Phase field modeling of convective and morphological instability during directional solidification of an alloy

C. W. Lan, Min-Hung Lee, M. H. Chuang, C. J. Shih

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Phase field modeling is carried out to investigate the convective and morphological instability during directional solidification of a succinonitrile/acetone alloy. Considering the presence of gravity, we have found that the planar interface could become wrinkled even beyond the Mullins-Sekerka instability; this is originated from the lateral solute segregation induced by the flow. For the cases slightly above the onset of instability, morphologies of shallow cells are affected by the convection as well. The cells with different wavelengths and depths can coexist due to the flow-induced segregation. The coupling of long- (convective mode) and short wavelengths (morphological mode) is illustrated for the first time, which cannot be predicted by the linear stability theory. As the growth rate is further increased, the effect of the buoyancy decreases.

Original languageEnglish
Pages (from-to)202-208
Number of pages7
JournalJournal of Crystal Growth
Volume295
Issue number2
DOIs
Publication statusPublished - 2006 Oct 1

Keywords

  • A1. Adaptive phase field simulation
  • A1. Convection
  • A1. Morphological instability
  • A1. Solidification

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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