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Aging of the surface of an Al-Cr-Fe approximant phase in ambient conditions: chemical composition and physical properties

Published online by Cambridge University Press:  01 February 2011

D. Veys ,
P. Weisbecker ,
V. Fournée ,
B. Domenichini ,
S. Weber ,
C. Rapin  and
J. M. Dubois
D. Veys
Affiliation:
Laboratoire de Science et Génie des Matériaux et de Métallurgie UMR 7584 CNRS – INPL – UHP, Ecole des Mines de Nancy, Parc de Saurupt, F–54042 Nancy cedex, France.
P. Weisbecker
Affiliation:
Laboratoire de Science et Génie des Matériaux et de Métallurgie UMR 7584 CNRS – INPL – UHP, Ecole des Mines de Nancy, Parc de Saurupt, F–54042 Nancy cedex, France.
V. Fournée
Affiliation:
Laboratoire de Science et Génie des Matériaux et de Métallurgie UMR 7584 CNRS – INPL – UHP, Ecole des Mines de Nancy, Parc de Saurupt, F–54042 Nancy cedex, France.
B. Domenichini
Affiliation:
Laboratoire de Recherche sur la Réactivité des Solides, UMR 5613 CNRS –, Université de Bourgogne, Sciences Mirande, 9 avenue Alain Savary, F–21078 Dijon cedex, France.
S. Weber
Affiliation:
Laboratoire de Physique des Matériaux UMR 7556 CNRS – INPL – UHP, Ecole des Mines de Nancy, Parc de Saurupt, F–54042 Nancy cedex, France.
C. Rapin
Affiliation:
Laboratoire de Chimie du Solide Minérale UMR 7555, Université Henri Poincaré, F–54506 Vandoeuvre–les–Nancy cedex, France.
J. M. Dubois
Affiliation:
Laboratoire de Science et Génie des Matériaux et de Métallurgie UMR 7584 CNRS – INPL – UHP, Ecole des Mines de Nancy, Parc de Saurupt, F–54042 Nancy cedex, France.
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Abstract

We have investigated the surface properties of quasicrystalline and approximant phases in the Al-(Cu)-Cr-Fe system upon aging in ambient conditions. We found that some of these properties (like the electrochemical behavior, wetting or friction) slowly evolves with the length of exposure to normal atmospheric conditions, reaching a stable state only after several days. This report essentially focuses on one of these alloys, an Al65Cr27Fe8 approximant phase with g-brass structure. In a first part, we describe the effect of aging on the electrochemical behavior of this alloy and we propose an interpretation based on a simple electrical model of the oxidized surface. In a second part, we present a model describing the surface as a stacking of several layers (oxides, oxy-hydroxides, contamination) whose thickness evolves with time. The model is supported by X-ray reflectivity, angle-resolved photoemission spectroscopy and secondary neutral mass spectroscopy measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 805: Symposium LL – Quasicrystals , 2003 , LL8.8
Copyright
Copyright © Materials Research Society 2004

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References

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