The effect of nano-Y₂O₃ addition on microstructure and tensile properties of high-Al TiAl alloys prepared by induction skull melting is investigated. The result shows that the addition of nano-Y₂O₃ affords an obvious refinement in lamellar colony due to the heterogeneous nucleation. A crystallographic model is used to predict the α and γ nucleation potencies of Y₂O₃ particles during solidification. Besides, Y₂O₃ induces the solidification pathway of TiAl alloys into high-Al side, resulting in the increase of γ phase. Owing to fine grain strengthening and second phase strengthening, the tensile strength and elongation of TiAl–Y₂O₃ alloys are enhanced significantly at room temperature.

研究了纳米Y ₂ O _3的添加对感应铝熔炼制备的高铝TiAl合金组织和拉伸性能的影响。结果表明，由于异质成核，纳米Y ₂ O ₃的添加在片状菌落中提供了明显的细化。晶体学模型用于预测凝固过程中Y ₂ O ₃颗粒的α和γ成核能力。此外，Y ₂ O ₃诱导TiAl合金进入高Al侧的凝固途径，导致γ相的增加。由于细晶粒强化和第二相强化，TiAl–Y的拉伸强度和伸长率₂ O ₃合金在室温下显着增强。