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On the solidification of Al62Cu20Co15Si3 and Al61Cu19.5Co14.5Si5 alloys

Published online by Cambridge University Press:  31 January 2011

B. Grushko ,
R. Wittmann  and
K. Urban
B. Grushko
Affiliation:
Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Postfach 1913, D-W5170 Jülich, Germany
R. Wittmann
Affiliation:
Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Postfach 1913, D-W5170 Jülich, Germany
K. Urban
Affiliation:
Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Postfach 1913, D-W5170 Jülich, Germany
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Abstract

The solidification behavior of Al62Cu20Co15Si3 and Al61Cu19.5Co14.5Si5 alloys was studied by means of optical metallography, scanning and transmission electron microscopy, energy-dispersive x-ray analysis, powder x-ray diffraction, and differential thermal analysis. Slowly as well as rapidly cooled ingots of both alloys contained a decagonal quasicrystalline phase as the dominant phase with, additionally, several minor crystalline phases. The structure of the rapidly solidified Si-containing alloys was similar to that of the ternary Al65Cu20Co15 alloy. In the slowly solidified alloys the substitution of 3 at. % Al by Si did not change the basic phase constitution. Si was only partially incorporated in the decagonal phase and a significant quantity of Si was found in elemental form. The increase of Si concentration to 5 at. % resulted in the appearance of new minor phases.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 10 , October 1992 , pp. 2713 - 2723
Copyright
Copyright © Materials Research Society 1992

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References

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