Vacuum brazing of TC4 titanium alloy and 316L stainless steel was conducted using Ag_70.5Cu_27.5Ti₂ filler metal, the effects of microstructure and mechanical properties of brazing temperature on interface were investigated, and the bonding mechanism of brazed joint was also established. The results show that the filler metal and the base metal on both sides were completely diffused and bonded well. The microstructure of brazed joint interface is as follows: TC4 titanium alloy/diffusion layer(α-Ti + Ti₂Cu)/reaction layer (including TiCu and Ti₂Cu)/joint center area/TiFe layer/316L stainless steel. When the holding time lasted for 15 min, the shear strength of brazed joint first increased and then decreased as the brazing temperature rose. When the brazing temperature upped to 870 °C, the maximum of shear strength reached 190 MPa, and then the fracture occurred in the center of the brazed joint. The hardness of the joints gradually increased as the temperature rose, and the mean value reached maximum of 323 HV at 930 °C.

用Ag _70.5 Cu _27.5 Ti ₂钎料对TC4钛合金和316L不锈钢进行真空钎焊，研究了钎焊温度的微观组织和力学性能对界面的影响，并建立了钎焊接头的结合机理。结果表明，两侧的填充金属和贱金属完全扩散并良好地结合。钎焊接头的显微组织如下：TC4钛合金/扩散层（α-Ti+ Ti ₂ Cu）/反应层（包括TiCu和Ti _2）Cu）/接头中心区域/ TiFe层/ 316L不锈钢。当保持时间持续15分钟时，钎焊接头的剪切强度首先随着钎焊温度的升高而增加，然后降低。当钎焊温度升至870°C时，最大剪切强度达到190 MPa，然后在钎焊接头的中心发生断裂。接头的硬度随着温度的升高而逐渐增加，并且在930°C时平均值达到最大值323 HV。