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B2 Grain Growth Behavior of a Ti-22Al-25Nb Alloy Fabricated by Hot Pressing Sintering

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Abstract

Grain growth behavior of a powder metallurgy (P/M) Ti-22Al-25Nb alloy was investigated by applying a series of isothermal treatment tests over a wide range of temperatures and holding times. An isothermal treatment scheme was conducted in the B2 phase region (1070-1110 °C) and α2 + B2 phase region (1010-1050 °C) at holding times of 10, 30 min, 1, 2, and 3 h, respectively. The effects of temperature and holding time on the microstructure evolution and microhardness of the P/M Ti-22Al-25Nb alloy at elevated temperatures were evaluated using optical microscope, scanning electron microscope, x-ray diffraction, and Vickers hardness test techniques. The results revealed that the alloy’s treated microstructure was closely linked to temperature and holding time, respectively. The change law of B2 grain growth with holding time and temperature can be well interpreted by the Beck equation and Hillert equation, respectively. The B2 grain growth exponent n and activation energy Q were acquired based on experimental data in the α2 + B2 and B2 phase regions. In addition, the grain growth contour map for the P/M Ti-22Al-25Nb alloy was constructed to depict variations in B2 grain size based on holding time and temperature.

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Acknowledgments

The present research has been supported by the Natural Science Foundation of Hebei Province (Project No. E2016203157), the Science and Technology Foundation of Qinhuangdao City (Project No. 201602A008), the Doctor Foundation of Yanshan University (Project No. B936), and the Research Program for Young Teachers of Yanshan University (Project No. 15LGB003).

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Authors and Affiliations

  1. Education Ministry Key Laboratory of Advanced Forging and Stamping Technology and Science, Yanshan University, Qinhuangdao, 066004, China

    Jianbo Jia, Wenchao Liu, Yan Xu & Junting Luo

  2. College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China

    Jianbo Jia, Wenchao Liu, Yan Xu, Chen Chen & Yue Yang

  3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China

    Junting Luo

  4. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China

    Kaifeng Zhang

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  1. Jianbo Jia
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  2. Wenchao Liu
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  3. Yan Xu
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  4. Chen Chen
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  5. Yue Yang
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  6. Junting Luo
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  7. Kaifeng Zhang
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Correspondence to Yan Xu.

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Jia, J., Liu, W., Xu, Y. et al. B2 Grain Growth Behavior of a Ti-22Al-25Nb Alloy Fabricated by Hot Pressing Sintering. J. of Materi Eng and Perform 27, 2288–2297 (2018). https://doi.org/10.1007/s11665-018-3353-3

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  • DOI: https://doi.org/10.1007/s11665-018-3353-3

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