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In situ x-ray study of the γ- to α-Al2O3 phase transformation during atmospheric pressure oxidation of NiAl(110)

Published online by Cambridge University Press:  03 March 2011

A. Vlad ,
A. Stierle ,
N. Kasper ,
H. Dosch  and
M. Rühle
A. Vlad
Affiliation:
Max-Planck Institut für Metallforschung, D-70569 Stuttgart, Germany
A. Stierle*
Affiliation:
Max-Planck Institut für Metallforschung, D-70569 Stuttgart, Germany
N. Kasper
Affiliation:
Max-Planck Institut für Metallforschung, D-70569 Stuttgart, Germany; and Angströmquelle Karlsruhe (ANKA), FZ Karlsruhe, D-76344 Eggenstein-Leopoldshafen, Germany
H. Dosch
Affiliation:
Max-Planck Institut für Metallforschung, D-70569 Stuttgart, Germany; and Institut für Theoretische und Angewandte Physik, Universität Stuttgart, D-70550 Stuttgart, Germany
M. Rühle
Affiliation:
Max-Planck Institut für Metallforschung, D-70569 Stuttgart, Germany
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The oxidation in air of NiAl(110) was investigated in the temperature range from 870 °C–1200 °C by in situ x-ray diffraction and transmission electron microscopy. Oxidation at 870 °C and 1 bar oxygen leads to the formation of an epitaxial layer of γ-alumina showing an R30° orientation relationship with respect to the underlying substrate. At oxidation temperatures between 950 °C and 1025 °C, we observed a coexistence of epitaxial γ- and polycrystalline δ-Al2O3. The α-Al2O3 starts to form at 1025 °C and the complete transformation of metastable phases to the stable α-alumina phase takes place at 1100 °C. The fcc-hcp martensitic-like transformation of the initial γ-Al2O3 to epitaxial α-Al2O3 was observed. X-ray diffraction and cross-section transmission electron microscopy proved the existence of a continuous epitaxial α-Al2O3 layer between the substrate and the polycrystalline oxide scale, having a thickness of about 150 nm. The relative orientation relationship between the epitaxial alumina and the underlying substrate was found to be NiAl(110) || α-Al2O3 (0001) and [110] NiAl || [1120].

Keywords

OxidationPhase transformationX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 12 , December 2006 , pp. 3047 - 3057
Copyright
Copyright © Materials Research Society 2006

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