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Kinetics of mechanically induced anatase-to-rutile phase transformations under inelastic impact conditions / Emilio Napolitano in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3798–3804 Titre : Kinetics of mechanically induced anatase-to-rutile phase transformations under inelastic impact conditions Type de document : texte imprimé Auteurs : Emilio Napolitano, Auteur ; Gabriele Mulas, Auteur ; Stefano Enzo, Auteur Année de publication : 2011 Article en page(s) : pp. 3798–3804 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Mechanical  milling  Crystalline  oxides  Phase  transformation  kinetics Résumé : This work investigates the kinetics of the anatase-to-rutile phase transformation of TiO2 powders during ball milling. Two elementary stages are observed, namely the transformation of anatase to the TiO2 II phase and of this latter to rutile. Such consecutive reactions were studied under inelastic impact regimes. Based on a suitable modeling of transformation kinetics, the fraction of powder processed on average at each collision was estimated. The mass of powder involved in phase transformation and microstructural refinement processes at each collision was then worked out by a systematic variation of the powder charge inside the reactor. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001692 [article] Kinetics of mechanically induced anatase-to-rutile phase transformations under inelastic impact conditions [texte imprimé] / Emilio Napolitano, Auteur ; Gabriele Mulas, Auteur ; Stefano Enzo, Auteur . - 2011 . - pp. 3798–3804. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3798–3804 Mots-clés : Mechanical  milling  Crystalline  oxides  Phase  transformation  kinetics Résumé : This work investigates the kinetics of the anatase-to-rutile phase transformation of TiO2 powders during ball milling. Two elementary stages are observed, namely the transformation of anatase to the TiO2 II phase and of this latter to rutile. Such consecutive reactions were studied under inelastic impact regimes. Based on a suitable modeling of transformation kinetics, the fraction of powder processed on average at each collision was estimated. The mass of powder involved in phase transformation and microstructural refinement processes at each collision was then worked out by a systematic variation of the powder charge inside the reactor. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001692