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为抑制钛/不锈钢脉冲加压扩散连接接头界面产物的过度生长,降低界面脆性相对接头性能的不利影响,选用Ni做中间层对Ti和不锈钢进行扩散连接实验。利用扫描电镜、能谱分析、万能拉伸试验和XRD对脉冲加压扩散连接钛/镍/不锈钢接头显微组织和力学性能进行研究。结果表明:在钛/镍界面生成了Ti2Ni、Ti Ni和Ti Ni3金属间化合物层,在镍/不锈钢界面生成了Ni-Fe固溶体;当连接时间为90 s时,接头强度达到最大值,为360 MPa;在拉伸载荷下,接头沿钛/镍界面Ti2Ni和Ti Ni层发生断裂;接头断口形貌为大量的解理条纹,说明接头呈脆性。
In order to suppress the overgrowth of the interface products of the interface of titanium / stainless steel impulse pressurized diffusion joints and reduce the adverse effect of interface brittleness on joint performance, diffusion bonding experiments of Ti and stainless steel were made by using Ni as interlayer. The microstructure and mechanical properties of Ti / Ni / stainless steel joints by pulsed pressure diffusion bonding were investigated by scanning electron microscopy, energy dispersive spectroscopy, universal tensile test and XRD. The results show that Ti2Ni, TiNi and TiNi3 intermetallic compound layers are formed on the Ti / Ni interface and Ni-Fe solid solution forms on the Ni / stainless steel interface. When the bonding time is 90 s, the joint strength reaches the maximum value of 360 MPa; under tensile load, the joints ruptured along Ti2Ni and Ti Ni layers at the Ti / Ni interface; the fracture morphology of the joints was a large number of cleavage stripes, indicating that the joints were brittle.