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The Effect of Surface on the Kinetics of Crystallization of Pd-Si Glassy Metals

Published online by Cambridge University Press:  26 February 2011

A. Calka  and
A. P. Radliński
A. Calka
Affiliation:
Department of Solid State PhysicsResearch School of Physical SciencesThe Australian National UniversityGPO Box 4, Canberra, ACT, 2601, Australia.
A. P. Radliński
Affiliation:
Department of Solid State PhysicsResearch School of Physical SciencesThe Australian National UniversityGPO Box 4, Canberra, ACT, 2601, Australia.
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Introduction

The isothermal devitrification by nucleation and growth of metallic glasses is usually analysed using the Johnson-Mehl-Avrami (JMA) equation: where x is the volume fraction crystallized after time t, K is a thermally activated rate constant, τ is the nucleation lag time, and n is the so-called Avrami exponent. If the nucleation conditions and growth morphology remain unchanged during the crystallization then n is a constant. There is ample experimental evidence that for the Pd-Si system the growth process is either eutectic or interface-controlled. Therefore, one expects n=3 for crystallization on pre-existing nuclei (zero nucleation rate) and n=4 for crystallization at constant nucleation rate, both for three-dimensional growth. When the growth dimensionality is decreased by one these values decrease stepwise by one as well.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 80: Symposium G – Science and Technology of Rapidly Quenched Alloys , 1986 , 195
Copyright
Copyright © Materials Research Society 1987

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References

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[4] Calka, A. and Radliński, A.P., to be published in Acta Metall.Google Scholar
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