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Phase Equilibria at Internal Interfaces of Icosahedral Al–Mn–Pd

Published online by Cambridge University Press:  17 March 2011

Reinhard Lück ,
Tilo Gödecke  and
Conradin Beeli
Reinhard Lück
Affiliation:
Max-Planck-Institut für Metallforschung, Seestraße 92, D-70174 Stuttgart, Germany
Tilo Gödecke
Affiliation:
Max-Planck-Institut für Metallforschung, Seestraße 92, D-70174 Stuttgart, Germany
Conradin Beeli
Affiliation:
Solid State Physics Laboratory, ETH Zürich, CH-8093 Zürich, Switzerland
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Abstract

Highly faceted microholes (voids) in icosahedral Al-Mn-Pd quasicrystals form during annealing at temperatures between 750 and 830°C via classical Ostwald ripening. The specimens were single-phase icosahedral with a composition of Al71Mn9Pd20. If such a specimen containing voids is cooled to room temperature with a constant cooling rate of typically 0.6 to 5 K/min, the facets of the voids are frequently found to be decorated by a different material. The decorations have typically a morphology similar to fractals. Specimens rapidly quenched after isothermal heat treatments around 830°C never showed similar decorations. By X-ray microanalysis in a scanning electron microscope it has been found that this decoration material is considerably poorer in Al-content that the icosahedral phase, namely: Al60Mn10Pd30. Accordingly, these decorations are precipitations at the surfaces of voids inside a single-phase icosahedral matrix. This implies that these decorations are formed at the void surfaces bya diffusion induced local equilibrium. The local equilibrium can be understood on the basis of the equilbrium results in a single icosahedral phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K2.4
Copyright
Copyright © Materials Research Society 2001

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