超声作用时间对超声辅助瞬间液相扩散连接MB8/Ni/LY12异种金属接头形成的影响  

Effect of Ultrasonic Treatment Time on Formation of MB8/Ni/LY12 Dissimilar Alloy Joints by Ultrasound-assisted Transient Liquid Phase Bonding

作　　者：杨乘飞 李一楠 崔壮[1,2] 吴志远 彭子龙 YANG Chengfei;LI Yinan;CUI Zhuang;WU Zhiyuan;PENG Zilong(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;Key Laboratory of Industrial Fluid Energy Conservation and Pollution Control,Ministry of Education,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,山东青岛266520 [2]青岛理工大学工业流体节能与污染控制教育部重点实验室,山东青岛266520

出　　处：《热加工工艺》2021年第9期65-68,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51871128,51875300);山东省自然科学基金项目(ZR2017MEE012,ZR2018MEE017);山东省重点研发计划项目(2018GGX103036)。

摘　　要：采用纯镍中间层对镁/铝异种合金进行超声辅助瞬间液相扩散焊(U-TLP),实现大气环境下无钎剂快速有效连接。结果表明:在520℃时,超声10 s,Mg母材首先与Ni箔发生共晶反应,生成Mg_(2)Ni+α-Mg共晶液相,Al侧存在破碎的母材和中间层颗粒,无明显反应物。随着超声作用时间延长至15 s时,Al母材与Ni发生扩散连接生成Al_(3)Ni层。在超声30 s时,Ni箔消失,接头内产生大量Al_(3)Mg_(2)、Al_(12)Mg_(17),其严重影响了接头的连接,剪切强度仅为20.2 MPa。当超声时间为15 s时,剪切强度达到最大值31.2 MPa,断裂位置是接头中Al侧Al_(3)Ni层。Ultrasound-assisted transient liquid phase bonding(U-TLP)of magnesium/aluminum alloy was carried out with a pure nickel interlayer to achieve rapid and effective bonding without flux in air.The results show that Mg base metal firstly reacts with Ni foil to form Mg_(2)Ni+α-Mg eutectic liquid phase at 520℃for 10 s with the assistance of ultrasound,and there are broken Al base metal and interlayer particles on the Al side.When ultrasonic treatment time is 15 s,the Ni and Al elements diffuse into each other to form the Al_(3)Ni interlayer.When the ultrasonic treatment time is 30 s,the Ni foil disappears and a large amount of Al_(3)Mg_(2)and Al_(12)Mg_(17)form in the joint,which seriously affects the connection of joint,and the shear strength is only 20.2 MPa.When the ultrasonic time is 15 s,the shear strength reaches the maximum value of 31.2 MPa,the fracture position is located at the Al_(3)Ni layer at Al side.

关 键 词：镁合金 铝合金 超声辅助 瞬间液相扩散连接 微观组织 

分 类 号：TG456.9[金属学及工艺—焊接]