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Interface dynamics and solute trapping in alloy solidification with density change.

Massimo Conti1, Marco Fermani

  • 1Dipartimento di Fisica, Universitá di Camerino, and Istituto Nazionale di Fisica della Materia, Via Madonna delle Carceri, I-62032 Camerino, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 15, 2003
PubMed
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We developed a phase-field model for binary alloy solidification, incorporating fluid dynamics. Increased fluid velocity significantly reduces interface mobility, impacting solidification behavior and interface temperature-growth rate relationships.

Area of Science:

  • Materials Science
  • Thermodynamics
  • Fluid Dynamics

Background:

  • Solidification of binary alloys is crucial for material properties.
  • Hydrodynamic effects arising from density differences between phases can influence solidification.
  • Existing models often neglect these complex fluid flow phenomena.

Purpose of the Study:

  • To develop and analyze a phase-field model for binary alloy solidification that includes hydrodynamic effects.
  • To investigate the impact of fluid flow on interface dynamics, solute trapping, and interface temperature-growth rate relationships.
  • To understand how density-driven convection affects the solidification process.

Main Methods:

  • Formulation of a phase-field model based on a generalized thermodynamic potential with squared gradient terms.

Related Experiment Videos

  • Derivation of governing equations using the principle of local positive entropy production.
  • Numerical solution of the model in one dimension to simulate solidification dynamics.

    • Main Results:

    • Solute trapping was found to be largely unaffected by fluid advection.
    • Interface mobility was significantly reduced with increasing fluid velocity.
    • The dependence of interface temperature on growth rate showed a reduced unstable branch and a shift in the maximum to lower velocities.

    Conclusions:

    • Hydrodynamic effects play a significant role in modifying interface mobility during binary alloy solidification.
    • The interplay between fluid flow and phase-field dynamics influences the fundamental relationships governing solidification.
    • This model provides a framework for understanding and predicting solidification behavior in systems with density-driven convection.