Spark plasma sintering was used to bond β-γ TiAl alloys containing high content of niobium. The microstructure features and recrystallization of bonding interface were investigated. The results showed that sound joint could be obtained through pulse current diffusion bonding (PCDB) conducted at 1150 °C under the applied pressure of 10 MPa for 20 min. The formation of α₂ phase in the bonding interface can be suppressed at high temperature through PCDB compared with hot pressing diffusion bonding. The dynamic recrystallization mechanism in the bonding interface was discontinuous dynamic recrystallization through PCDB. The highest shear strength was 394.8 MPa at 1150 °C/10 MPa/20 min through PCDB. With bonding temperature increasing, intercrystalline fracture decreased and cleavage fracture increased on the fracture surface.

火花等离子烧结用于结合含铌量高的β-γTiAl合金。研究了键合界面的微观结构特征和重结晶。结果表明，可通过在1150°C的压力下施加10 MPa的脉冲电流扩散结合（PCDB）20分钟来获得良好的接头。α的形成₂与热压扩散键合相比，在高温下通过PCDB可以抑制键合界面中的气相。结合界面中的动态重结晶机制是通过PCDB进行的不连续动态重结晶。通过PCDB在1150°C / 10 MPa / 20 min时的最高剪切强度为394.8 MPa。随着键合温度的升高，晶间断裂减少，而断裂面上的分裂断裂增加。