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Microstructural evolution of a PM TiAl alloy during heat treatment in α+γ phase field

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Abstract

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°C (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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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    Meike Su, Lijing Zheng, Jie Yan & Hu Zhang

  2. Aerospace Research Institute of Materials & Processing Technology, Beijing, 100076, China

    Zebao Lang

Authors
  1. Meike Su
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  2. Lijing Zheng
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  3. Zebao Lang
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  4. Jie Yan
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  5. Hu Zhang
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Correspondence to Hu Zhang.

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Su, M., Zheng, L., Lang, Z. et al. Microstructural evolution of a PM TiAl alloy during heat treatment in α+γ phase field. Rare Metals 31, 424–429 (2012). https://doi.org/10.1007/s12598-012-0532-5

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  • DOI: https://doi.org/10.1007/s12598-012-0532-5

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