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Phase-field simulation of void migration in a temperature gradient / S.Y. Hu in Acta materialia, Vol. 58 N° 9 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3230–3237 Titre : Phase-field simulation of void migration in a temperature gradient Type de document : texte imprimé Auteurs : S.Y. Hu, Auteur ; C.H. Henager Jr., Auteur Année de publication : 2011 Article en page(s) : pp. 3230–3237 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Void  migration  Surface  and  bulk  diffusion  Vacancy  Temperature  gradient  Phase-field  model Résumé : A phase-field model simulating vacancy diffusion in a solid with a strong vacancy mobility inhomogeneity is presented. The model is used to study void migration via bulk and surface diffusion in a temperature gradient. The simulations demonstrate that voids migrate up the temperature gradient, and the migration velocity varies inversely with the void size, in agreement with theory. It is also shown that the current model has the capability to investigate the effects of surface diffusion, temperature gradient and vacancy concentration on the void migration velocity. An interesting potential application of the model is to study the kinetics of void migration and the formation of a central hole in nuclear fuels. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000571 [article] Phase-field simulation of void migration in a temperature gradient [texte imprimé] / S.Y. Hu, Auteur ; C.H. Henager Jr., Auteur . - 2011 . - pp. 3230–3237. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3230–3237 Mots-clés : Void  migration  Surface  and  bulk  diffusion  Vacancy  Temperature  gradient  Phase-field  model Résumé : A phase-field model simulating vacancy diffusion in a solid with a strong vacancy mobility inhomogeneity is presented. The model is used to study void migration via bulk and surface diffusion in a temperature gradient. The simulations demonstrate that voids migrate up the temperature gradient, and the migration velocity varies inversely with the void size, in agreement with theory. It is also shown that the current model has the capability to investigate the effects of surface diffusion, temperature gradient and vacancy concentration on the void migration velocity. An interesting potential application of the model is to study the kinetics of void migration and the formation of a central hole in nuclear fuels. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000571