采用Ti-Zr-Cu-Ni真空钎焊Ti_3Al/Ti_3Al和Ti_3Al/GH536接头组织及性能

Microstructures and Properties of Ti_3Al/Ti_3Al and Ti_3Al/GH536 Joints Using Ti-Zr-Cu-Ni Brazing Filler

采用Ti-Zr-Cu-Ni在960℃/1min、960℃/10min和960℃/60min三种规范下真空钎焊Ti3Al/Ti3Al,在960℃/5min和960℃/20min两种规范下真空钎焊Ti3Al/GH536。实验结果表明,随着保温时间的延长,Ti3Al/Ti3Al接头宽度逐渐增加,且剪切强度呈现递增趋势,递增幅度在10MPa左右,接头主要由Ti3Al,NiTi2,CuTi3等化合物相组成,其中NiTi2,CuTi3等脆性化合物的分布对接头性能影响较大;在Ti3Al/GH536接头中由于Fe-Ti,Ni-Ti等脆性化合物分布相对较多,导致出现纵向裂纹,960℃/5min规范下的平均剪切强度为86.4MPa。

Vacuum brazing of Ti3Al/Ti3Al and Ti3Al/GH536 joints using Ti-Zr-Cu-Ni brazing filler was carried out at 960℃ for 1min,10min and 60min and at 960℃ for 5min and 20min respectively.The results showed that the shear strengths were increased as holding time prolonged and the incremental value was about 10MPa for Ti3Al/Ti3Al joints.Ti3Al,NiTi2,CuTi3 phases formed in the brazing seams and the distribution of NiTi2 and CuTi3 brittle phases affected the mechanical properties of the joints.A large number of Fe-Ti,Ni-Ti brittle phases led to lots of longitudinal cracks in Ti3Al/GH536 joints and the average value of shear strength was 86.4MPa.