Solute clustering behaviour during natural ageing in Al-Cu alloys containing Sc and Zr

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dc.contributor.authorJiang, Len_AU
dc.contributor.authorWood, Ken_AU
dc.contributor.authorSokolova, AVen_AU
dc.contributor.authorDorin, Ten_AU
dc.date.accessioned2025-12-05T03:59:04Zen_AU
dc.date.available2025-12-05T03:59:04Zen_AU
dc.date.issued2025-08-01en_AU
dc.date.statistics2025-10-22en_AU
dc.description.abstractThis study investigates the effects of scandium (Sc) and zirconium (Zr) microalloying on solute clustering in Al-Cu alloys during natural ageing. Using atom probe tomography (APT), we reveal a full suppression of Cu-rich cluster formation in the AlCuScZr alloy compared to its Sc- and Zr-free counterpart. Instead, a distinct type of cluster, comprising Si, Sc and Zr forms, preferentially at Al3(Sc, Zr) dispersoids/Al interfaces, driven by strong Si-Sc-vacancy and Si-Zr-vacancy binding energies. These sites act as vacancy traps, redirecting clustering pathways away from the Cu-rich clusters typically observed in Al-Cu alloys. Small-angle x-ray scattering (SAXS) indicates suggest that the natural ageing kinetics in the AlCuScZr alloys are significantly delayed, likely due to the limited availability of Si, Sc and Zr solutes in the matrix. As a result, the AlCuScZr alloy exhibits slower hardening response during natural ageing. This is the first report of Si-Sc-Zr cluster formation during natural ageing in Al alloys, providing critical insights into how dispersoids, solute interactions, and vacancies govern early-stage clustering and mechanical evolution. © 2025 The Authors. Published by Elsevier Inc. on behalf of Acta Materialia Inc. Open Access CC-BYen_AU
dc.identifier.articlenumber116764en_AU
dc.identifier.citationJiang, L., Wood, K., Sokolova, A., & Dorin, T. (2025). Solute clustering behaviour during natural ageing in Al-Cu alloys containing Sc and Zr. Scripta Materialia, 265, 116764. doi:10.1016/j.scriptamat.2025.116764en_AU
dc.identifier.issn1359-6462en_AU
dc.identifier.journaltitleScripta Materialiaen_AU
dc.identifier.urihttps://doi.org/10.1016/j.scriptamat.2025.116764en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16768en_AU
dc.identifier.volume265en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectAluminiumen_AU
dc.subjectCopperen_AU
dc.subjectAlloysen_AU
dc.subjectScandiumen_AU
dc.subjectZirconiumen_AU
dc.subjectTomographyen_AU
dc.subjectAgingen_AU
dc.subjectSolutesen_AU
dc.subjectHardeningen_AU
dc.titleSolute clustering behaviour during natural ageing in Al-Cu alloys containing Sc and Zren_AU
dc.typeJournal Articleen_AU
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