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A Thermodynamic Model for Amorphization and Topological Criteria

Published online by Cambridge University Press:  11 February 2011

O.N. Senkov ,
D.B. Miracle  and
S. Rao
O.N. Senkov
Affiliation:
UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH 45432–1894
D.B. Miracle
Affiliation:
Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLMD, Wright-Patterson AFB, OH 45433–7817
S. Rao
Affiliation:
UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH 45432–1894
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Abstract

A thermodynamic model for amorphization is developed which allows analysis of the effect of composition, atomic radii, and elastic constants of constitutive elements on amorphization. The model is based on comparison of the Gibbs free energy and entropy of a defective crystal and undercooled liquid. The glass transition temperatures for thermodynamically unstable amorphous phases are determined as a function of topological parameters of an alloy. It increases with an increase in the atomic size of the solvent element and it has a maximum at a specific alloy composition. Topological criteria for alloy compositions that can produce a thermodynamically stable amorphous state are outlined and discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC6.7
Copyright
Copyright © Materials Research Society 2003

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References

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