Fan, Xianqiang, Shevchenko, Natalia, Tonry, Catherine E. H. ORCID: https://orcid.org/0000-0002-8214-0845, Clark, Samuel, Atwood, Robert C., Eckert, Sven, Pericleous, Kyriacos A ORCID: https://orcid.org/0000-0002-7426-9999, Lee, Peter D and Kao, Andrew ORCID: https://orcid.org/0000-0002-6430-2134 (2023) Controlling solute channel formation using magnetic fields. Acta Materialia, 256:119107. pp. 1-11. ISSN 1359-6454 (Print), 1873-2453 (Online) (doi:10.1016/j.actamat.2023.119107)

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Abstract

Solute channel formation introduces compositional and microstructural variations in a range of processes, from metallic alloy solidification, to salt fingers in ocean and water reservoir flows. Applying an external magnetic field interacts with thermoelectric currents at solid/liquid interfaces generating additional flow fields. This thermoelectric (TE) magnetohydrodynamic (TEMHD) effect can impact on solute channel formation, via a mechanism recently drawing increasing attention. To investigate this phenomenon, we combined in situ synchrotron Xray imaging and Parallel-Cellular-Automata-Lattice-Boltzmann based numerical simulations to study the characteristics of flow and solute transport under TEMHD. Observations suggest the macroscopic TEMHD flow appearing ahead of the solidification front, coupled with the microscopic TEMHD flow arising within the mushy zone are the primary mechanisms controlling plume migration and channel bias. Two TE regimes were revealed, each with distinctive mechanisms that dominate the flow. Further, we show that grain orientation modifies solute flow through anisotropic permeability. These insights led to a proposed strategy for producing solute channelfree solidification using a time-modulated magnetic field.

Item Type:	Article
Uncontrolled Keywords:	directional solidification; solute channel; magnetic field; thermoelectric magnetohydrodynamics
Subjects:	Q Science > Q Science (General) Q Science > QA Mathematics > QA75 Electronic computers. Computer science T Technology > T Technology (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA) Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG) Faculty of Engineering & Science > School of Computing & Mathematical Sciences (CMS)
Last Modified:	04 Jul 2023 10:23
URI:	http://gala.gre.ac.uk/id/eprint/43115

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