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Effects of Positive Feedback on Crystallization Kinetics and Recalescence

Published online by Cambridge University Press:  01 February 2011

Sven Bossuyt  and
A. Lindsay Greer
Sven Bossuyt
Affiliation:
Vrije Universiteit Brussel, Department of Mechanics of Materials and Constructions, VUB—TW—MeMC, Pleinlaan 2, B—1050 Brussels, Belgium.
A. Lindsay Greer
Affiliation:
University of Cambridge, Department of Materials Science and Metallurgy, Pembroke Street, Cambridge CB2 3QZ, UK.
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Abstract

In bulk metallic glasses cooled at nearly the critical cooling rate for glass formation, nucleation is observed to be spatially localized; nanocrystals are clustered together in spherical regions. This implies that a positive feedback mechanism locally increases the nucleation rate in the vicinity of other nucleation events. Linear stability analysis and computer simulation of differential equations describing crystal nucleation and growth are used to theoretically examine the plausibility of different potential feedback mechanisms. It is shown that interactions between different crystallizing phases can lead to counter-intuitive composition dependence of the crystallization kinetics in the case of non-polymorphic crystallization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003 , MM1.3
Copyright
Copyright © Materials Research Society 2004

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References

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