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

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    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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