Nonlinear long-wave morphological instabilities in directional solidification system

Jin Yuan Hsieh, Chi Chuan Hwang

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Long-wave morphological instabilities in directional solidification of a dulite binary mixture are investigated. We present a new nonlinear evolution equation of the solid-liquid interface for lage surface energy. This evolution equation contains not only quadratic and cubic nonlinearity terms, but also terms whose nonlinearites are higher than cubic and terms which are nonlinear and with time derivatives. It is shown that, in the weakly nonlinear instability analysis, when surface energy is very large, the cubic nonlinearity terms can be neglected. However, as surface energy is only finite, these terms may become significant for instability effects. If the bifurcation is supercritical, the cubic terms tends to enlarge the steady-state amplitudes of disturbances. On the other hand, for subcritical bifurcation, the cubic terms will diminish the threshold amplitudes which should not be exceeded by the amplitudes of the initial disturbances in the linearly stable region if a stable solidification system is wanted.

Original languageEnglish
Pages (from-to)447-456
Number of pages10
JournalJournal of Crystal Growth
Volume126
Issue number2-3
DOIs
Publication statusPublished - 1993 Jan 2

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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