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Related Experiment Videos

Double dendrite growth in solidification.

Brian Utter1, E Bodenschatz

  • 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA. utterbc@jmu.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
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This study explores doublon growth morphology in directional solidification, finding that doublon selection depends on solute concentration and sample orientation, not just undercooling.

Area of Science:

  • Materials Science
  • Crystallography
  • Physical Chemistry

Background:

  • Doublons, or symmetry-broken dendrites, are predicted diffusion-limited growth structures.
  • These structures are expected under conditions of large undercooling and low material anisotropy.

Purpose of the Study:

  • Investigate the growth morphology of doublons in directional solidification.
  • Determine the influence of solute concentration and sample orientation on doublon selection.
  • Contrast experimental findings with theoretical predictions for doublon formation.

Main Methods:

  • Directional solidification of succinonitrile with varying solutes (poly(ethylene oxide), acetone, camphor).
  • Controlled selection of low-anisotropy growth grains (near {111} plane).

Related Experiment Videos

  • Systematic variation of solute concentration and sample orientation.

    • Main Results:

    • Doublon selection is strongly dependent on solute concentration and sample orientation.
    • Doublons are observed at low concentrations (low solutal undercooling), contrary to predictions for pure materials.
    • Preferred growth directions for doublons were identified, and their stability was linked to orientation.
    • Transitions between seaweed and doublon growth morphologies were observed.

    Conclusions:

    • Solute concentration and sample orientation are critical factors in doublon selection during directional solidification.
    • Experimental results challenge existing theories that predict doublon formation primarily at high thermal undercooling.
    • The study highlights the complex interplay of diffusion, anisotropy, and composition in determining crystal growth patterns.