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Effects of Pack Rolling Temperature on Microstructure and Mechanical Properties of Powder Metallurgical Ti-45Al-7Nb-0.3W Alloy

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Abstract

Powder metallurgical Ti-45Al-7Nb-0.3W (at.%) alloys were pack rolled at temperatures of 1240°C, 1255°C, 1270°C, and 1285°C. The microstructures were investigated by scanning electron microscopy (SEM) and transmission electron microscopy. The tensile properties were tested at room temperature and 800°C. After rolling, the sheets exhibited duplex microstructures with refined grains. The tensile test results showed the sheet rolled at 1270°C displayed excellent room temperature tensile properties with an ultimate tensile strength (UTS) of 782 MPa and an elongation of 1.95%. When tested at 800°C, all sheets showed UTS of over 600 MPa and elongations of around 50%. The dislocation movements and mechanical twinning played important roles at the initial stage of rolling deformation. However, during the subsequent deformation process, the deformation mechanism should mainly be the result of dynamic recrystallization.

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Acknowledgements

This work is supported by the National Key Basic Research Program of China (2011CB605500), National Natural Science Foundation of China (51174233).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Huizhong Li, Yelong Qi, Xiaopeng Liang, Zijun Wang & Fengjian Sang

  2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China

    Huizhong Li, Xiaopeng Liang & Yong Liu

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  1. Huizhong Li
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  2. Yelong Qi
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  3. Xiaopeng Liang
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  4. Zijun Wang
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  6. Yong Liu
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Correspondence to Xiaopeng Liang.

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Li, H., Qi, Y., Liang, X. et al. Effects of Pack Rolling Temperature on Microstructure and Mechanical Properties of Powder Metallurgical Ti-45Al-7Nb-0.3W Alloy. JOM 69, 1806–1811 (2017). https://doi.org/10.1007/s11837-017-2474-8

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  • DOI: https://doi.org/10.1007/s11837-017-2474-8

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