Abstract
Herein, the mechanical properties and high-temperature oxidation of (TiZr)65-x-yNb15Mo20SixAly refractory high-entropy alloys were systematically investigated. Results indicate that alloying with Si improves the strength but reduces the plasticity of the alloy. Maintaining a proper ratio of Al/Si is crucial to achieve the optimal performance of the alloy. The (TiZr)50.5Nb15Mo20Si9.5Al5 has excellent high-temperature performance, with a yield strength of 815 MPa at 800°C and a compressive strain greater than 40 %. Moreover, the (TiZr)50.5Nb15Mo20Si9.5Al5 exhibits a superior oxidation resistance compared to (TiZr)55Nb15Mo20Si10 alloy at 1000℃. The introduction of Si enhances the oxidation resistance, decreases the diffusion of the Zr element at 1000 °C and facilitates internal oxidation and the creation of TiNb2O7. However, it is important to note that the doping of Al in the higher Si alloys has negative impacts on the oxidation resistance and mechanical properties.
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