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采用真空扩散连接,实现了TC4-Inconel 625异种材料的连接。采用扫描电镜和电子万能拉伸试验机对接头界面微观组织和力学性能进行了研究。结果表明,当连接时间为3 min时,在连接界面生成了α+βTi片层组织,β-Ti、Ti2Ni、Ti Ni和Ti Ni3等反应产物,接头抗拉强度达到580 MPa。当连接时间增加到5 min时,在连接界面产生了相同的多层反应产物,但反应层的厚度大大增加,从3 min时的约3μm增加到约6μm,接头抗拉强度降低至440 MPa。在3和5 min连接时间下接头断口上观察到大量的解理条纹,说明接头呈脆性断裂。
Using a vacuum diffusion connection, TC4-Inconel 625 dissimilar materials are connected. The microstructure and mechanical properties of the interface of the joint were studied by scanning electron microscopy and electronic universal tensile testing machine. The results show that the reaction products of α + βTi sheet, β-Ti, Ti2Ni, TiNi and TiNi3 were formed at the interface when the bonding time was 3 min. The tensile strength of the joint reached 580 MPa. When the connection time increased to 5 min, the same multilayer reaction product was produced at the interface, but the thickness of the reaction layer increased greatly from about 3 μm to about 6 μm at 3 min, and the tensile strength of the joint decreased to 440 MPa. A large number of cleavage fringes were observed on the fracture of the joint at 3 and 5 min connection, indicating a brittle fracture of the joint.