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Titolo:
On the growth of an intermediate phase in coherently stressed thin plates
Autore:
Johnson, WC;
Indirizzi:
Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22903 USA Univ Virginia Charlottesville VA USA 22903 Charlottesville, VA 22903 USA
Titolo Testata:
ACTA MATERIALIA
fascicolo: 5, volume: 48, anno: 2000,
pagine: 1021 - 1032
SICI:
1359-6454(20000314)48:5<1021:OTGOAI>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
BINARY DIFFUSION COUPLES; KINETICS;
Keywords:
phase transformations (nucleation, growth); theory and modeling (kinetics, transport, diffusion); thin films;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Johnson, WC Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22903 USA Univ Virginia Charlottesville VA USA 22903 ille, VA 22903 USA
Citazione:
W.C. Johnson, "On the growth of an intermediate phase in coherently stressed thin plates", ACT MATER, 48(5), 2000, pp. 1021-1032

Abstract

Cahn-Hilliard type equations are derived to study the competitive growth of three isostructural phases in a binary, stressed, thin-plate diffusion couple when the lattice parameter depends either linearly or quadratically onthe composition. Compositional stresses change qualitatively and quantitatively the evolution of the intermediate phase with respect to the stress-free case. Growth kinetics depend critically on whether the plate is free to bend or is affixed to a rigid substrate. The thickness of the intermediate phase is proportional to the square root of time for the rigid substrate case, but can depend on plate thickness and exceed a linear dependence on time for other conditions. Compositional strains can stabilize a non-equilibrium phase, prevent the growth of an equilibrium phase, and give rise to the stable coexistence of three coherent phases, in contradiction to the Gibbs phase rule for hydrostatically stressed systems. (C) 2000 Acta MetallurgicaInc. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 11/07/20 alle ore 17:24:35