Zn-xAl中间层对镁/钢接头组织和性能的影响  

Effect of Zn-x Al Interlayer on Microstructure and Mechanical Properties of Mg/Steel Joint

作　　者：赵丽敏[1] 张琳琳 ZHAO Limin ZHANG Linlin(School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China)

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2017年第5期79-84,共6页Journal of Dalian Jiaotong University

基　　金：国家自然科学基金资助项目(51104027);博士学科点专项科研基金资助项目(20112124120004)

摘　　要：通过添加不同Al含量的Zn-x Al(x=0,3,5,8,15)中间层,进行镁与钢的接触反应钎焊.采用扫描电镜、X射线衍射仪、电子万能拉伸试验机等测试手段,对比分析AZ31/Zn-x Al/DC01接头的组织特征及力学性能.结果表明,Al元素的添加使中间层中生成Fe2Al5化合物过渡层,有效阻止了Fe-Zn金属间化合物的形成.接头断裂位置由Fe-Zn金属间化合物层变为Mg-Zn金属间化合物区.随着Al含量的增加,接头剪切强度呈现先增大后减小的趋势.当Al含量为5wt.%时,接头剪切强度最高.The joint of magnesium and steel was realized by contact reaction brazing with Zn-xA1 interlayer containing different A1 contents. The structure characteristics and mechanical properties of the AZ31/Zn-xAl/ DC01 joints were comparatively analyzed by scanning electron microscopy, X-ray diffractionn and electronic u- niversal testing machine. It is found that adding A1 element can effectively prevent the formation of Fe-Zn inter- metallic compounds in the interlayer, where Fez A15 compound transition layer is produced. The weak position of the joint is Mg-Zn intermetallic compound zone instead of Fe-Zn intermetallic compound layer. Al content has an important influence on the joint shear strength. When A1 content is 5wt. %, the joint shear strength is the highest. The fracture of the joint occurs in the composite structure zone, where soft Al-rich phase particles are dispersed in MgZn2 intermetallic compounds.

关 键 词：中间层 镁/钢异种金属 弥散强化 

分 类 号：TG407[金属学及工艺—焊接]