| Microstructural evolution of a PM TiAl alloy during heat treatment in α+γ phase field |
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| 作者姓名： | SU Meike ZHENG Lijing LANG Zebao YAN Jie ZHANG Hu |
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| 作者单位： | [School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China [1] Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China [2], Beijing 100076, China |
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| 基金项目： | supported by the National Natural Science Foundation of China (No. 51101003) |
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| 摘 要： | In this study,the effect of temperatures and cooling rates of heat treatment on the microstructure of a powder metallurgy (PM) Ti-46Al-2Cr-2Nb-(B,W) (at.％) alloy was studied.Depending on the cooling rate and temperature,the different structures were obtained from the initial near-γ (NG) microstructures by heat treatment in the α+γ field.The results show that the microstructures of samples after furnace cooling (FC) consist primarily of equiaxed γ and α2 grains,with a few grains containing lamellae.Duplex microstructures consist mainly of γ grains and lamellar colonies were obtained in the quenching into another furnace at 900℃ (QFC) samples.However,further increasing of the cooling rate to air cooling (AC) induces the transformation of α→α2 and results in a microstructure with equiaxed γ and α2 grains,and no lamellar colonies are found.
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| 关 键 词： | γ-TiAl-based alloys powder metallurgy heat treatment duplex structure phase volume fractions |
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