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Phase-field simulation of coarsening of γ precipitates in an ordered γ′ matrix

Abstract : The evolution of the microstructure and coarsening kinetics of disordered γ precipitates in an ordered monovariant γ′ matrix was studied using a diffuse-interface phase-field model in two dimensions. Specifically, we studied the morphological evolution, average precipitate size and size distribution as a function of time for a given temperature and for different concentrations. It was found that the coarsening kinetics for the average particle size are described by a t1/3 power law with a rate constant that increases with the volume fraction of the γ phase. The particle size distribution scaled by the average particle size is time invariant. We find that the particle shapes are perturbed by elastic interaction and local distributions of γ particles. Comparison of the phase-field simulation results with experiments shows good qualitative agreements.
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Contributor : Julien Boisse Connect in order to contact the contributor
Submitted on : Thursday, March 9, 2017 - 4:46:20 PM
Last modification on : Sunday, October 16, 2022 - 11:20:38 PM

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J. Boisse, N. Lecoq, Renaud Patte, H. Zapolsky. Phase-field simulation of coarsening of γ precipitates in an ordered γ′ matrix. Acta Materialia, 2007, 55 (18), pp.6151 - 6158. ⟨10.1016/j.actamat.2007.07.014⟩. ⟨hal-01486138⟩



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