Evolution of solute clustering in Al–Cu–Mg alloys during secondary ageing / R.K.W. Marceau in Acta materialia, Vol. 58 N° 5 (Mars 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1795–1805 Titre : Evolution of solute clustering in Al–Cu–Mg alloys during secondary ageing Type de document : texte imprimé Auteurs : R.K.W. Marceau, Auteur ; G. Sha, Auteur ; R.N. Lumley, Auteur Année de publication : 2011 Article en page(s) : pp. 1795–1805 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Aluminium alloys Age hardening Solute clustering Secondary ageing Atom probe tomography Résumé : The evolution of an atomistic-level nanostructure during the early stages of secondary ageing of a rapid hardening Al–1.1Cu–1.7Mg (at.%) alloy has been characterized by a combination of atom probe tomography (APT) and transmission electron microscopy. Quantitative APT analysis reveals key changes in the evolution of solute clusters during secondary ageing (T6I4 condition) that correlate with secondary hardness increments. The microstructures that cause peak hardness differ between the T6 and T6I4 tempers – the former is a result of solute clustering as well as the precipitation of GPB zones and S phase, whereas in the latter, secondary ageing promotes only the formation of solute clusters. Cu–Mg clusters with high Mg:Cu ratio have the most strengthening potency during secondary ageing in T6I4 heat treatment. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008003 [article] Evolution of solute clustering in Al–Cu–Mg alloys during secondary ageing [texte imprimé] / R.K.W. Marceau, Auteur ; G. Sha, Auteur ; R.N. Lumley, Auteur . - 2011 . - pp. 1795–1805. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1795–1805 Mots-clés : Aluminium alloys Age hardening Solute clustering Secondary ageing Atom probe tomography Résumé : The evolution of an atomistic-level nanostructure during the early stages of secondary ageing of a rapid hardening Al–1.1Cu–1.7Mg (at.%) alloy has been characterized by a combination of atom probe tomography (APT) and transmission electron microscopy. Quantitative APT analysis reveals key changes in the evolution of solute clusters during secondary ageing (T6I4 condition) that correlate with secondary hardness increments. The microstructures that cause peak hardness differ between the T6 and T6I4 tempers – the former is a result of solute clustering as well as the precipitation of GPB zones and S phase, whereas in the latter, secondary ageing promotes only the formation of solute clusters. Cu–Mg clusters with high Mg:Cu ratio have the most strengthening potency during secondary ageing in T6I4 heat treatment. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008003

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