北京航空航天大学学报 ›› 2003, Vol. 29 ›› Issue (3): 241-243.

• 论文 • 上一篇    下一篇

连续加热时γ-TiAl激光快凝组织及其性能的变化

吴国清1, 黄正1, 林建国2, 杨金海2   

  1. 1. 北京航空航天大学 材料科学与工程系;
    2. 湘潭大学 物理系
  • 收稿日期:2001-10-10 出版日期:2003-03-31 发布日期:2010-09-27
  • 作者简介:吴国清(1974-),男,山东临沂人,博士生,100083,北京.
  • 基金资助:

    国家自然科学基金资助项目(59971004); 航空基础科学基金资助项目(01H51004)

Structure and Hardness Changes of Laser Melted TiAl AlloySurface During Continuous Heating

Wu Guoqing1, Huang Zheng1, Lin Jianguo2, Yang Jinhai2   

  1. 1. Dept. of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics;
    2. Department of Physics, Xiangtan University
  • Received:2001-10-10 Online:2003-03-31 Published:2010-09-27

摘要: 为认识超塑扩散连接机理,研究了γ-TiAl基合金表层激光快速熔凝组织在连续加热过程中的相转变规律及硬度变化.结果表明,在以10℃/min连续加热时,γ-TiAl激光表面快速熔凝组织在750℃左右发生α2→γ相转变,在860℃左右其组织由枝晶组织转变为细小的等轴晶组织,硬度值也出现了相应变化.上述细晶组织为合金的超塑扩散连接提供了良好的基础.

Abstract: Structural transformation and hardness variation in the laser melted TiAl intermetallic alloy surface during continuous heating were studied systemically. The results indicated that, during continuous heating from 50 to 1000℃ with a heating rate of 10℃/min, α2→γ phase transformation in the laser melted TiAl intermetallic alloy surface takes place at about 750℃, and the dendritic structure is transformed into fine-grained structure at about 860℃, correspondingly, variations in the hardness of the laser melted TiAl intermetallic alloy surface were also measured. The fine grain structure was considered to be a good basis of superplastic/diffusion bonding.

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