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Thermoelectric effects on alloy solidification microstructure

Thermoelectric effects on alloy solidification microstructure

Kao, Andrew ORCID: 0000-0002-6430-2134, Pericleous, Koulis A. ORCID: 0000-0002-7426-9999, Patel, Mayur K. and Voller, Vaughan R. (2010) Thermoelectric effects on alloy solidification microstructure. In: Cockcroft, Steve L. and Maijer, Daan M., (eds.) Modeling of Casting, Welding, and Advanced Solidification Processes. John Wiley & Sons, Inc. / The Minerals, Metals & Materials Society, Warrendale, PA, USA, pp. 521-528. ISBN 978-0-87339-742-1 (hbk)

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Abstract

Thermoelectric currents in the presence of a magnetic field generate Lorentz forces which can drive fluid flow. In the case of dendritic growth a naturally occurring thermoelectric current exists and in the presence of a high magnetic field micro convections are generated. Experimental evidence has attributed changes in microstructure to this effect. A numerical model has been developed to study the flow field around an unconstricted equiaxed dendrite growing under these conditions. The growth is modeled in 2D and 3D by an enthalpy based method and a complex flow structure has been predicted. Using a pseudo-3D approximation for economy, realistic 2D simulations are obtained where a fully coupled transient scheme reveals significant changes to the dendrite morphology reflecting experimental evidence. There is a rotation of the preferred direction of growth and increased secondary branching.

Item Type: Book Section
Additional Information: [1] This paper forms part of a collection of papers from the 12th International Conference - MCWASP XII: Modeling of Casting, Welding and Advanced Solidification Processes XII - held 7-14 June 2009, in Vancouver, British Columbia, Canada.
Uncontrolled Keywords: dendritic-growth, MHD, thermoelectricity, enthalpy, undercooling
Subjects: T Technology > TS Manufactures
T Technology > TN Mining engineering. Metallurgy
Q Science > QA Mathematics
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Mechanics & Reliability Group
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Science & Engineering Group
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Fire Safety Engineering Group
School of Computing & Mathematical Sciences > Department of Computer Systems Technology
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Last Modified: 02 Mar 2019 15:51
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/1299

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