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First Three-Dimensional Atomic Resolution Investigation of Thermally Grown Oxide on a FeCrAl Alloy

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Abstract

Thermally grown Al2O3 scales formed on a FeCrAl alloy, Kanthal APMT, were successfully analysed using pulsed green laser atom probe tomography. The alloy was exposed to 5 vol.% O2 + 95 vol.% N2 at 900 °C for 1 h, and covered by a thin layer of Al2O3. Cr segregation to some of the Al2O3 grain boundaries was observed. The continuous Cr-rich band, which contains a large number of Cr- and/or Fe- enriched nano-sized particles, was studied in detail. Four types of nanoparticles were found and analysed. Oxidation mechanisms at the initial stages are discussed based on the observations.

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Acknowledgments

We are grateful to the Swedish Research Council to provide financial support to acquire the atom probe tomography instrument. This work was carried out within the Swedish High Temperature Corrosion Centre (HTC). Fang Liu are grateful to Professors Krystyna Stiller and Hans-Olof Andrén, and Dr Mattias Thuvander for fruitful discussion.

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Authors and Affiliations

  1. Department of Applied Physics, Chalmers University of Technology, 41296, Göteborg, Sweden

    Fang Liu & Mats Halvarsson

  2. Department of Chemical and Biological Engineering, Chalmers University of Technology, 412 96, Göteborg, Sweden

    Kristina Hellström, Jan-Erik Svensson & Lars-Gunnar Johansson

  3. High Temperature Corrosion Centre, Chalmers University of Technology, 412 96, Göteborg, Sweden

    Lars-Gunnar Johansson

Authors
  1. Fang Liu
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  2. Mats Halvarsson
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  3. Kristina Hellström
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  4. Jan-Erik Svensson
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  5. Lars-Gunnar Johansson
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Correspondence to Fang Liu.

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Liu, F., Halvarsson, M., Hellström, K. et al. First Three-Dimensional Atomic Resolution Investigation of Thermally Grown Oxide on a FeCrAl Alloy. Oxid Met 83, 441–451 (2015). https://doi.org/10.1007/s11085-015-9530-y

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  • DOI: https://doi.org/10.1007/s11085-015-9530-y

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