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Influence of the annealing atmosphere on the formation of Al–Cu–Fe quasicrystals

Published online by Cambridge University Press:  03 March 2011

Song-Seng Kang  and
Jean-Marie Dubois
Song-Seng Kang
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (CNRS VRA 159), Ecole des Mines, Parc de Saurupl, F-54042 Nancy Cedex, France
Jean-Marie Dubois
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (CNRS VRA 159), Ecole des Mines, Parc de Saurupl, F-54042 Nancy Cedex, France
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Abstract

Icosahedral samples of nominal composition Al63.5Cu24Fe12.5, which normally grow a rhombohedral approximant crystal, were submitted to heat treatments of various durations. The atmosphere in contact with the surface of the specimens was either dry air or secondary vacuum in order to test whether the formation of the icosahedral phase is sensitive or not to the nature of the atmosphere. Materials annealed in air showed a very thin surface layer of oxide which contained hydrogen. Beneath this oxide layer, small quantities of oxygen and hydrogen were also detected within the underlying lattice. This contamination was sufficient to shift the composition of the samples out of the stability domain of the icosahedral phase and has induced formation of a significant amount of the cubic phase. In contrast, the rhombohedral compound no longer appeared. This behavior goes along with the great sensitivity of the icosahedral phase stability to a sharply denfined electron to atom ratio.

Type
Communication
Information
Journal of Materials Research , Volume 10 , Issue 5 , May 1995 , pp. 1071 - 1074
Copyright
Copyright © Materials Research Society 1995

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References

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