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Approximants to the icosahedral and decagonal phases in the Al–Cu–Cr system

Published online by Cambridge University Press:  31 January 2011

S. Ebalard  and
F. Spaepen
S. Ebalard
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
F. Spaepen
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
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Abstract

A 1/1-type approximant to the AlCuCr icosahedral phase and approximants to a decagonal phase have been found in an as-cast Al65Cu20Cr15 ingot. Selected area electron diffraction indicates that the 1/1-type approximant consists of Mackay icosahedra arranged on a bcc lattice, similar to the α-AlMnSi cubic phase. Ordering of the glue atoms produces a base-centered orthorhombic superstructure, making the overall structure monoclinic P2/m, with lattice parameters a = 12.6 Å, c = 17.92 Å, and α = 90°.

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Articles
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Journal of Materials Research , Volume 6 , Issue 8 , August 1991 , pp. 1641 - 1649
Copyright
Copyright © Materials Research Society 1991

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