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Related Experiment Videos

Diffusionless crystal growth in rapidly solidifying eutectic systems.

P K Galenko1, D M Herlach

  • 1Institute of Space Simulation, German Aerospace Center, Cologne 51170, Germany. Peter.Galenko@dlr.de

Physical Review Letters
|May 23, 2006
PubMed
Summary

Rapid eutectic growth transitions from solute diffusion-limited to diffusionless growth at a critical velocity. Above this speed, homogeneous crystal growth suppresses eutectic decomposition, forming a single phase with the initial composition.

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Area of Science:

  • Materials Science
  • Solidification Physics
  • Crystallography

Background:

  • Eutectic growth is crucial in alloy formation and phase transformations.
  • Understanding rapid solidification is key to controlling material microstructure.
  • Local nonequilibrium effects significantly influence solidification pathways.

Purpose of the Study:

  • To analyze rapid eutectic growth experiments using a local nonequilibrium model.
  • To derive an analytical solution for rapid lamellar eutectic growth.
  • To investigate the transition from diffusion-limited to diffusionless growth.

Main Methods:

  • Application of a local nonequilibrium model for solidification.
  • Analytical solution of the solute diffusion field during rapid eutectic growth.

Related Experiment Videos

  • Analysis of the solid-liquid interface velocity (V) relative to solute diffusion speed (V(D)).

    • Main Results:

    • A critical velocity V = V(D) marks the end of solute diffusion-limited eutectic growth.
    • At and above V(D), diffusionless growth of a chemically homogeneous phase occurs.
    • Eutectic decomposition is suppressed for V >= V(D).

    Conclusions:

    • Rapid solidification can lead to the formation of homogeneous crystalline phases, bypassing eutectic decomposition.
    • The critical velocity V(D) is a key parameter determining the growth mode.
    • This finding has implications for designing alloys with specific compositions and microstructures.