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Diffraction Study of The Transformation of an Al-Cu-Fe Atomized Powder Upon Annealing at 500°C

Published online by Cambridge University Press:  17 March 2011

P. Weisbecker ,
G. Bonhomme ,
A. Cael ,
L. Zhang  and
J.M. Dubois
P. Weisbecker
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (UMR 7584 CNRS-INPL), Ecole des Mines, Parc de Saurupt, F-54042 Nancy
G. Bonhomme
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (UMR 7584 CNRS-INPL), Ecole des Mines, Parc de Saurupt, F-54042 Nancy
A. Cael
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (UMR 7584 CNRS-INPL), Ecole des Mines, Parc de Saurupt, F-54042 Nancy
L. Zhang
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (UMR 7584 CNRS-INPL), Ecole des Mines, Parc de Saurupt, F-54042 Nancy
J.M. Dubois
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (UMR 7584 CNRS-INPL), Ecole des Mines, Parc de Saurupt, F-54042 Nancy
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Abstract

Using powder X-ray diffraction, we have studied the transformation of an atomized powder of nominal composition Al62Cu25.5Fe12.5 upon annealing at 500°C in air or in vacuum. The initial mixture of icosahedral and B2 cubic phases transforms within 2 hours into a nearly pure icosahedral compound. We observe however that a small amount of residual cubic phase is still present after annealings as long as 65 hours. Furthermore, the initial cubic phase splits in two components, a CsCl-type and a disordered bcc cubic phase. By comparison of the heat treatments in air and in vacuum, we point out that oxygen atoms diffuse into the icosahedral lattice.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K9.2
Copyright
Copyright © Materials Research Society 2001

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References

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