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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Metallic glass composites incorporate crystalline precipitates within an amorphous matrix.
  • Shape memory crystals can enhance the mechanical properties of metallic glasses.
  • Understanding precipitate characteristics is crucial for tailoring composite behavior.

Purpose of the Study:

  • To investigate the influence of crystalline precipitate characteristics on the deformation behavior of metallic amorphous Cu64Zr36 composites with B2 CuZr inclusions.
  • To elucidate the mechanisms behind the enhanced plasticity and work-hardening capability of these composites.
  • To compare deformation mechanisms with composites containing pure copper crystals.

Main Methods:

  • Molecular dynamics simulations were employed to model the deformation behavior.
  • Systematic variation of precipitate density, distribution, and size was analyzed.
  • Deformation mechanisms were examined at the atomic level.

Main Results:

  • A low density of small B2 inclusions hinders critical shear band formation by controlling plastic zone distribution.
  • A high volume fraction of large B2 precipitates is required to stabilize shear flow and prevent instability when mature shear bands form.
  • Shape memory metallic glass composites sustain large tensile deformation due to complex, competing deformation mechanisms, even with low crystalline volume fractions.

Conclusions:

  • The interplay between precipitate characteristics and amorphous matrix governs the deformation mechanisms in metallic glass composites.
  • Tailoring precipitate microstructure is essential for achieving superior mechanical properties, particularly enhanced plasticity.
  • Shape memory crystals play a critical role in enabling significant tensile deformation in these advanced materials.