Effects of atomic mobilities on phase separation kinetics: a Monte-Carlo study

M. Athènes; P. Bellon; G. Martin

doi:10.1016/S1359-6454(00)00060-4

Effects of atomic mobilities on phase separation kinetics: a Monte-Carlo study

M. Athènes, P. Bellon, G. Martin

Research output: Contribution to journal › Article › peer-review

Abstract

An atomistic kinetic model with a vacancy-mediated diffusion mechanism is used to study the precipitation kinetics from a supersaturated solid solution. For a given alloy thermodynamics, varying the asymmetry of the pairwise interaction energies determines the vacancy-solute binding energy and modifies the ratio of the solute to solvent mobility. We show that this asymmetry determines the weight of the coagulation process relative to the evaporation-condensation mechanism, and the location of the dynamical percolation limit. We also observe that when temperature is decreased, KJMA exponents increases, in agreement with experimental observations, but at variance with kinetic simulations carried out with the standard direct atom exchange dynamics.

Original language	English (US)
Pages (from-to)	2675-2688
Number of pages	14
Journal	Acta Materialia
Volume	48
Issue number	10
DOIs	https://doi.org/10.1016/S1359-6454(00)00060-4
State	Published - Jun 14 2000

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/S1359-6454(00)00060-4

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title = "Effects of atomic mobilities on phase separation kinetics: a Monte-Carlo study",

abstract = "An atomistic kinetic model with a vacancy-mediated diffusion mechanism is used to study the precipitation kinetics from a supersaturated solid solution. For a given alloy thermodynamics, varying the asymmetry of the pairwise interaction energies determines the vacancy-solute binding energy and modifies the ratio of the solute to solvent mobility. We show that this asymmetry determines the weight of the coagulation process relative to the evaporation-condensation mechanism, and the location of the dynamical percolation limit. We also observe that when temperature is decreased, KJMA exponents increases, in agreement with experimental observations, but at variance with kinetic simulations carried out with the standard direct atom exchange dynamics.",

author = "M. Ath{\`e}nes and P. Bellon and G. Martin",

note = "Funding Information: The authors are grateful to Drs J.-L. Bocquet, Y. Limoge, F. Soisson and Pr. V.G. Vaks for stimulating discussions. One of us (P.B.) also acknowledges support from the US Department of Energy, Basic Energy Sciences, Grant No. DEFG02-967ER45439 through the University of Illinois Materials Research Laboratory. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

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T2 - a Monte-Carlo study

AU - Athènes, M.

AU - Bellon, P.

AU - Martin, G.

N1 - Funding Information: The authors are grateful to Drs J.-L. Bocquet, Y. Limoge, F. Soisson and Pr. V.G. Vaks for stimulating discussions. One of us (P.B.) also acknowledges support from the US Department of Energy, Basic Energy Sciences, Grant No. DEFG02-967ER45439 through the University of Illinois Materials Research Laboratory. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2000/6/14

Y1 - 2000/6/14

N2 - An atomistic kinetic model with a vacancy-mediated diffusion mechanism is used to study the precipitation kinetics from a supersaturated solid solution. For a given alloy thermodynamics, varying the asymmetry of the pairwise interaction energies determines the vacancy-solute binding energy and modifies the ratio of the solute to solvent mobility. We show that this asymmetry determines the weight of the coagulation process relative to the evaporation-condensation mechanism, and the location of the dynamical percolation limit. We also observe that when temperature is decreased, KJMA exponents increases, in agreement with experimental observations, but at variance with kinetic simulations carried out with the standard direct atom exchange dynamics.

AB - An atomistic kinetic model with a vacancy-mediated diffusion mechanism is used to study the precipitation kinetics from a supersaturated solid solution. For a given alloy thermodynamics, varying the asymmetry of the pairwise interaction energies determines the vacancy-solute binding energy and modifies the ratio of the solute to solvent mobility. We show that this asymmetry determines the weight of the coagulation process relative to the evaporation-condensation mechanism, and the location of the dynamical percolation limit. We also observe that when temperature is decreased, KJMA exponents increases, in agreement with experimental observations, but at variance with kinetic simulations carried out with the standard direct atom exchange dynamics.

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Effects of atomic mobilities on phase separation kinetics: a Monte-Carlo study

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