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Growth of stable Al–Pd–Mn icosahedral phase

Published online by Cambridge University Press:  31 January 2011

C. Dong ,
J.M. Dubois ,
M. de Boissieu ,
M. Boudard  and
C. Janot
C. Dong
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (CNRS URA 159), Ecole des Mines, Parc de Saurupt, 54042 Nancy, France
J.M. Dubois
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (CNRS URA 159), Ecole des Mines, Parc de Saurupt, 54042 Nancy, France
M. de Boissieu
Affiliation:
Laboratoire de Thermodynamique et Physico-Chimie Métallurgique (CNRS UA29), ENSEEG, BP75, 38402 Saint-Martin d'Hères, France
M. Boudard
Affiliation:
Institut Laue Langevin, BP156X, 38042 Grenoble, France
C. Janot
Affiliation:
Institut Laue Langevin, BP156X, 38042 Grenoble, France
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Abstract

We have carried out a detailed investigation of the Al71Pd19Mn10 alloy by using a combination of experimental techniques (neutron diffraction, electron diffraction, high resolution electron microscopy, and electron probe microanalysis). This alloy contains only the perfect icosahedral phase. This icosahedral phase is stable from room temperature up to its melting, though a transient cubic metastable phase coexists with it during the heating. It grows directly from liquid without involving any crystalline phase. Its isothermal growths at different temperatures can well be described by the Avrami equation with exponent n = 1.85. Comparisons with the Al–Cu–Fe I phase have also been made. The growth velocity of both I phases is approximately 1 μm/min with ΔT around 10 K, much slower than that of the crystalline phases growing under the same condition. After the sample was maintained at near liquidus temperature for more than 10 h, element losses and Si contamination from the crucible changed the sample composition. In consequence, crystalline phases have formed during the subsequent cooling and made the growth of the icosahedral phase a eutectic reaction.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 12 , December 1991 , pp. 2637 - 2645
Copyright
Copyright © Materials Research Society 1991

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