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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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