北京航空航天大学学报 ›› 2013, Vol. 39 ›› Issue (4): 549-552,558.

• 论文 • 上一篇    下一篇

热处理对粉末冶金TiAl双态组织与性能的影响

苏美科1, 郑立静1, 张虎1, 郎泽保2   

  1. 1. 北京航空航天大学 材料科学与工程学院, 北京 100191;
    2. 航天材料及工艺研究所, 北京 100076
  • 收稿日期:2012-04-28 出版日期:2013-04-30 发布日期:2013-05-03

Effect of heat treatment on duplex microstructure and mechanical properties of PM TiAl alloy

Su Meike1, Zheng Lijing1, Zhang Hu1, Lang Zebao2   

  1. 1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
    2. Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
  • Received:2012-04-28 Online:2013-04-30 Published:2013-05-03

摘要: 对粉末冶金制备的Ti-46Al-2Cr-2Nb-(B,W)(at%)合金在1 280 ℃进行直接热处理,通过3种不同冷却速度获得了不同的双态组织.当冷却速度为50℃/min时,组织中的α晶粒通过析出γ片形成片层团,获得主要由片层团和γ相组成的双态组织,组织中过高片层体积分数导致拉伸延长率不高;而冷却速度为10℃/min 和5℃/min时,形成了主要由α2晶粒和γ相组成的双相组织,α2晶粒的存在进一步降低了材料室温延长率.

Abstract: Ti-46Al-2Cr-2Nb-(B,W)(at%) alloy prepared by powder metallurgy was direct heat treated and microstructures of the alloy were obtained by cooling at different cooling rates. Results show that duplex microstructure consisting mainly of fine equiaxed γ grains and lamellar colonies were obtained at cooling rate of 50℃/min. High volume fractions of lamellar colonies result in low elongation. Structure consisting mainly of fine γ grains and α2 grains were formed at cooling rate of 10℃/min and 5℃/min. Presence of α2 phase further reduced the elongation.

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