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Evolution of solute clustering in Al-Cu-Mg alloys during secondary ageing
journal contribution
posted on 2010-03-01, 00:00 authored by Ross MarceauRoss Marceau, G Sha, R N Lumley, S P RingerThe 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.
History
Journal
Acta materialiaVolume
58Issue
5Pagination
1795 - 1805Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
1359-6454eISSN
1873-2453Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2009, Acta Materialia Inc.Usage metrics
Categories
Keywords
aluminium alloysage hardeningsolute clusteringsecondary ageingatom probe tomographyScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceAtom probe tomographATOM-PROBEGPB ZONESPRECIPITATIONRECONSTRUCTIONDECOMPOSITIONSTRENGTHKINETICSORIGINPHASESMechanical EngineeringCondensed Matter Physics
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