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Related Experiment Videos

Curvature effects in rapid alloy solidification.

M Conti1

  • 1Dipartimento di Matematica e 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
|April 20, 2001
PubMed
Summary

This study simulates crystal growth in alloys using a phase-field model. Thermal effects and solute rejection significantly influence growth dynamics, leading to complex regimes and sharp transitions in solidified alloys.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Computational Physics

Background:

  • Crystal growth into undercooled melts lacks a stationary regime, complicating analysis.
  • Quasistatic approximations simplify low-growth-rate scenarios but neglect crucial rapid solidification effects.
  • Recent research highlights the importance of thermal diffusion and nonequilibrium effects in rapid alloy solidification.

Purpose of the Study:

  • To simulate cylindrical and spherical crystal growth in supersaturated alloy melts using a phase-field model.
  • To investigate the influence of nonequilibrium effects, heat, and solute rejection on growth dynamics.
  • To identify and characterize different growth regimes and their transitions.

Main Methods:

  • Phase-field modeling to simulate time-dependent crystal growth.

Related Experiment Videos

  • Incorporation of nonequilibrium effects and the rejection of heat and solute.
  • Analysis of growth dynamics across various parameter spaces.

    • Main Results:

    • Observed complex growth behaviors and diverse dynamic regimes.
    • Identified growth rate limitations by thermal or chemical diffusion, or kinetic control.
    • Demonstrated sharp transitions between regimes with observable effects on solidified alloys.

    Conclusions:

    • For realistic Lewis numbers, thermal effects dominate, leading to a diffusive regime.
    • Solute rejection is the primary rate-limiting mechanism in the diffusive regime.
    • The phase-field model provides a comprehensive approach to understanding rapid alloy solidification dynamics.