A GENERAL-MODEL FOR THE CALCULATION OF CRYSTAL NUCLEATION KINETICS INBINARY MELTS

Authors
Citation
Xz. Zhang, A GENERAL-MODEL FOR THE CALCULATION OF CRYSTAL NUCLEATION KINETICS INBINARY MELTS, Acta materialia, 46(4), 1998, pp. 1135-1141
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
Journal title
ISSN journal
1359-6454
Volume
46
Issue
4
Year of publication
1998
Pages
1135 - 1141
Database
ISI
SICI code
1359-6454(1998)46:4<1135:AGFTCO>2.0.ZU;2-P
Abstract
A general model for the calculation of crystal nucleation kinetics in general binary melts was developed. The model calculates the free ener gy change of nucleation by maximizing it relative to the composition o f the nuclei. It was used to calculate crystal nucleation temperatures in binary systems and results were shown to agree well with maximum u ndercooling data obtained in dispersion experiments. If the solid and liquid solutions are regular solutions, the model reduces to the Thomp son and Spaepen model with slight approximation. The model is expresse d in differences between terms al arbitrary temperature and terms at t he liquidus temperature. This simplifies the calculation significantly . (C) 1998 Acta Metallurgica Inc.