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dc.contributor.authorShah, Sohail
dc.contributor.authorThronsen, Elisabeth
dc.contributor.authorHatzoglou, Constantinos
dc.contributor.authorWenner, Sigurd
dc.contributor.authorMarioara, Calin Daniel
dc.contributor.authorHolmestad, Randi
dc.contributor.authorHolmedal, Bjørn
dc.identifier.citationMaterials Science and Engineering: A, 2022, 846, 1-10.en_US
dc.description.abstractThe cyclic application of mechanical stress to aluminum alloys at room temperature, referred to as cyclic ageing, continuously injects vacancies, enabling dynamic precipitation of a fine distribution of solute clusters. These are uniformly distributed throughout the bulk and are responsible for enhancing the mechanical properties to comparable values as T6 conditions obtained by conventional artificial aging. The atomic structure of the clusters in two Al–Zn–Mg (-Cu) alloys is studied using atomically resolved transmission electron microscopy, and their size, volume density and chemistry are investigated using atom probe tomography. It was found that cyclic ageing yields a high number density of solute clusters exhibiting structural similarities to the GPI zones commonly observed after low temperature ageing in such alloys. A subsequent 10-day natural ageing allows both cluster nucleation and further cluster growth, without altering their atomic structure. As compared to natural ageing, the strengthening caused by the solute clusters is accelerated during cyclic ageing, due to dynamic precipitation. The copper containing alloy also had higher amounts of Mg and Zn. Still, a slightly lower number density of smaller clusters with lower Zn/Mg ratio formed in this alloy, both after cyclic aging and after natural aging. The higher strength of this alloy is attributed to a higher strength contribution from each cluster.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectNatural ageingen_US
dc.subjectCyclic ageingen_US
dc.subjectTransmission electron microscopy (TEM)en_US
dc.subjectAtom probe tomography (APT)en_US
dc.subjectAluminum alloysen_US
dc.titleEffect of cyclic ageing on the early-stage clustering in Al–Zn-Mg(-Cu) alloysen_US
dc.title.alternativeEffect of cyclic ageing on the early-stage clustering in Al–Zn-Mg(-Cu) alloysen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2022 The Authors. Published by Elsevier B.Ven_US
dc.source.journalMaterials Science & Engineering: Aen_US
dc.relation.projectNorges forskningsråd: 294933en_US
dc.relation.projectNorges forskningsråd: 197405en_US
dc.relation.projectNorges forskningsråd: 269842en_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal