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Gravity effect on thermal-solutal convection during solidification revealed by four-dimensional synchrotron imaging with compositional mapping

DOI: 10.1016/j.scriptamat.2019.12.026 DOI Help

Authors: T. Nelson (University of Birmingham) , B. Cai (University of Birmingham) , N. Warnken (University of Birmingham) , P. D. Lee (University College London) , E. Boller (ESRF-The European Synchrotron) , O. V. Magdysyuk (Diamond Light Source) , N. R. Green (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scripta Materialia , VOL 180 , PAGES 29 - 33

State: Published (Approved)
Published: April 2020

Abstract: The effect of gravity on thermo-solutal convection and its impact on solidification dynamics of an Al-15 wt%Cu alloy were studied using high speed synchrotron tomography. A method for mapping the composition of the solidifying samples was developed, enabling three-dimensional quantification of the time evolved solute concentration and dendrite morphology. Differences in solute segregation, dendrite morphology and fragmentation between upwards and downwards solidification were identified, which were attributed to buoyancy-modulated thermal-solutal convection.

Journal Keywords: Solidification; Gravity; 4D; Synchrotron tomography

Subject Areas: Materials

Facility: ESRF ID19 beamline