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On some discrepancies in the literature about the formation of icosahedral quasi-crystal in Al–Cu–Fe alloys

Published online by Cambridge University Press:  31 January 2011

Jianian Gui ,
Jianbo Wang ,
Renhui Wang ,
Dahai Wang ,
Jing Liu  and
Fangyu Chen
Jianian Gui*
Affiliation:
Department of Physics, Wuhan University, Wuhan 430072, China
Jianbo Wang
Affiliation:
Department of Physics, Wuhan University, Wuhan 430072, China and Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, P.0. Box 2724, Beijing 100080, China
Renhui Wang
Affiliation:
Department of Physics, Wuhan University, Wuhan 430072, China and Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, P.0. Box 2724, Beijing 100080, China
Dahai Wang
Affiliation:
Department of Physics, Wuhan University, Wuhan 430072, China
Jing Liu
Affiliation:
Technical Center, Wuhan Iron and Steel Co., Wuhan 430080, China
Fangyu Chen
Affiliation:
Technical Center, Wuhan Iron and Steel Co., Wuhan 430080, China
*
a)Address all correspondence to this author.[email protected]
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Abstract

To clarify some discrepancies in the literature about the formation of icosahedral quasi-crystal (IQC) in Al–Cu–Fe alloys, microstructures, and constituent phases of Al62.5Cu25Fe12.5 and Al65Cu20Fe15 alloys were studied. Each dendritic arm of the primarily solidified λ–Al13Fe4 phase is a single crystal that possesses no definite orientation relationship with the IQC, formed by peritectic reaction (L + λ + β → IQC) or a solid-state reaction (Cu-rich phases + λ + β →?IQC). This fact disproves an assumption that λ-phase is an approximant of the IQC. Two types of cubic phase, β-phase with CsCl structure containing more Fe and τ3 phase, which is a superstructure and contains less Fe, were observed depending on the composition and thermal history of the samples.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 4 , April 2001 , pp. 1037 - 1046
Copyright
Copyright © Materials Research Society 2001

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