TC4钛合金蜂窝板钎焊接头组织性能分析

研究了TC4钛合金蜂窝板的钎焊工艺，试验采用Ti-Zr-Ni-Cu钎料，真空度不低于2×10-3 Pa，钎焊温度为930℃，保温时间为30 min.对焊后试件的钎焊界面组织进行超声无损检测，检测结果表明面板与蜂窝芯钎焊效果极好，未发现有脱焊、虚焊等现象.采用扫描电镜（SEM）和能谱分析（EDS）法进行了试验分析.结果表明，母材和钎料发生相互扩散渗透反应，并出现有新的析出相.该工艺下蜂窝板的界面平均拉脱强度为12.8 MPa，抗剪强度为9.01 MPa，钎焊接头属于脆性断裂.

Microstructure and performance analysis of vacuum brazing welded titanium joints in honeycomb sandwich panel structure

The processing parameter of titanium alloy honeycomb sandwich structure was studied, using filling foil of Ti-Zr-Ni-Cu based metal.The vacuum degree was not lower than 2×10-3 Pa and the brazing temperature was 930 ℃with a holding time of 30 min. The ultrasonic testing(NDT) results showed an excellent brazing weld with no welding-off and faulty welding. The microstructure of the brazed joint was examined by means of scanning electron microscopy(SEM) and energy dispersive spectroscopy (EDS). The results showed that mutual diffusion was happened between the filler metal and the base metals resulting in the precipitation of new phases. Using the optimized parameters, the average tensile strength of joint was 12.8 MPa, the shear strength was 9.01 MPa. The fracture mode of the vacuum brazing joints belonged to a brittle type fracture