论文部分内容阅读
采用喷丸的方法对高Nb-TiAl合金待连接表面进行机械处理,研究表面塑性变形对高Nb-TiAl合金扩散连接界面组织演化的影响。结果表明,经过表面塑性变形的高Nb-TiAl合金,扩散连接过程中在界面处形成了一层连续的α2相,且α2相的体积分数随表面塑性变形程度的增加而增大;表面塑性变形引入的畸变能促使扩散连接试样在随后的退火中发生再结晶,表面塑性变形程度较大时,再结晶晶粒向界面处α2相长大,使α2相的体积分数逐渐减少,直至消失。因此,采用表面塑性变形与再结晶退火相结合的方法可有效提高高Nb-TiAl合金扩散连接的性能。
The surface of the high Nb-TiAl alloy to be joined was mechanically treated by shot peening to study the effect of surface plastic deformation on the microstructure evolution of the diffusion-bonded interface of the high Nb-TiAl alloy. The results show that a continuous layer of α2 phase is formed at the interface of the high Nb-TiAl alloy after plastic deformation, and the volume fraction of α2 phase increases with the increase of surface plastic deformation. The plastic deformation of the surface The introduced distortion can promote the recrystallization of the diffusion bonded samples during the subsequent annealing. When the degree of plastic deformation is large, the recrystallized grains grow up towards the α2 phase at the interface, and the volume fraction of the α2 phase decreases until it disappears. Therefore, the combination of surface plastic deformation and recrystallization annealing method can effectively improve the high Nb-TiAl alloy diffusion bonding performance.