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Related Experiment Videos

High-density liquidlike component facilitates plastic flow in a model amorphous silicon system.

M J Demkowicz1, A S Argon

  • 1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|August 25, 2004
PubMed
Summary

Plastic deformation in amorphous silicon (Si) is highly dependent on its initial density. Low-density Si shows significant yielding and softening due to a mix of solidlike and liquidlike components.

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Area of Science:

  • Materials Science
  • Computational Physics
  • Solid Mechanics

Background:

  • Amorphous silicon (Si) is a technologically important material.
  • Understanding the mechanical behavior of amorphous solids is crucial for material design.
  • Plastic deformation mechanisms in amorphous materials are complex and not fully understood.

Purpose of the Study:

  • To investigate the influence of initial density on the plastic deformation of amorphous silicon.
  • To elucidate the microscopic mechanisms governing the yielding and softening phenomena.

Main Methods:

  • Molecular dynamics (MD) simulations were employed.
  • The Stillinger-Weber potential was used to model amorphous silicon.
  • Simulations were performed under constant volume deformation.

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Main Results:

  • Plastic deformation of amorphous Si is highly sensitive to the initial unstressed state density.
  • Low-density amorphous Si exhibits pronounced yield, strain softening, and pressure drop.
  • A coexistence of solidlike and liquidlike atomic structures was observed.
  • Liquidlike regions, being denser, facilitate plastic flow.

Conclusions:

  • The initial density critically controls the plastic deformation behavior of amorphous silicon.
  • The presence and interplay of solidlike and liquidlike components dictate the observed mechanical response.
  • This finding provides insights into the mechanical failure and flow of amorphous materials.