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Hot Workability and Superplasticity of Low-Al and High-Nb Containing TiAl Alloys

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Abstract

The superplastic deformation mechanism of low-Al and high-Nb containing TiAl alloy was investigated in compression mode. The experimental results showed that intense dynamic recrystallization (DRX) breaks the balance and leads to a significant drop in flow stress after the peak when deforming below 950°C. Arrhenius kinetic analysis revealed that the activation energy for superplastic compression first increased then decreased with temperature, suggesting a change in the deformation mechanism. Microstructure observations showed that, when deformed at 850°C, the deformation mechanism was grain-boundary sliding accommodated by γ-DRX, γ-intragranular deformation, and β/B2-phase decomposition, while the mechanism was grain-boundary sliding accommodated by γ-DRX, β/B2-DRX, and γ → β/B2 + α 2 phase transformation when deformed at 1000°C. After compression, the microstructure tended to be uniform, which may yield important information for the development of new deformation techniques for TiAl alloys.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51771150), the National Key Research and Development Program of China (No. 2016YFB0701303), the Aeronautical Science Foundation of China (No. 2015ZE53057), and the “111” Project (No. B08040).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Youyi Xilu, Xi’an, 710072, Shaanxi, People’s Republic of China

    Bin Tang, Fengtong Zhao, Yudong Chu, Hongchao Kou & Jinshan Li

  2. National & Local Joint Engineering Research Center for Precision Thermal Forming Technology of Advanced Metal Materials, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, People’s Republic of China

    Bin Tang, Hongchao Kou & Jinshan Li

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  1. Bin Tang
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  2. Fengtong Zhao
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  4. Hongchao Kou
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  5. Jinshan Li
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Correspondence to Bin Tang.

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Tang, B., Zhao, F., Chu, Y. et al. Hot Workability and Superplasticity of Low-Al and High-Nb Containing TiAl Alloys. JOM 69, 2610–2614 (2017). https://doi.org/10.1007/s11837-017-2576-3

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  • DOI: https://doi.org/10.1007/s11837-017-2576-3

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