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Pattern stability and trijunction motion in eutectic solidification.

S Akamatsu1, M Plapp, G Faivre

  • 1Groupe de Physique des Solides, CNRS UMR 7588, Universités Denis-Diderot et Pierre-et-Marie-Curie, Tour 23, 2 place Jussieu, 75251 Paris Cedex 05, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 9, 2002
PubMed
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Lamellar eutectic growth is stable over wider spacing ranges than previously thought, especially at low velocities. This stability arises from relaxing assumptions about lamellar growth direction during interface movement.

Area of Science:

  • Materials Science
  • Solidification Physics
  • Crystallography

Background:

  • Eutectic growth describes the simultaneous solidification of two or more phases from a melt.
  • Existing stability analyses predict limited stable spacings for lamellar eutectic growth.
  • Undercooling and interface kinetics are critical factors in solidification morphology.

Purpose of the Study:

  • To investigate the stability of lamellar eutectic growth beyond the predictions of current theories.
  • To explore the influence of growth velocity and spacing on eutectic morphology.
  • To identify the underlying mechanisms responsible for observed stability deviations.

Main Methods:

  • Experimental observations of eutectic growth under controlled conditions.
  • Phase-field simulations to model the solidification process.

Related Experiment Videos

  • Comparison of experimental and simulation results with theoretical predictions.

    • Main Results:

    • Lamellar eutectic growth demonstrates stability for a broader range of spacings than predicted, particularly at low velocities.
    • Overstabilization is observed below the point of minimum undercooling.
    • The findings challenge the assumption of local normal growth to the eutectic interface.

    Conclusions:

    • Current stability analyses for lamellar eutectic growth require revision.
    • Relaxing the assumption of normal growth provides a mechanism for observed overstabilization.
    • This work advances the understanding of eutectic solidification processes and morphology control.