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Al2O3 scale development on iron aluminides

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Abstract

The structure and phase of the Al2O3 scale that forms on an Fe3Al-based alloy Fe-28Al-5Cr (at.%) was investigated by transmission electron microscopy and photoluminescence spectroscopy. Oxidation was performed at 900 °C and 1000 °C for up to 190 min. Transmission electron microscopy revealed that single-layer scales were formed after short oxidation times. Electron diffraction was used to show that the scales are composed of nanoscale crystallites of the θ, γ, and α phases of alumina. Band-like structure was observed extending along three 120°-separated directions within the surface plane. Textured θ and γ grains were the main components of the bands, whereas mixed α and transient phases were found between the bands. Extended oxidation produced a double-layered scale structure with a continuous α layer at the scale/alloy interface and a γ/θ layer at the gas surface. The mechanism for the formation of Al2O3 scales on iron aluminide alloys is discussed and compared with that for nickel aluminide alloys.

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Authors and Affiliations

  1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA

    X. F. Zhang, J. Ager & P. Y. Hou

  2. Department of Material Sciences and Surface Technology, University for Applied Science, 73430, Aalen, Germany

    K. Thaidigsmann

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  1. X. F. Zhang
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  2. K. Thaidigsmann
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  3. J. Ager
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  4. P. Y. Hou
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Correspondence to P. Y. Hou.

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Zhang, X.F., Thaidigsmann, K., Ager, J. et al. Al2O3 scale development on iron aluminides. Journal of Materials Research 21, 1409–1419 (2006). https://doi.org/10.1557/jmr.2006.0172

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  • DOI: https://doi.org/10.1557/jmr.2006.0172

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