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对镁铝异种金属进行扩散焊接,分别研究了直接焊接和加Zn中间层焊接。通过SEM、EDS、XRD和万能试验机对焊接接头进行结构和性能表征。结果表明,Mg-Al直接焊接时主要生成了Al3Mg2和Al12Mg17金属间化合物相,接头剪切强度随保温时间增加先增加后减小,焊接温度440℃、保温时间100 min时,Mg-Al焊接接头剪切强度达到26.1 MPa。Mg-Zn-Al焊接接头避免了Mg-Al系金属间化合物的生成,界面主要由Mg-Zn共晶层、MgZn化合物层和Al-Zn固溶层组成,接头剪切强度达到38.5 MPa。
Diffusion welding of magnesium and aluminum dissimilar metals were carried out. The direct welding and plus Zn intermediate welding were studied. The structure and performance of welded joints were characterized by SEM, EDS, XRD and universal testing machine. The results show that the intermetallic compound phases of Al3Mg2 and Al12Mg17 are mainly formed during the direct welding of Mg-Al. The shear strength increases first and then decreases with the increase of holding time. When the welding temperature is 440 ℃ and the holding time is 100 min, Shear strength reached 26.1 MPa. The formation of Mg-Al-based intermetallic compounds was avoided by Mg-Zn-Al solder joints. The interface mainly consisted of Mg-Zn eutectic layer, MgZn layer and Al-Zn solid solution layer. The joint shear strength reached 38.5 MPa.