Zn作中间层的ZK60/5083二次真空扩散焊接头显微组织与力学性能  

Microstructure and Mechanical Property of Two-step Vacuum Diffusion Welded Joint of ZK60/5083 Using Zinc as Interlayer

作　　者：郭雨菲 王宾宾[1] 郭阳阳[2] 潘厚宏[2] GUO Yufei;WANG Binbin;GUO Yangyang;PAN Houhong(Luoyang Ship Material Research Institute,Luoyang 471023,China;School of Material Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《热加工工艺》2018年第17期55-58,共4页Hot Working Technology

摘　　要：采用二次真空扩散焊的方法,以纯Zn箔作为中间层,实现了ZK60镁合金和5083铝合金的连接。采用扫描电镜（SEM）、能谱分析仪（EDS）和X射线衍射仪（XRD）对焊接接头界面显微组织、元素分布和断口特征进行观测和表征,并测试了接头的显微硬度和剪切强度。结果表明,接头界面区由镁锌共晶相MgZn2层、残余锌层、铝基固溶体与锌基固溶体的混合物层和铝基固溶体层组成。由于Mg-Zn金属间化合物的生成及Zn原子扩散进入Al基体中产生强化作用使得焊接接头界面区的显微硬度明显高于两侧,呈现“双峰”趋势,接头的平均剪切强度为22.6 MPa,断裂发生在MgZn2层与残余锌层界面处。The connection of ZK60 magnesium alloy and 5083 aluminum alloy was realized by two-step vacuum diffusion welding and using pure Zn foil as the interlayer. With the help of scanning electron microscopy（SEM）, energy dispersive spectroscopy（EDS） and X-ray diffractometer（XRD）, the interface microstructure, element distribution and fracture characteristics of the welded joint were observed and characterized, and the microhardness and shear strength of the joint were tested as well. The results show that the joint interface area is composed of magnesium zinc eutectic phase Mg Zn2 layer,residual zinc layer, mixture layer of aluminum based solid solution and zinc based solid solution and aluminum based solid solution layer. Due to the formation of Mg-Zn intermetallics and the diffusion of Zn atoms into the Al matrix, the microhardness of the welded joint interface area is significantly higher than that of the two sides, presenting the ＂double peak＂ trend. The average shear strength of the joint is 22.6 MPa. The fracture occurs at the interface between the Mg Zn2 layer and the residual zinc layer.

关 键 词：Zn中间层 扩散焊 镁合金 铝合金 显微组织 

分 类 号：TG453.9[金属学及工艺—焊接]