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采用Ti-Zr-Ni-Cu非晶钎料箔实现了TZM合金的真空钎焊连接,研究了钎焊温度和保温时间对接头界面微观组织结构及力学性能的影响。通过SEM、EDS分析了接头界面组织及物相成分、确定接头的断裂位置和断裂方式,通过XRD分析确定接头中存在的物相。研究结果表明:接头典型界面组织为TZM/Ti-Mo固溶体+(Ti,Zr)2(Ni,Cu)/TZM,随着钎焊温度或保温时间的增加,钎缝中Ti-Mo固溶体的含量增加,(Ti,Zr)2(Ni,Cu)相含量减少,且Ti-Mo固溶体中Mo元素的原子比例增加,钎缝与母材连接界面处、母材中的裂纹状结构含量增加。随钎焊温度或保温时间的增加,接头剪切强度先增大后减小,当钎焊温度1020℃,保温时间20 min时,接头具有最大剪切强度105 MPa。断口分析表明,断裂位置为钎缝与母材连接界面,断裂方式为解理断裂兼部分沿晶断裂。
The vacuum brazing connection of TZM alloy was achieved by using Ti-Zr-Ni-Cu amorphous filler metal foil. The effects of brazing temperature and holding time on the microstructure and mechanical properties of the joint interface were studied. The microstructure and phase composition of the joint interface were analyzed by SEM and EDS to determine the fracture location and fracture mode of the joint. XRD analysis was used to determine the phase present in the joint. The results show that the TZM / Ti-Mo solid solution (Ti, Zr) 2 (Ni, Cu) / TZM is the typical interface structure of the joint. With the increase of brazing temperature or holding time, the content of Ti-Mo solid solution , The content of (Ti, Zr) 2 (Ni, Cu) phase decreases and the atomic ratio of Mo in Ti-Mo solid solution increases. The content of crack-like structure in base metal increases at the interface between solder joint and base metal. With the increase of brazing temperature or holding time, the shear strength of the joint first increases and then decreases. When the brazing temperature is 1020 ℃ and the holding time is 20 min, the joint has the maximum shear strength of 105 MPa. Fracture analysis shows that the fracture location is the bonding interface between brazing seam and base metal, and the fracture mode is cleavage fracture and some intergranular fracture.