预镀层钛合金与铝合金电弧熔钎焊接头界面组织及力学性能分析  

Microstructure and mechanical properties of TIG weldedbrazed joint of pre-coating titanium and aluminum alloy

作　　者：崔庆龙[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所超精密光学工程研究中心,长春130033

出　　处：《焊接学报》2016年第10期125-128,136,共4页Transactions of The China Welding Institution

摘　　要：钛合金板坡口位置预先热浸镀纯铝镀层,采用TIG电弧熔钎焊的方法连接镀层钛合金与铝合金,对比分析了有镀层和无镀层条件下形成的接头界面组织及焊缝强度.结果表明,两种条件下界面处生成相同成分的金属间化合物Ti Al3,其中无镀层条件下Ti/Al界面反应层呈锯齿状,厚度4-6μm,焊缝平均拉伸强度118 MPa,以脆性断裂为主;镀层条件下界面生成均匀稳定金属间化合物,厚度2μm以下,焊缝平均拉伸强度205 MPa,以韧性断裂为主.镀层的引入减薄了金属间化合物反应层厚度,从根本上改变了接头的断裂的方式.The titanium alloy plate was hot-dipped pure aluminum coating by the position of groove,then the pre-coating titanium alloy was joined to aluminum alloy by TIG welding-brazing. Comparison was made between the uncoated and coated joint to analyze interfacial structure and the strength of weld seam. The test results showed that,the same component TiAl_3 formed under two kinds of interface conditions. There is a interface reaction layer with the thickness of 4 ~ 6 μm in the noncoating joint,and the average tensile strength of the joint is 11 8MPa,brittle fracture is the main fracture mode in tensile test.And the pre-coating joint has the interface reaction layer with the thickness of 2 μm,the average tensile strength of the joint is 205 MPa,and the fracture mode is ductile fracture. The introduction of coating can make the intermetallic compound layer thinner and the fracture mode be changed.

关 键 词：热浸镀 Ti/Al异种金属 电弧熔钎焊 断裂机制 

分 类 号：TG444.74[金属学及工艺—焊接]