Comptes Rendus
no. 3-4
Computational metallurgy and changes of scale / Métallurgie numérique et changements d'échelle
Mesoscopic modelling of precipitation: A tool for extracting physical parameters of phase transformations in metallic alloys
[Modélisation mésoscopique de la précipitation : Un outil pour extraire les paramètres physiques des transformations de phase dans des alliages métalliques]
Alexis Deschamps1  ; Michel Perez2
1 SIMAP, Grenoble INP, UMR CNRS 5266, Université Joseph-Fourier, 1130, rue de la Piscine, BP 75, 38402 St Martin d'Hérès cedex, France
2 Université de Lyon, INSA Lyon, MATEIS, UMR CNRS 5510, 7, avenue Jean-Capelle, 69621 Villeurbanne cedex, France
Comptes Rendus. Physique, Volume 11 (2010) no. 3-4, pp. 236-244.

La Théorie Classique de la Germination/Croissance est un puissant outil pour prédire des cinétiques de précipitation. Implémentée dans un modèle par classes de taille, cette approche permet de prédire l'évolution de la distribution de taille des précipités. Dans cet article, il est montré qu'un traitement de réversion (chauffage à une température qui entraine une dissolution partielle des précipités) peut être utilisé pour déterminer de façon indépendante tous les paramètres physiques du modèle : (i) la limite de solubilité est liée à la fraction volumique précipitée d'équilibre, (ii) l'énergie d'interface est liée au minimum de la fraction volumique précipitée, et (iii) le coefficient de diffusion est lié à la cinétique d'évolution du rayon moyen des précipités.

Classical Nucleation and Growth Theories provide a compelling framework predicting the nucleation and growth of precipitates. When implemented in a class model, such an approach provides the time evolution of the Particle Size Distribution. It is shown in this article that a reversion treatment (instantaneous heating of the microstructure to a temperature high enough to induce some dissolution of the precipitates) can be used to calibrate all physical parameters of the model independently: (i) the solubility limit of alloying element is related to the equilibrium volume fraction; (ii) the interfacial energy is related to the minimum of volume fraction evolution; and (iii) the diffusion constant is related to the kinetics of the precipitate radii evolution.

Publié le :
DOI : 10.1016/j.crhy.2010.07.005
Keywords: Precipitation, Classical Nucleation and Growth theories, Class model
Mot clés : Précipitation, Théorie Classique de la Germination/Croissance, Modèle par classes de taille
Alexis Deschamps 1 ; Michel Perez 2

1 SIMAP, Grenoble INP, UMR CNRS 5266, Université Joseph-Fourier, 1130, rue de la Piscine, BP 75, 38402 St Martin d'Hérès cedex, France
2 Université de Lyon, INSA Lyon, MATEIS, UMR CNRS 5510, 7, avenue Jean-Capelle, 69621 Villeurbanne cedex, France 
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Alexis Deschamps; Michel Perez. Mesoscopic modelling of precipitation: A tool for extracting physical parameters of phase transformations in metallic alloys. Comptes Rendus. Physique, Volume 11 (2010) no. 3-4, pp. 236-244. doi : 10.1016/j.crhy.2010.07.005. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2010.07.005/

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