ABSTRACT The paper presents the effect of pre-oxidation on the high temperature oxidation behavior of γ-TiAl alloy. The pre-oxidation treatments were performed at 900 °C for 2 hours under various O and Ar mixtures, which resulted in the formation of very thin (200-300 nm) oxide scales and oxygen enriched subsurface layers, containing the α2-Ti3Al(O) and the Ti5Al3O2 Z-phases. It was revealed that the pre-oxidation treatment can lower the oxidation rate of the alloy up to 300 hours. Detailed high resolution STEM investigations were performed to characterize the oxide scales and metal-scale interfaces.

中文翻译：

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预氧化对γ-TiAl 900℃循环氧化性能的影响

摘要 本文介绍了预氧化对γ-TiAl 合金高温氧化行为的影响。在各种 O 和 Ar 混合物下，在 900 °C 下进行 2 小时的预氧化处理，导致形成非常薄（200-300 nm）的氧化皮和富氧亚表面层，其中含有 α2-Ti3Al(O ) 和 Ti5Al3O2 Z 相。结果表明，预氧化处理可以降低合金的氧化速率达 300 小时。进行了详细的高分辨率 STEM 研究以表征氧化层和金属层界面。