(中国船舶重工集团公司 第七二五研究所，洛阳 471039)
摘 要: 在不施加中间层的情况下，采用不同工艺参数对TC4钛合金进行真空扩散焊连接。利用光学显微镜分析接头的显微组织结构，利用拉伸试验检测接头力学性能，研究工艺参数对显微组织结构和接头力学性能的影响。结果表明：采用适当的工艺参数可以实现TC4钛合金的真空扩散连接。连接过程中，扩散焊界面经历了紧密接触、塑性变形、元素扩散与反应以及体积扩散微孔消除的过程，焊后形成无明显界面的扩散连接接头，接头的最大室温拉伸强度为958 MPa。
关键字: 钛合金；真空扩散焊；显微组织；力学性能；工艺参数
（Luoyang Ship Material Research Institute, Luoyang 471039, China）
Abstract:TC4 titanium alloy was joined by vacuum diffusion bonding without any middle layers at different parameters. The microstructures of the diffusion bonding joints were investigated by optical microscopy (OM). The mechanical properties of the diffusion bonding joints were measured by mechanical testing machine. The effect of processing parameters on the microstructures and mechanical properties were investigated. The results show that TC4 titanium alloy is joined by vacuum diffusion bonding using appropriate bonding temperature and holding time. The diffusion bonding process can be divided into four stages. The maximum tensile strength of the diffusion bonding joints at room temperature is 958 MPa.
Key words: titanium alloy; diffusion bonding; microstructures; mechanical property; processing parameter
