Effects of magnetic fields on crystal growth

A. Kao, K. Pericleous, M. K. Patel, Vaughan R Voller

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The effects of a constant uniform magnetic field on thermoelectric currents during dendritic solidification were investigated using a two-dimensional enthalpy based numerical model. Using an approximation for three-dimensional unconstricted growth, the resulting Lorentz forces generate a circulating flow influencing the solidification pattern. Under the presence of a strong magnetic field secondary growth on the clockwise side of the primary arm of the dendrite was encouraged, whereas the anticlockwise side is suppressed due to a reduction in local free energy. The preferred direction of growth rotated in the clockwise sense under an anticlockwise flow. The tip velocity is significantly increased compared with growth in stagnant flow. This is due to a small recirculation at the tip of the dendrite; bringing in colder liquid and lowering the concentration of solute.

Original languageEnglish (US)
Pages (from-to)147-150
Number of pages4
JournalInternational Journal of Cast Metals Research
Volume22
Issue number1-4
DOIs
StatePublished - Nov 4 2009

Keywords

  • Binary alloy
  • Dendritic growth
  • Enthalpy
  • Magnetohydrodynamics
  • Thermoelectricity
  • Undercooling

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