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采用Al箔作中间层在1200℃/2 h条件下通过反应扩散连接成功实现了高铌TiAl合金(TAN)的焊接,深入研究了接头的界面微观组织结构和连接机理。结果表明:连接过程中Al箔熔化成液相后与高铌TiAl反应在接头中形成了连续的TiAl3化合物层;在高温扩散作用下,TiAl3化合物逐渐转变为γ-TiAl相;最后经焊后热处理形成了γ+α2层片组织。另外,当直接采用高铌TiAl合金的热处理工艺进行焊接时,亦可以获得具有层片组织的接头。
Welding of high niobium TiAl alloy (TAN) was successfully achieved by reactive diffusion bonding using Al foil as an intermediate layer at 1200 ℃ / 2 h. The interfacial microstructure and bonding mechanism of the joint were investigated. The results show that the AlAl foil melts into the liquid phase and forms a continuous TiAl3 compound layer in the joint after reacting with the high niobium TiAl. During the high temperature diffusion, the TiAl3 compound gradually changes into the γ-TiAl phase. Finally, The formation of γ + α2 ply tissue. In addition, when directly using high-niobium TiAl alloy heat treatment process for welding, but also can be obtained with lamellar joints.