Solute redistribution in dendritic solidification with diffusion in the solid

S. Ganesan, D. R. Poirier

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

An investigation of solute redistribution during dendritic solidification with diffusion in the solid has been performed using numerical techniques. The extent of diffusion in the solid during solidification is characterized by two parameters, namely the instantaneous and average diffusion parameters, respectively. These parameters are functions of the diffusion Fourier number, the partition ratio and the fraction solid. The diffusion Fourier number is that originally defined by Brody and Flemings; it is Dstf/ λ 2 with Ds = solute diffusivity in the solid, tf = local solidification time and λ = one-half of the characteristic dendrite arm spacing. The numerical results are presented as an approximate model, which is used to predict the average diffusion parameter. In turn, the average diffusion parameter can be used to calculate the composition of the interdendritic liquid during solidification in a simple manner. Also, an approximate model is presented to predict the solute distribution at the end of solidification. This result is put in a convenient form and is useful to those who wish to consider homogenization kinetics of as cast alloys.

Original languageEnglish (US)
Pages (from-to)851-859
Number of pages9
JournalJournal of Crystal Growth
Volume97
Issue number3-4
DOIs
StatePublished - Oct 1989

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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