γ-TiAl合金层状组织的转变动力学和粗化行为

金属学报, 1994, 30(3): 117-123.

γ-TiAl合金层状组织的转变动力学和粗化行为

北京航空航天大学

关键词： γ－ＴｉＡｌ合金 , lamellar structure , kinetics , discontinuous coarsening

TRANSFORMATION KINETICS AND COARSENING OF LAMELLAR STRUCTURE IN γ-TiAl ALLOY

TIAN Huahang , HUANG Zheng , CHEN Changqi(Beijing University of Aeronautics and Astronautics) , LIN Jianguo(University of Xiang tan)(Manuscript received 5 April

Keywords： :γ-TiAl alloy , 层状组织 , 动力学 , 不连续粗化

研究了Ｔｉ－４７．８ａｔ．－％Ａｌ合金从α相区冷至室温再在双相区时效后，层状组织的转变机理及不连续粗化．层状组织转变过程与时效温度和形成过饱和α＿２单相时的冷却速度有关．建立了层状组织转变的动力学模型．层状组织的稳定性随片间距减小而降低，表现为时效时发生不连续粗化．

Transformation mechanism and discontinuous coarsening of lamellar structure were studied by cooling Ti-47.8at.-%Al alloy fromα region to room temperature and then aging in the two phase region.The lamellar transformation process relates to aging temperature and cooling rate,at which α_2 single phase forms. A model of lamellar transformation kinetics was developed.The stability of lamellae decreases with decreasing interlamellar spacing and discontinuous coarsening occurres during aging.Correspondent:TIAN Huahang,assistant,Laboratory No.8,Department No.1,Beijing University of Aeronautics and Astronautics,Beijing 100083

参考文献

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