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On the bcc, fcc, hcp, and amorphous polymorphs of Zr3Al

Published online by Cambridge University Press:  31 January 2011

A.R. Yavari ,
S. Gialanella ,
T. Benameur ,
R.W. Cahn  and
B. Bochu
A.R. Yavari
Affiliation:
LTPCM-CNRS UA29, Institut National Polytechnique de Grenoble, BP 75, Domaine Universitaire, 38402 St. Martin d'Hères, France
S. Gialanella
Affiliation:
Dpto di Ingegneria dei Materiali, Universita di Trento, Mesiano 38050, Italy
T. Benameur
Affiliation:
LTPCM-CNRS UA29, Institut National Polytechnique de Grenoble, BP 75, Domaine Universitaire, 38402 St. Martin d'Hères, France
R.W. Cahn
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, United Kingdom
B. Bochu
Affiliation:
CMTC, Institut National Polytechnique de Grenoble, BP 75, Domaine Universitaire, 38402 St. Martin d'Hères, France
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Abstract

Rapid solidification of the Zr3Al liquid alloy allows retention of the high temperature β–Zr solid solution with bcc structure. Mechanical grinding is shown to amorphize this metastable phase very easily. Calculations show that the retained bcc phase has a free energy above that of the amorphous phase. The density of bcc Zr3Al at room temperature is found to be 2% lower than that of its equilibrium L12-ordered fcc structure as determined from their respective lattice parameters. The bcc phase thus represents a 2% volume expansion with respect to the fcc structure.

Type
Communications
Information
Journal of Materials Research , Volume 8 , Issue 2 , February 1993 , pp. 242 - 244
Copyright
Copyright © Materials Research Society 1993

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References

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