Natural ageing behaviour in Al-Cu alloys containing Sc and Z

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dc.contributor.authorJiang, Len_AU
dc.contributor.authorWood, Ken_AU
dc.contributor.authorKnott, RBen_AU
dc.contributor.authorSokolova, AVen_AU
dc.contributor.authorDorin, Ten_AU
dc.date.accessioned2023-08-04T04:39:07Zen_AU
dc.date.available2023-08-04T04:39:07Zen_AU
dc.date.issued2021-11-24en_AU
dc.date.statistics2023-04-21en_AU
dc.descriptionThis is an oral presentation only.en_AU
dc.description.abstractThe 2xxx series Al-Cu alloys have been extensively used as engineering structures and components of lightweight vehicles due to their excellent strength-to-weight ratio. Recent research has demonstrated that further substantial enhancement in the strength of Al-Cu alloys could be achieved by adding Sc and Zr by forming nano-sized Al3(Sc, Zr) dispersoids. However, further development and manufacturing of these new Sc and Zr-containing Al-Cu alloys are limited by a lack of basic understanding of the effect of Al3(Sc, Zr) dispersoids on the microstructural evolution during room temperature storage after quenching from solution treatment (called natural ageing). In this work, therefore, we have studied the effect of Al3(Sc, Zr) dispersoids on natural ageing behaviour in an Al-4wt.%Cu-0.1wt.%Sc-0.1wt.%Zr alloy using small-angle neutron and x-ray scattering (SANS and SAXS). The hardness measurement shows that the presence of Al3(Sc, Zr) dispersoids significantly delays the natural ageing kinetics of Al-Cu alloys. SANS was used to quantify the size distribution of Al3(Sc, Zr) dispersoids which is ~ 25 ± 3 nm. In-situ SAXS results show that the presence of Al3(Sc, Zr) dispersoids results in a significant delay in the solute clustering formation during natural ageing. This is attributed to the suppression of the natural ageing kinetics in the Al-Cu-Sc-Zr alloys. These results were confirmed by differential scanning calorimetry (DSC) and high resolution transmission electron microscopy (TEM). The suppression mechanism is hypothesized to come from the dispersoids and Sc solute acting as vacancy sinks which slows down the diffusion of solute at room temperatures. © 2021 The Authorsen_AU
dc.identifier.citationJiang, L., Wood, K., Knott, R., Sokolova, A., & Dorin, T. (2021). Natural ageing behaviour in Al-Cu alloys containing Sc and Z. Presentation to the ANSTO User Meeting, Online, 24-26 November 2021. Retrieved from: https://events01.synchrotron.org.au/event/146/contributions/4252/en_AU
dc.identifier.conferenceenddate2021-11-26en_AU
dc.identifier.conferencenameANSTO User Meeting 2021en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate2021-11-24en_AU
dc.identifier.urihttps://events01.synchrotron.org.au/event/146/contributions/4252/en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15087en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.relation.urihttps://events01.synchrotron.org.au/event/146/contributions/4252/en_AU
dc.subjectStrain agingen_AU
dc.subjectAlloysen_AU
dc.subjectZirconiumen_AU
dc.subjectAluminiumen_AU
dc.subjectSulfuren_AU
dc.subjectScatteringen_AU
dc.subjectSmall angle scatteringen_AU
dc.titleNatural ageing behaviour in Al-Cu alloys containing Sc and Zen_AU
dc.typeConference Presentationen_AU
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