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Related Experiment Videos

Linear morphological stability analysis of the solid-liquid interface in rapid solidification of a binary system.

P K Galenko1, D A Danilov

  • 1Institute of Space Simulation, German Aerospace Center, Cologne 51170, Germany. Peter.Galenko@dlr.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 13, 2004
PubMed
Summary

This study analyzes interface stability during rapid solidification, introducing local nonequilibrium effects to predict morphological stability. The findings offer insights into solute diffusion and thermal gradients, crucial for material science applications.

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Area of Science:

  • Materials Science
  • Solidification Physics

Background:

  • Morphological stability of solid-liquid interfaces is critical in materials processing.
  • Previous models by Mullins and Sekerka, and Trivedi and Kurz, addressed rapid solidification but lacked local nonequilibrium considerations.

Purpose of the Study:

  • To extend the morphological stability model for rapid solidification by incorporating local nonequilibrium in solute diffusion.
  • To analyze linear morphological stability, including marginal and absolute stability, for rapidly moving interfaces.
  • To investigate interface stability under negative and positive thermal gradients and compare with experimental data.

Main Methods:

  • Analytical treatment of interface stability in linear approximation.
  • Extension of existing models to include local nonequilibrium solute diffusion.

Related Experiment Videos

  • Self-consistent analysis of linear morphological stability using a developing local nonequilibrium model.

    • Main Results:

    • A solution to heat and mass transport problems around a perturbed interface with local nonequilibrium solute diffusion was obtained.
    • The model provides a self-consistent analysis of linear morphological stability for rapidly moving interfaces.
    • Quantitative predictions for absolute morphological stability were compared with experimental results for Si-Sn alloys.

    Conclusions:

    • The developed local nonequilibrium model offers a more comprehensive understanding of interface stability during rapid solidification.
    • The study highlights the importance of local nonequilibrium effects in determining critical solute concentrations and interface breakdown.
    • Findings contribute to predicting and controlling microstructure formation in rapidly solidified materials.