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Metastability at the nanometer scale

Published online by Cambridge University Press:  21 February 2011

P.J. DESRÉ
P.J. DESRÉ*
Affiliation:
Laboratoire de thermodynamique et physicochimie métallurgiques, Ecole Nationale supérieure d'Electrochimie et d'Electrométallurgie de Grenoble, BP75 38402, Saint Martin d'hères Cedex, France.
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Abstract

Under constraints and at the nanometer scale, transitory metastable states can be generated in multicomponents materials. Examples illustrating such specific states are presented. They concern i) The crystalline nucleation in a growing undercooled liquid droplet formed from a liquid parent phase, ii) The suppression of intermetallic nucleation in solid solutions or glasses subjected to sharp concentration gradients, iii) The nanocrystalline transitory state preceding amorphisation by ball milling. In connection with this latter example, a thermodynamic model for the nanocrytal to glass transition, based on an hypothesis of a topological disorder wetting at the nanograin boundaries, is proposed. Thermodynamics - Nucleation - Phase transitions - nanocrystals - metallic glasses

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 209
Copyright
Copyright © Materials Research Society 1998

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References

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