【摘要】 研究不同氧含量Ti-45Al-2Fe-2Mo-1Cr合金在空气中950°C下热处理100h的等温氧化行为,并计算其氧化动力学参数。实验结果表明,随着氧含量的增加,该合金的高温抗氧化性能下降,氧化质量增加和氧化膜的厚度增加。随着基体氧含量的变化,近氧化膜表面的合金显微组织呈现不同的形貌:在低氧含量的合金中,可见Z相;在中高氧含量的的合金中,可见τ₂（Al₂FeTi）相。随着氧含量增加,TiAl合金的内氧化现象加剧,其抗氧化性能降低。控制TiAl合金中的氧含量是提高其抗氧化性能的可行方式。更多还原

【Abstract】 Isothermal oxidation behaviors of Ti-45Al-2Fe-2Mo-1 Cr intermetallics with different oxygen contents were studied under the condition of 950 °C, 100 h in air, and the oxidation kinetic parameters were also evaluated. The results show that the oxidation resistance of the TiAl intermetallics is negatively related to the oxygen content, and both the mass gain and thickness of oxide scale increase with the oxygen content. The sub-surface microstructure of the oxide scales varies with the oxygen content. Z phase is observed in the sub-surface area of the low-oxygen-content alloy, while the τ₂（Al₂ FeTi） phase is found in the medium-oxygen-content and the high-oxygen-content alloys. The deterioration of oxidation resistance is due to the enhanced internal oxidation with the increase of oxygen content. It is possible to improve the oxidation resistance by controlling the oxygen content.更多还原