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3D local atomic structure evolution in a solidifying Al-0.4Sc dilute alloy melt revealed in operando by synchrotron X-ray total scattering and modelling

Huang, Shi; Luo, Shifeng; Qin, Ling; Shu, Da; Sun, Baode; Lunt, Alexander J G; Korsunsky, Alexander M; Mi, Jiawei

Authors

Shi Huang

Shifeng Luo

Ling Qin

Da Shu

Baode Sun

Alexander J G Lunt

Alexander M Korsunsky



Abstract

Using synchrotron X-ray total scattering and empirical potential structure refinement modelling, we studied systematically in operando condition the disorder-to-order local atomic structure transition in a pure Al and a dilute Al-0.4Sc alloy melt in the temperature range from 690 °C to 657 °C. In the liquid state, icosahedral short-range ordered Sc-centred Al polyhedrons form and most of them with Al coordination number of 10–12. As the melt is cooled to the semisolid state, the most Sc-centred polyhedrons become more connected atom clusters via vertex, edge and face-sharing. These polyhedrons exhibit partially icosahedral and partially face-centred-cubic symmetry. The medium-range ordered Sc-centred clusters with face-sharing are proved to be the “precursors” of the L12 Al3Sc primary phases in the liquid-solid coexisting state.

Citation

Huang, S., Luo, S., Qin, L., Shu, D., Sun, B., Lunt, A. J. G., …Mi, J. (2022). 3D local atomic structure evolution in a solidifying Al-0.4Sc dilute alloy melt revealed in operando by synchrotron X-ray total scattering and modelling. Scripta materialia, 211, Article 114484. https://doi.org/10.1016/j.scriptamat.2021.114484

Journal Article Type Article
Acceptance Date Dec 21, 2021
Online Publication Date Jan 9, 2022
Publication Date Apr 1, 2022
Deposit Date Apr 1, 2022
Publicly Available Date Apr 4, 2022
Journal Scripta Materialia
Print ISSN 1359-6462
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 211
Article Number 114484
DOI https://doi.org/10.1016/j.scriptamat.2021.114484
Keywords Aluminium-Scandium alloy, Synchrotron X-ray total scattering; Empirical Potential Structure Refinement; Liquid Atomic Structure; In Operando Study of Solidification
Public URL https://hull-repository.worktribe.com/output/3910489

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0

Copyright Statement
© 2022 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)





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