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Study of decagonal approximant and γ-brass-type compounds in Al–Cr–Fe thin films

Published online by Cambridge University Press:  03 March 2011

V. Demange*
Affiliation:
Laboratoire de Science et Génie des Matériaux et de Métallurgie, UMR CNRS-INPL-UHP 7584, Ecole des Mines, Parc de Saurupt, F-54042 Nancy, France
J. Ghanbaja
Affiliation:
Service Commun de Microscopie Electronique à Transmission, UHP Nancy I, F-54042 Vandoeuvre-les-Nancy Cedex, France
C. Beeli
Affiliation:
Laboratory of Solid State Physics. ETH Zürich, CH-8093, Zurich, Switzerland
F. Machizaud
Affiliation:
Laboratoire de Science et Génie des Matériaux et de Métallurgie, UMR CNRS-INPL-UHP 7584, Ecole des Mines, Parc de Saurupt, F-54042 Nancy, France
J.M. Dubois
Affiliation:
Laboratoire de Science et Génie des Matériaux et de Métallurgie, UMR CNRS-INPL-UHP 7584, Ecole des Mines, Parc de Saurupt, F-54042 Nancy, France
*
a)Address all correspondence to this author. Present address: Laboratoire de Science et Génie des Surfaces, UMR CNRS 7570, Ecole des Mines, Parc de Saurupt, F-54042 Nancy, France. e-mail: valerie.demange@mines.inpl-nancy.fr
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Abstract

This paper reports the preparation conditions and structure characteristics of Al–Cr–Fe very thin films (10–30 nm) obtained by the flash evaporation technique. The films are either amorphous or crystallized, depending on the thickness of the sample and temperature of the substrate. Annealing of amorphous films leads to crystallization of intermetallic phases that are all linked with quasicrystals. In particular, we have identified by transmission electron microscopy the following structures: body-centered-cubic (bcc) γ-brass phase, monoclinic λ–Al13(Cr,Fe)4 phase, and orthorhombic O1-phase, all of them already observed in this system, together with four new structures, i.e., a face-centered-cubic (fcc) γ-brass phase (superstructure of the bcc phase), monoclinic λ′-phase (related to the λ-phase) and two orthorhombic phases (1/1/; 1/1) and (1/0; 2/1) approximants of the decagonal phase). In this study, we point out the occurrence of twin defects of the λ–Al13(Cr,Fe)4 phase. Films prepared directly in the crystalline state comprise the O1 approximant. Electron energy loss spectroscopy measurements show that all films are not oxidized except for the presence of a native oxide layer that forms in ambient atmosphere with a thickness that cannot exceed 0.3 nm. Optical properties were investigated and show that films need to be large enough (>30 nm) to reproduce the properties of bulk alloys. Finally, contact angle wetting measurements reveal that the presence of such films on a substrate, even at very low thickness, considerably decreases the wetting behavior by water.

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Articles
Copyright
Copyright © Materials Research Society 2004

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References

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