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Interface properties and microstructural stabilization in elastically inhomogeneous multiphase systems.

Danny Perez1, Laurent J Lewis

  • 1Département de Physique et Regroupement Québécois sur les Matériaux de Pointe (RQMP), Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 16, 2007
PubMed
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Elasticity significantly impacts inclusion growth in multiphase alloys by influencing interface structure and energetics. This leads to shape modulations and stabilization of complex microstructures, controlled by interface elastic misfit.

Area of Science:

  • Materials Science
  • Computational Materials Science
  • Alloy Physics

Background:

  • Multiphase alloys exhibit complex microstructures crucial for material properties.
  • Understanding inclusion growth dynamics is key to controlling alloy performance.
  • Previous models often simplified or neglected elastic effects at interfaces.

Purpose of the Study:

  • To investigate the influence of elastic inhomogeneities on inclusion growth in multiphase alloys.
  • To elucidate the coupling between atomic-scale and macroscopic interface structures.
  • To identify key parameters controlling elastic effects on inclusion morphology and stability.

Main Methods:

  • Development and application of a two-dimensional multiscale model.
  • Utilizing time-dependent density-functional theory for lattice systems.

Related Experiment Videos

  • Numerical simulation of isolated inclusion growth dynamics.

    • Main Results:

    • Elastic inhomogeneities strongly affect inclusion shape and growth behavior.
    • Significant coupling observed between interface structure and local atomic arrangements.
    • Elasticity induces shape modulations and kinetic faceting at interfaces.
    • Oscillations in chemical potential observed, enabling multi-inclusion microstructure stabilization.

    Conclusions:

    • Interface elastic misfit is a critical parameter for controlling elastic effects in alloys.
    • Elastic interactions play a substantial role in determining alloy microstructure evolution.
    • The model provides insights into experimentally observed multi-inclusion phenomena.