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Mechanical Properties and Phase Stability of WTaMoNbTi Refractory High-Entropy Alloy at Elevated Temperatures

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

High-temperature structural metals remain in high demand for aerospace aircraft, gas turbine engines, and nuclear power plants. Refractory high-entropy alloys (RHEAs) with superior mechanical properties at elevated temperatures are promising candidates for high-temperature structural materials. In this work, a WTaMoNbTi RHEA with adequate room temperature plasticity and considerable strength at 1600 °C was fabricated by vacuum arc-melting. The room temperature fracture strain of the as-cast WTaMoNbTi RHEA was 7.8%, which was about 5.2 times that of the NbMoTaW alloy. The alloy exhibited a strong resistance to high-temperature softening, with a high yield strength of 173 MPa and compressive strength of 218 MPa at 1600 °C. The WTaMoNbTi RHEA possessed excellent phase stability in the range of room temperature to 2000 °C. The dendritic grains grew into equiaxed grains after compression test at 1600 °C due to the dynamic recrystallization process at high temperature. This work presents a promising high-temperature structural material that can be applied at 1600 °C.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (Grant No. 2018YFC1902400), the National Natural Science Foundation of China (Grant No. 51975582).

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Authors and Affiliations

  1. Institute of Massive Amorphous Metal Science, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, China

    Yixing Wan, Jinyong Mo & Baolong Shen

  2. Defense Innovation Institute, Academy of Military Science, Beijing, 100071, China

    Xin Wang, Zhibin Zhang & Xiubing Liang

  3. School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, 211189, China

    Baolong Shen

  4. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China

    Yixing Wan & Jinyong Mo

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  1. Yixing Wan
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  2. Jinyong Mo
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  3. Xin Wang
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  5. Baolong Shen
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Correspondence to Baolong Shen or Xiubing Liang.

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Wan, Y., Mo, J., Wang, X. et al. Mechanical Properties and Phase Stability of WTaMoNbTi Refractory High-Entropy Alloy at Elevated Temperatures. Acta Metall. Sin. (Engl. Lett.) 34, 1585–1590 (2021). https://doi.org/10.1007/s40195-021-01263-9

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  • DOI: https://doi.org/10.1007/s40195-021-01263-9

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