Influence of alloy composition and heat treatment on precipitate composition in Al–Zn–Mg–Cu alloys / T. Marlaud in Acta materialia, Vol. 58 N° 1 (Janvier 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 248–260 Titre : Influence of alloy composition and heat treatment on precipitate composition in Al–Zn–Mg–Cu alloys Type de document : texte imprimé Auteurs : T. Marlaud, Auteur ; Deschamps, A., Auteur ; F. Bley, Auteur Année de publication : 2010 Article en page(s) : pp. 248–260 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Aluminium alloys Small angle X-ray scattering Three-dimensional atom probe Phase transformation kinetics Résumé : The composition of precipitates in three alloys of the Al–Zn–Mg–Cu system has been investigated for different heat treatments, including peak-aged and over-aged states as well as near-equilibrium conditions, by combining atom probe tomography and systematic anomalous small-angle X-ray scattering experiments. We show that the concentration of Cu in the precipitates changes during heat treatments and is alloy dependent. At low ageing temperature (120 °C) the Cu content in the precipitates is close to the alloy content. The precipitate Cu content is shown to increase with increasing temperature and Cu alloy content. We show that in near-equilibrium conditions the precipitate compositions are 33 at.% in Mg, about 15 at.% in Al, about 13 at.% in Cu and balance Zn. Our results strongly suggest that the gradual incorporation of Cu in the precipitates during the heat treatment is essentially related to the slower diffusivity of this element in aluminium. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005989 [article] Influence of alloy composition and heat treatment on precipitate composition in Al–Zn–Mg–Cu alloys [texte imprimé] / T. Marlaud, Auteur ; Deschamps, A., Auteur ; F. Bley, Auteur . - 2010 . - pp. 248–260. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 248–260 Mots-clés : Aluminium alloys Small angle X-ray scattering Three-dimensional atom probe Phase transformation kinetics Résumé : The composition of precipitates in three alloys of the Al–Zn–Mg–Cu system has been investigated for different heat treatments, including peak-aged and over-aged states as well as near-equilibrium conditions, by combining atom probe tomography and systematic anomalous small-angle X-ray scattering experiments. We show that the concentration of Cu in the precipitates changes during heat treatments and is alloy dependent. At low ageing temperature (120 °C) the Cu content in the precipitates is close to the alloy content. The precipitate Cu content is shown to increase with increasing temperature and Cu alloy content. We show that in near-equilibrium conditions the precipitate compositions are 33 at.% in Mg, about 15 at.% in Al, about 13 at.% in Cu and balance Zn. Our results strongly suggest that the gradual incorporation of Cu in the precipitates during the heat treatment is essentially related to the slower diffusivity of this element in aluminium. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005989

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire