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Formation of quasicrystalline phases in an Al–Cu–Co–Fe alloy obtained by using a gravity chill-casting technique

Published online by Cambridge University Press:  31 January 2011

R. Perez ,
A. Arizmendi ,
J.A. Juarez-Islas  and
L. Martinez
R. Perez
Affiliation:
Laboratorio de Cuernavaca, Instituto de Fisica UNAM P.O. Box 139-B, 62191 Cuernavaca Mor., Mexico
A. Arizmendi
Affiliation:
Laboratorio de Cuernavaca, Instituto de Fisica UNAM P.O. Box 139-B, 62191 Cuernavaca Mor., Mexico
J.A. Juarez-Islas
Affiliation:
Laboratorio de Cuernavaca, Instituto de Fisica UNAM P.O. Box 139-B, 62191 Cuernavaca Mor., Mexico
L. Martinez
Affiliation:
Laboratorio de Cuernavaca, Instituto de Fisica UNAM P.O. Box 139-B, 62191 Cuernavaca Mor., Mexico
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Abstract

A study of the quasicrystalline phases obtained from a quaternary alloy of Al–Cu–Co–Fe is carried out. The formation of these phases is based on a gravity chill-casting technique. The alloy was cast in a wedge-shaped copper mold. Optical and scanning electron micrographs show a characteristic dendritic growing in regions close to the wedge edge. These types of dendrites display apparent symmetries that resemble the tenfold, fivefold, and eightfold symmetries obtained in quasicrystalline materials. Electron diffraction patterns, in addition to x-ray diffraction patterns, show two kinds of quasicrystalline phases. The icosahedral and decagonal phases coexist in these types of alloys also with binary and ternary compounds of intermetallic nature.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 5 , May 1993 , pp. 985 - 988
Copyright
Copyright © Materials Research Society 1993

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References

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