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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: [email protected]
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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
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 6 , June 2006 , pp. 1409 - 1419
Copyright
Copyright © Materials Research Society 2006

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