通过对TA17/0Cr18Ni9Ti相变超塑性扩散焊接头拉伸断口的观察分析,研究了其接头的组织结构,断裂机制.分析表明,在焊接过程中,由于钛合金/不锈钢两侧的Ti、Fe、Cr等原子的互扩散,在接头界面处形成了β-Ti、FeTi、 Fe2Ti、σ等物相.由于界面处缺陷的存在以及钛合金侧拉向残余应力的存在,使拉伸断裂主要发生在β-Ti和FeTi中.分析还发现,接头对缺陷很敏感,焊接端面上的倒角、划痕及孔洞会使接头的强度降低.
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