Abstract The discontinuous oxidation behaviour of Fe–25Al–5Cr-0.5Zr and Fe–25Al–5Cr-0.5Zr + TiC was investigated at 700 °C in air. The iron aluminides were oxidised for up to 1003 h using thermogravimetric analysis (TGA). DSC measurements were performed to analyse the transition temperature of D03/B2 phase. OLM, SEM/EDX and XRD were utilized to evaluate formed scales and internal protrusions. The results show the presence of Fe2O3, ZrO2 and metastable γ- and θ-Al2O3 at 700 °C. Furthermore, a decrease in the oxidation rate due to TiC addition, was observed. This is attributed to the reduced inner selective phase oxidation, which is dependent on the phase manifestation of (Fe,Al)2Zr and zirconium carbides.

中文翻译：

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Fe-25Al-5Cr-0.5Zr 和 Fe-25Al-5Cr-0.5Zr+TiC 在 700 °C 空气中微观结构相关高温氧化行为的研究

摘要 研究了 Fe-25Al-5Cr-0.5Zr 和 Fe-25Al-5Cr-0.5Zr + TiC 在 700 °C 空气中的不连续氧化行为。使用热重分析 (TGA) 将铝化铁氧化长达 1003 小时。进行DSC测量以分析D03/B2相的转变温度。OLM、SEM/EDX 和 XRD 被用来评估形成的氧化皮和内部突起。结果表明，在 700 °C 时存在 Fe2O3、ZrO2 和亚稳态 γ-和 θ-Al2O3。此外，观察到由于添加 TiC 导致氧化速率降低。这归因于减少的内部选择性相氧化，这取决于 (Fe,Al)2Zr 和碳化锆的相表现。