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Solute clustering in Al-Cu-Mg alloys during the early stages of elevated temperature ageing
journal contribution
posted on 2010-09-01, 00:00 authored by Ross MarceauRoss Marceau, G Sha, R Ferragut, A Dupasquier, S P RingerThe evolution of atomistic-level nanostructure during the early stages of elevated temperature ageing of rapid hardening (RH) Al–Cu–Mg alloys has been characterised by a combination of atom probe tomography (APT), transmission electron microscopy (TEM) and positron annihilation spectroscopy (PAS). APT analysis confirms that significant dispersions of small solute clusters form during ageing for 60 s at 150 °C. No zone-like precipitate structures were observed by TEM and APT examinations. These small clusters are believed to be responsible for the RH effect. Careful quantitative APT analysis reveals that a high density of Cu–Mg clusters with high Mg:Cu ratio gives the most potent strengthening response. Positron annihilation measurements also show that Cu–Mg clusters provide additional sites for vacancy stabilisation.
History
Journal
Acta materialiaVolume
58Issue
15Pagination
4923 - 4939Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
1359-6454eISSN
1873-2453Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2010, Acta Materialia Inc.Usage metrics
Categories
Keywords
aluminium alloysage hardeningsolute clusteringatom probe tomographypositron annihilationScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceATOM-PROBE TOMOGRAPHYPOSITRON-ANNIHILATIONREACTION-KINETICSALUMINUM-ALLOYSAGEING CHARACTERISTICSGPB ZONESPRECIPITATIONRECONSTRUCTIONMODELAGMechanical EngineeringCondensed Matter Physics
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