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Al2O3 scale development on iron aluminides

Published online by Cambridge University Press:  01 June 2006

X.F. Zhang,
K. Thaidigsmann,
J. Ager and
P.Y. Hou
X.F. Zhang
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
K. Thaidigsmann
Affiliation:
Department of Material Sciences and Surface Technology, University for Applied Science, 73430 Aalen, Germany
J. Ager
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
P.Y. Hou*
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
*
a) Address all correspondence to this author. e-mail: pyhou@lbl.gov
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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.

Keywords

AlloysOxidationMicrostructure

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Type
Articles
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Journal of Materials Research , Volume 21 , Issue 6 , June 2006, pp. 1409 - 1419
Copyright
Copyright © Materials Research Society 2006

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