S355钢/6005A铝合金瞬间液相扩散连接接头组织与性能  

Microstructures and mechanical properties of transient liquid phase diffusion bonded S355 steel/6005A aluminum alloy joint

作　　者：谷晓燕[1] 刘亚俊[1] 孙大千[1] 徐锋[1] 孟令山[1] 高帅[1] 

机构地区：[1]吉林大学材料科学与工程学院,长春130022

出　　处：《吉林大学学报（工学版）》2017年第5期1534-1541,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51275204)

摘　　要：采用纯Cu箔作中间层,将S355钢与6005A铝合金异种金属进行了瞬间液相(TLP)扩散连接。运用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)以及万能试验机对接头进行了系统地分析。结果表明:连接条件为580°C和15min时,接头界面出现分层结构;随着保温时间的延长和加热温度的升高,接头界面扩散区宽度逐渐变大,分层现象不明显,但在近钢侧的Fe-Al金属间化合物层会有裂纹出现。近钢侧Fe-Al金属间化合物层的显微硬度可达439HV。当连接条件为580°C和30min时,接头拉剪强度最高,为77 MPa。添加中间层Cu箔,连接初期产生共晶液相润湿钢和铝的表面,连接后期阻碍Fe元素和Al元素之间的互扩散,从而保证了接头的质量。Transient liquid phase diffusion bonding of steel/aluminum alloy dissimilar metal joints was carried out with pure Cu foil as the interlayer.The microstructure and mechanical properties of the joints were analyzed by Scanning Electron Microscope(SEM),Energy Dispersion Spectrometer(EDS),X-ray Diffraction(XRD)and instron testing machine.Results show that,under the bonding condition of 580 ℃ and 15 min,layered structure appears in the joint.With the increase in holding time and bonding temperature,the width of diffusion zone increases,which indicates that sufficient reaction occurs at the interface,and the layered structure can not be observed obviously.However,cracks appear in the Fe-Al intermetallic compound layer near the steel side.The microhardness of the Fe-Al intermetallic compound layer adjacent to the steel side reaches 439 HV.When the holding time and bonding temperature are 30 min and 580℃,the joint shear strength reaches the highest,up to 77 MPa.At the beginning of the joining process,Cu foil added generates eutectic liquid to wet the surface of steel and aluminum alloy and blocks the interdiffusion between Fe and Al elements in the later joining process.Thus the joint quality can be ensured.

关 键 词：材料合成与加工工艺 S355钢 6005A铝合金 瞬间液相扩散连接 Cu中间层 金属间化合物 

分 类 号：TG456.9[金属学及工艺—焊接]