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On the nucleus composition during isothermal alloy solidification.

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Summary
This summary is machine-generated.

This study introduces interface permeability to accurately determine alloy nucleus composition during solidification. This new method enhances understanding of nucleation and dendritic growth in alloys like Al-Si.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Computational Materials Science

Background:

  • Accurate determination of alloy nucleus composition during isothermal solidification remains a significant challenge.
  • Existing thermodynamic analyses often deviate from local equilibrium at migrating phase interfaces.

Purpose of the Study:

  • To introduce a kinetic scheme and interface permeability for precise nucleus composition determination.
  • To develop a pragmatic nucleation model for solidification simulations.
  • To investigate the influence of interface permeability on nucleation rate and driving force.

Main Methods:

  • Integration of a kinetic scheme with Hillert-Rettenmayr thermodynamic analysis.
  • Introduction of interface permeability to quantify energy dissipation and driving force at the liquid-solid interface.
  • Application of a proposed nucleation model in 3D phase-field simulations for an Al-Si alloy.

Main Results:

  • The interface permeability allows for unambiguous determination of nucleus composition.
  • A pragmatic nucleation model was successfully benchmarked and applied.
  • The study explored the effect of interface permeability on nucleation rate, initial nucleus composition, and nucleation driving force.

Conclusions:

  • The proposed interface permeability concept provides a robust method for determining nucleus composition during alloy solidification.
  • The developed nucleation model and its application in phase-field simulations offer valuable insights into solidification processes.
  • Understanding the influence of interface permeability is crucial for controlling alloy microstructure and properties.