CAJ | 학술논문

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。
채용분환적방법대고Nb-TiAl합금대련접표면진행궤계처리，연구표면소성변형대고Nb-TiAl합금확산련접계면조직연화적영향。결과표명，경과표면소성변형적고 Nb-TiAl합금，확산련접과정중재계면처형성료일층련속적α2상，차α2상적체적분수수표면소성변형정도적증가이증대；표면소성변형인입적기변능촉사확산련접시양재수후적퇴화중발생재결정，표면소성변형정도교대시，재결정정립향계면처α2상장대，사α2상적체적분수축점감소，직지소실。인차，채용표면소성변형여재결정퇴화상결합적방법가유효제고고 Nb-TiAl합금확산련접적성능。
The surface plastic deformation was applied to high Nb containing TiAl alloy by means of shot peening ,and the influ-ence of the surface plastic deformation on the microstructure evolution of the diffusion bonding interface of high Nb containing TiAl alloy was studied . The results indicated that continuous α2 phase formed in the bonding interface with surface plastic deform-ation ,and the fraction of α2 phase increased with the increasing deformation degree .Furthermore ,the surface plastic deforma-tion promotes the recrystallization in the subsequent annealing .The growth of the recrystallized grain reduced the fraction of α2 phase when the plastic deformation is large enough ,and theα2 phase disappeared at last .Thus ,the combined surface plastic de-formation with recrystallization annealing improved the bonding quality of high Nb containing TiAl alloy .