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Titolo:
The development of spatial correlations during Ostwald ripening: A test oftheory
Autore:
Snyder, VA; Alkemper, J; Voorhees, PW;
Indirizzi:
Northwestern Univ, Robert R McCormick Sch Engn & Appl Sci, Dept Mat Sci & Engn, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 ci & Engn, Evanston, IL 60208 USA
Titolo Testata:
ACTA MATERIALIA
fascicolo: 10, volume: 48, anno: 2000,
pagine: 2689 - 2701
SICI:
1359-6454(20000614)48:10<2689:TDOSCD>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICLE DIFFUSION PROBLEM; STAGE PHASE-SEPARATION; NUMERICAL-SIMULATION; VOLUME FRACTION; DROPLET GROWTH; DYNAMICS; DISPERSIONS; DEPENDENCE;
Keywords:
phase transformations; nucleation; growth; theory and modeling (kinetics, transport, diffusion);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Voorhees, PW Northwestern Univ, Robert R McCormick Sch Engn & Appl Sci, Dept Mat Sci & Engn, 2225 N Campus Dr, Evanston, IL 60208 USA Northwestern Univ 2225 N Campus Dr Evanston IL USA 60208 USA
Citazione:
V.A. Snyder et al., "The development of spatial correlations during Ostwald ripening: A test oftheory", ACT MATER, 48(10), 2000, pp. 2689-2701

Abstract

The coarsening of solid-Sn particles in a Pb-Sn liquid was studied under microgravity conditions. Spatial correlation functions were measured on plane sections in a low-volume fraction system undergoing Ostwald ripening. Thecorrelation functions changed with time in a way that indicated that the microstructure initially consisted of clusters of particles and evolved intoone which was more dispersed. The model by Akaiwa and Voorhees (AV) was used to study the effect of spatial correlations on the ripening process. We found that the initially highly correlated structure had no observable effect on the evolution of particle size distributions, but did have an effect on the coarsening rate of the system. Specifically, we determined that a structure consisting of clusters of particles coarsened faster than a system with a random, spatial arrangement of non-overlapping particles. We also found that the approach of the microstructure towards the steady-state regimecould be monitored more sensitively using spatial correlations rather thanusing particle size distributions. The spatial correlations and the particle size distributions measured from the experiment agreed well with those calculated from the AV simulations using the initial experimental correlations and size distribution. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. Ail rights reserved.

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Documento generato il 17/01/21 alle ore 18:16:39