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Modeling of diffusional phase transformation in multi-component systems with stoichiometric phases / J. Svoboda in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2905–2911 Titre : Modeling of diffusional phase transformation in multi-component systems with stoichiometric phases Type de document : texte imprimé Auteurs : J. Svoboda, Auteur ; F.D. Fischer, Auteur ; R. Abart, Auteur Année de publication : 2011 Article en page(s) : pp. 2905–2911 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Interdiffusion  Intermetallics  Phase  transformation  kinetics  Modeling  Kirkendall  effect Résumé : In many multi-component systems, phases can be considered stoichiometric. If two phases not stably coexisting are brought into contact, multiple new phases may nucleate at the interface and develop into a sequence of layers with different phase compositions, which grow between the original phases. Inert markers at the original contact may show “splitting” of the marker (Kirkendall) plane, called polyfurcation. Nearly exclusively binary systems have been studied theoretically or experimentally. A thermodynamic model for the kinetics of diffusional phase transformation in multi-component systems and motion of the polyfurcated Kirkendall plane is derived by the thermodynamic extremal principle. The degrees of freedom of the system are discussed rigorously. The model is demonstrated on simulations of kinetics in binary three-phase and ternary four-phase systems. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000339 [article] Modeling of diffusional phase transformation in multi-component systems with stoichiometric phases [texte imprimé] / J. Svoboda, Auteur ; F.D. Fischer, Auteur ; R. Abart, Auteur . - 2011 . - pp. 2905–2911. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2905–2911 Mots-clés : Interdiffusion  Intermetallics  Phase  transformation  kinetics  Modeling  Kirkendall  effect Résumé : In many multi-component systems, phases can be considered stoichiometric. If two phases not stably coexisting are brought into contact, multiple new phases may nucleate at the interface and develop into a sequence of layers with different phase compositions, which grow between the original phases. Inert markers at the original contact may show “splitting” of the marker (Kirkendall) plane, called polyfurcation. Nearly exclusively binary systems have been studied theoretically or experimentally. A thermodynamic model for the kinetics of diffusional phase transformation in multi-component systems and motion of the polyfurcated Kirkendall plane is derived by the thermodynamic extremal principle. The degrees of freedom of the system are discussed rigorously. The model is demonstrated on simulations of kinetics in binary three-phase and ternary four-phase systems. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000339