铝/钛异种金属填丝电子束熔钎焊接头组织与性能

采用填丝电子束熔钎焊对TA2纯钛和1060纯铝进行了焊接试验，分别对接头显微组织、相组成、抗拉强度和显微硬度进行了分析. 结果表明，采用填丝电子束熔钎焊可以实现纯钛与纯铝的有效连接，接头抗拉强度为98.8 MPa，达到铝母材的96.7%. 接头呈现典型的熔钎焊特征，由钛侧钎焊接头及铝侧熔焊接头组成. 熔钎焊界面存在Ti-Al金属间化合物层，其厚度小于2 μm，未对接头性能强度产生影响. 铝侧熔化区内存在散布的金属间化合物起到一定强化作用，显微硬度最低值位于铝侧热影响区内，拉伸断裂于该区域.

Microstructure and mechanical properties of EBW brazed titanium to aluminum joint using AlSi5 filler wire

Electron beam welding brazing experiments of titanium to aluminum using AlSi5 filler wire were carried out in present paper. Microstructure and mechanical properties of welding joints were examined. The results showed that it was possible to join aluminum to titanium by electron beam welding with filler wire. Tensile strength reached 98.8 MPa, up to 96.7% of that of aluminum. The joint took on a typical welding brazing characteristic, which was composed of brazing joint at titanium side and welding joint at aluminum side. There was a Ti-Al intermetallic layer in the brazing joint with a thickness less than 2 μm, having weak impact on mechanical properties. Aluminum weld can be strengthened by dispersedly distributed IMCs. The lowest hardness value was in the HAZ, where fracture occurred during tensile test.