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Sélection, élaboration et caractérisation d’alliages et de couches minces approximants Al-Cr-Fe

Abstract : We have studied the Al-Cr-Fe ternary system by preparing alloys in a broad range of compositions. Characterization of these alloys was carried out by X-ray diffraction, differential thermal analysis and transmission electron microscopy. We have established the existence range in the phase diagram for several new orthorhombic and monoclinic approximants of the decagonal phase that coexist with one or several gamma-brass phases. These compounds show strong structural links with approximant phases. The study of their optical properties shows a behaviour different of the one of metals. We have interpreted this behaviour in relation with the phase structures. These alloys exhibit an interesting oxidation resistance and present a very low wetting by water. A part of this study is concerned also with the preparation and characterization of Al-Cr-Fe approximant thin films deposited from the vapour phase. In particular, we observed the formation of a gamma-brass superstructure which presents structural features close to those of approximant phases. A study of the optical properties of the thin films was carried out byellipsometry in the visible range. These properties, as well as the wetting properties are similar to those of the bulk alloys.
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https://hal-univ-rennes1.archives-ouvertes.fr/tel-03040360
Contributor : Valérie Demange Connect in order to contact the contributor
Submitted on : Friday, December 4, 2020 - 12:09:23 PM
Last modification on : Tuesday, December 15, 2020 - 3:16:53 AM
Long-term archiving on: : Friday, March 5, 2021 - 6:51:02 PM

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Valerie Demange, M Urban, Président Beeli, Rapporteur Mayou, Rapporteur Arribart, et al.. Sélection, élaboration et caractérisation d’alliages et de couches minces approximants Al-Cr-Fe. Matériaux. Institut National Polytechnique de Lorraine (INPL), Vandoeuvre-lès-Nancy, FRA., 2001. Français. ⟨tel-03040360⟩

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