首页|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

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

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  • NSTL
  • Elsevier
? 2021Using 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.

Aluminium-Scandium alloySynchrotron X-ray total scatteringEmpirical Potential Structure RefinementIn Operando Study of SolidificationLiquid Atomic Structure

Huang S.、Luo S.、Qin L.、Mi J.、Shu D.、Sun B.、Lunt A.J.G.、Korsunsky A.M.

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Department of Engineering University of Hull

Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University

Department of Mechanical Engineering University of Bath

Department of Engineering Science University of Oxford

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2022

10.1016/j.scriptamat.2021.114484

Scripta materialia

Scripta materialia

EISCI
ISSN：1359-6462
年,卷(期)：2022.211
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