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Localized microstructures induced by fluid flow in directional solidification.

H Jamgotchian1, N Bergeon, D Benielli

  • 1Laboratoire Matériaux et Microélectronique de Provence (UMR CNRS 6137), Université d'Aix-Marseille III, Faculté des Sciences et Techniques de Saint-Jérôme, Case 151, 13397 Marseille Cedex 20, France.

Physical Review Letters
|November 3, 2001
PubMed
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This study reveals how microstructure localization occurs during directional solidification through multiscale interactions. It identifies specific patterns like focus-type and honeycomb-type, driven by fluid flow dynamics.

Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Solidification Science

Background:

  • Microstructure formation is crucial in material properties.
  • Understanding interface instabilities is key to controlling solidification.
  • Previous work predicted interface morphological instability in specific flow regions.

Purpose of the Study:

  • To uncover the dynamical process of microstructure localization.
  • To investigate multiscale interactions between instabilities during solidification.
  • To understand the formation and evolution of localized patterns.

Main Methods:

  • Directional solidification of a transparent alloy.
  • Observation of interface morphological instability.
  • Analysis of fluid flow and thermosolutal convection onset.

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Main Results:

  • Morphological instability observed at inward flow-stagnation regions.
  • Formation of focus-type and honeycomb-type localized patterns.
  • Pattern evolution dependent on fluid flow driving force.

Conclusions:

  • Multiscale interactions drive microstructure localization during solidification.
  • Thermosolutal convection analysis explains pattern dynamics and instability localization.
  • The findings provide a complete understanding of initial transient solidification dynamics.