Phase-field theory of grain growth in the presence of mobile second-phase particles / Srikanth Vedantam in Acta materialia, Vol. 58 N° 1 (Janvier 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 272–281 Titre : Phase-field theory of grain growth in the presence of mobile second-phase particles Type de document : texte imprimé Auteurs : Srikanth Vedantam, Auteur ; Ashis Mallick, Auteur Année de publication : 2010 Article en page(s) : pp. 272–281 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Phase field modeling Crystal growth Grain size Résumé : We have developed a phase-field model for grain growth in the presence of mobile second-phase particles. In this model, each grain and particle is represented by a unique order parameter. The grain boundaries sweep the mobile particles during grain growth. The particle velocity is taken to be proportional to the driving force arising from the curvature of the phase boundary in the neighborhood of the particle. The proportionality factor is the constitutive parameter representing the mobility of the particle. We first study the model in a one-dimensional axisymmetric setting and compare the results with theoretical calculations. We then study the interaction of a bicrystal grain boundary with a dilute distribution of particles. Finally we show the effect of particles on polycrystalline grain growth. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006004 [article] Phase-field theory of grain growth in the presence of mobile second-phase particles [texte imprimé] / Srikanth Vedantam, Auteur ; Ashis Mallick, Auteur . - 2010 . - pp. 272–281. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 272–281 Mots-clés : Phase field modeling Crystal growth Grain size Résumé : We have developed a phase-field model for grain growth in the presence of mobile second-phase particles. In this model, each grain and particle is represented by a unique order parameter. The grain boundaries sweep the mobile particles during grain growth. The particle velocity is taken to be proportional to the driving force arising from the curvature of the phase boundary in the neighborhood of the particle. The proportionality factor is the constitutive parameter representing the mobility of the particle. We first study the model in a one-dimensional axisymmetric setting and compare the results with theoretical calculations. We then study the interaction of a bicrystal grain boundary with a dilute distribution of particles. Finally we show the effect of particles on polycrystalline grain growth. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006004

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