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Decomposition of Quasicrystalline Phase in a Rapidly Solidified Ai-Fe-V-Si Alloy

Published online by Cambridge University Press:  28 February 2011

W. J. Park ,
S. Ahn  and
N.J. Kim
W. J. Park
Affiliation:
Dept. of Materials Science & Eng. and Center for Advanced Aerospace Materials, Pohang Institute of Science and Technology (POSTECH), Pohang, 790–600, Korea
S. Ahn
Affiliation:
Research Institute of Industrial Science and Technology (RIST), Pohang, 790-600, Korea
N.J. Kim
Affiliation:
Dept. of Materials Science & Eng. and Center for Advanced Aerospace Materials, Pohang Institute of Science and Technology (POSTECH), Pohang, 790–600, Korea
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Abstract

Decomposition of quasicrystalline phase formed in a rapidly solidified Al-Fe-V-Si alloy has been studied by TEM. The as-cast microstructure varies through the thickness of melt-spun ribbon; microeutectic precipitation of the bcc silicide near the wheel side, formation of globular quasicrystalline icosahedral phase with the microeutectic silicide phase at the middle of the ribbon, and the decomposition of quasicrystalline phase near the air side of the ribbon. During heating, as observed by annealing studies and by in-situ TEM studies, quasicrystalline phase decomposes into various phases such as aluminum, silicide and other unidentified phases. It has been shown that the preferential sites for the transformation are either at the center of quasicrystalline particles or at the quasicrystal/matrix interface, depending on the location of quasicrystalline particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 427
Copyright
Copyright © Materials Research Society 1991

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