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

  • B. Grushko (a1), R. Wittmann (a1) and K. Urban (a1)

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.

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

  • B. Grushko (a1), R. Wittmann (a1) and K. Urban (a1)

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