solid/liquid transformation stage,2024/Cu interface produced a temperature rise due to friction under the action of ultrasound,and Al_(2)Cu+α-Al liquid phase began to appear after the eutectic reaction temperature was reached;In the liquid/liquid interface reaction stage,cavitation and acoustic streaming effects made MB8/Cu and 2024/Cu interfaces generate z-direction displacement field and acoustic pressure field,accelerating generation of Al_(2)Cu+α-Al and Mg2Cu+α-Mg eutectic phases to form joining.the maximum shear strength of the MB8/2024 dissimilar metal joints was 64 MPa.

关 键 词：超声波辅助瞬间液相扩散连接 镁/铝异种金属 连接机制 声致去膜 界面摩擦产热 

分 类 号：TG454[金属学及工艺—焊接]