TiAl alloys have the advantageous properties of high specific strength, high specific stiffness, and excellent oxidation resistance, which have been utilized for turbine blades in aircraft engines and automobile engines [1][2][3] . The blades are used in high-temperature conditions, with oxidation resistance being one of the important indices in determining its application potential. TiAl alloys can exhibit good oxidation resistance after long-term thermal exposure at 700 °C [4] . But, when the temperature exceeds 800 °C, the continuous and dense Al 2 O 3 protective oxide film cannot be generated on the surface, and instead a mixed oxide consisting of TiO 2 and Al 2 O 3 is formed. TiO 2 has a loose structure and large oxygen permeability, which cannot prevent the diffusion of O atoms, resulting in insufficient oxidation resistance; thus, restricting their further application [5][6][7][8] . Therefore, enhancing the oxidation resistance of TiAl alloys above 800 °C has become an urgent problem [9] . Domestic and foreign scholars have obtained results regarding the oxidation resistance of TiAl alloys [10,11] . Studies

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