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Growth and characterization of Al–Cu–Li quasicrystals

Published online by Cambridge University Press:  31 January 2011

J. M. Parsey Jr. ,
H. S. Chen ,
A. R. Kortan ,
F. A. Thiel ,
A. E. Miller  and
R. C. Farrow
J. M. Parsey Jr.
Affiliation:
AT & T Bell Laboratories, Murray Hill, New Jersey 07974
H. S. Chen
Affiliation:
AT & T Bell Laboratories, Murray Hill, New Jersey 07974
A. R. Kortan
Affiliation:
AT & T Bell Laboratories, Murray Hill, New Jersey 07974
F. A. Thiel
Affiliation:
AT & T Bell Laboratories, Murray Hill, New Jersey 07974
A. E. Miller
Affiliation:
AT & T Bell Laboratories, Murray Hill, New Jersey 07974
R. C. Farrow
Affiliation:
AT & T Bell Laboratories, Murray Hill, New Jersey 07974
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Abstract

The alloy system Al–Li–Cu was investigated extensively over the composition range 5.8–8 Al–Cu–3Li to develop a detailed understanding of the formation and properties of the icosahedral phase, known as T2. Material from the various charges was analyzed by optical and electron microscopy, energy dispersive x-ray analysis, differential thermal analysis, and differential scanning calorimetry. The role of the melt composition and the solidification velocity were found to be crucial in determining the micro- and macrostructure and the existence of the icosahedral phase. A pseudobinary phase diagram for the region around Al6CuLi3, is presented based on these analyses. Based on this phase diagram the largest single icosahedral crystals of Al5.1CuLi3 yet reported, with diameters greater than 1 cm, were produced by Bridgman methods.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 2 , April 1988 , pp. 233 - 237
Copyright
Copyright © Materials Research Society 1988

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