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

研究成果: 雜誌貢獻文章

30 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)202-208
頁數7
期刊Journal of Crystal Growth
295
發行號2
DOIs
出版狀態已發佈 - 2006 十月 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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