Directional solidification with heat losses

K. Brattkus*, S. H. Davis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We consider the upward directional solidification of a dilute binary alloy in a tall, thin, two-dimensional slot. Heat losses from the sidewalls produce curved isotherms, interface deformations, and melt convection. We use an asymptotic approach which relates the small heat loss to the thinness of the solidification cell and solve for the resulting melt convection, interface deflection, and the distribution of heat and solute. The model is compared to the numerical results of Chang and Brown which exclude the effects of solute buoyancy and thermodynamic equilibrium at the interface. We compute the radial segregation at the interface (consistent with both interface shapes and temperature fields) and find that the radial segregation is independent of interfacial shapes; one cannot calculate the radial segregation from only a knowledge of the interface shape.

Original languageEnglish (US)
Pages (from-to)538-556
Number of pages19
JournalJournal of Crystal Growth
Volume91
Issue number4
DOIs
StatePublished - Sep 1988

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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