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Related Experiment Videos

Seaweed to dendrite transition in directional solidification.

Nikolas Provatas1, Quanyong Wang, Mikko Haataja

  • 1McMaster University, Department of Materials Science and Engineering, 1280 Main Street West, Hamilton, Ontario, Canada, L8S 4L7.

Physical Review Letters
|November 13, 2003
PubMed
Summary

We simulated crystal growth during directional solidification, observing a shift from seaweed to dendritic structures as the thermal gradient decreased. This finding helps predict crystal morphology based on growth conditions.

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Area of Science:

  • Materials Science
  • Physics
  • Computational Science

Background:

  • Directional solidification is crucial for controlling material microstructure.
  • Understanding crystal morphology transitions is key for material property optimization.
  • Phase-field modeling is a powerful tool for simulating complex interface phenomena.

Purpose of the Study:

  • To investigate the morphology transitions during directional solidification.
  • To analyze the influence of thermal gradient and pulling speed on crystal structure.
  • To develop a method for characterizing crystal morphology.

Main Methods:

  • Utilized a phase-field model with adaptive mesh refinement for simulations.
  • Simulated directional solidification with controlled surface tension anisotropy.

Related Experiment Videos

  • Analyzed local interface velocity distributions to characterize morphology.

    • Main Results:

    • Observed a crossover from seaweed to dendritic morphology with decreasing thermal gradient.
    • Results align with recent experimental findings for specific anisotropy conditions.
    • Established a link between local interface velocity and crystal morphology.

    Conclusions:

    • The local interface velocity distribution provides unambiguous characterization of crystal morphology.
    • Derived a semi-empirical estimate for the seaweed-to-dendrite transition.
    • The study offers insights into controlling microstructure during solidification.