摘要
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。
The diffusion welding of dissimilar metal magnesium alloy and aluminum alloy was carried out by directwelding and zinc layer. The structure and properties of the welded joint were studied by SEM, EDS, XRD and universaltesting machine. The results show that A13Mg2 and Al12Mg17 intermetallic phase appears when Mg-A1 is directly welded. Theshear strength of Mg-A1 joint increases first and then decreases with increasing holding time. At the welding temperature of440 ℃, holding time of 100 rain, the shear strength of Mg-AI welded joint is 26.1 MPa. The welded joint of Mg-zinc-A1avoids the formation of Mg-A1 intermetallic compound, the interface is mainly composed of Mg - zinc euteetic layer, MgZncompound layer and AI - zinc solution layer. Then, the shear strength of the samples is 38.5 MPa.
出处
《热加工工艺》
CSCD
北大核心
2014年第17期223-225,共3页
Hot Working Technology
