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Metastable-Stable Phase Transformation Behavior of Al2O3 Scale Formed on Fe–Ni–Al Alloys

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Abstract

The oxidation behavior of Ni–Fe–41.5at.%Al alloys with different Fe/Ni ratios was investigated in air at 1000 °C in order to clarify the effect of Fe on the phase transformation of Al2O3 scale, using in-situ high-temperature X-ray diffraction by means of synchrotron radiation. The oxidation mass gain of alloys after 25 h of oxidation generally decreased with increasing Fe content; however, the initial oxidation mass gain was significantly decreased by increasing alloy Fe content. In-situ X-ray diffraction analysis indicated that higher alloy Fe contents promoted rapid formation of the stable α-Al2O3, while lower Fe in the alloy maintained the metastable Al2O3 for longer time oxidation. The effect of Fe on promoting α-Al2O3 formation can be explained by the initial formation of α-Fe2O3, whose structure is isomorphous with α-Al2O3. The additional effect of Fe on the growth rate of α-Al2O3 is also discussed.

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Acknowledgments

The synchrotron radiation experiments were performed at the BL19B2 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2012B1523).

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Authors and Affiliations

  1. Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-S8-3 Ookayama, Meguro-Ku, Tokyo, 152-8552, Japan

    Shigenari Hayashi & Suzue Yoneda

  2. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, N13 W8 Kita-ku, Sapporo, Hokkaido, 060-8628, Japan

    Yuto Takada & Shigeharu Ukai

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  1. Shigenari Hayashi
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  2. Yuto Takada
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  3. Suzue Yoneda
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  4. Shigeharu Ukai
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Correspondence to Shigenari Hayashi.

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Hayashi, S., Takada, Y., Yoneda, S. et al. Metastable-Stable Phase Transformation Behavior of Al2O3 Scale Formed on Fe–Ni–Al Alloys. Oxid Met 86, 151–164 (2016). https://doi.org/10.1007/s11085-016-9628-x

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  • DOI: https://doi.org/10.1007/s11085-016-9628-x

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