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Icosahedral nanophases in the Al–Mn–Ce system

Published online by Cambridge University Press:  31 January 2011

R. Manaila ,
R. Popescu ,
A. Jianu ,
M. Constantin  and
A. Devenyi
R. Manaila
Affiliation:
National Institute for Physics of Materials, P.O.B. MG 7, RO-76900 Bucharest-Magurele, Romania
R. Popescu
Affiliation:
National Institute for Physics of Materials, P.O.B. MG 7, RO-76900 Bucharest-Magurele, Romania
A. Jianu
Affiliation:
National Institute for Physics of Materials, P.O.B. MG 7, RO-76900 Bucharest-Magurele, Romania
M. Constantin
Affiliation:
National Institute for Physics of Materials, P.O.B. MG 7, RO-76900 Bucharest-Magurele, Romania
A. Devenyi
Affiliation:
National Institute for Physics of Materials, P.O.B. MG 7, RO-76900 Bucharest-Magurele, Romania
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Extract

Nano-icosahedral phases were prepared by melt-spinning in the AlMnCe system (Al ≥ 89 at.%). Ce-induced structure alterations are reported by x-ray diffraction for the icosahedral (i) AlMnCe phase. They comprise apparition of superstructure diffraction lines, due to chemical ordering in the 6-dimensional icosahedral lattice, which gradually changes from a simple to a face-centered (FCI) type. Also, strong anomalies of diffracted intensities, with reference to model FCI phases, support Ce preferential location on a special set of sites. Microstructure investigations show a nanodispersion of i-AlMnCe in an Al-rich matrix, suggesting a low nucleation barrier of this metastable phase in the melt.

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Articles
Information
Journal of Materials Research , Volume 15 , Issue 1 , January 2000 , pp. 56 - 62
Copyright
Copyright © Materials Research Society 2000

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