Abstract
The HfNbTaTiZrV refractory high-entropy alloy reinforced with 4vol.% Al2O3 displays excellent phase stability and mechanical properties at elevated temperatures. A superior compressive yield strength of 2700 MPa at room temperature, 1392 MPa at 800 °C, and 693 MPa at 1000 °C has been obtained. The improved yield strength results from multiple strengthening mechanisms caused by Al2O3 addition, including interstitial strengthening, grain boundary strengthening, and dispersion strengthening. Besides, the effects of interstitial strengthening increase with the temperature and is the main strengthening mechanism at 800 °C. These findings not only promote the development of oxide-reinforced RHEAs for challenging engineering applications but also provide guidelines for the design of refractory materials with multiple strengthening mechanisms.
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