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Plasticity and dislocation dynamics in a phase field crystal model.

Pak Yuen Chan1, Georgios Tsekenis, Jonathan Dantzig

  • 1Department of Physics, University of Illinois at Urbana-Champaign, Loomis Laboratory of Physics, 1110 West Green Street, Urbana, Illinois, 61801-3080, USA.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

This study reveals dislocation avalanche dynamics in plastic flow using a phase field crystal model. Findings connect these events to interface depinning, matching mean field theory predictions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Physics

Background:

  • Plastic flow in materials is characterized by complex dislocation dynamics.
  • Understanding the critical behavior of dislocation avalanches is key to predicting material failure.
  • Existing models often require artificial rules for dislocation creation.

Purpose of the Study:

  • To investigate the critical dynamics of dislocation avalanches during plastic flow.
  • To explore dislocation behavior using a phase field crystal model without ad-hoc rules.
  • To establish a connection between dislocation avalanches and interface depinning phenomena.

Main Methods:

  • Utilized a phase field crystal model to simulate dislocation behavior.
  • Applied shearing forces to a perfect crystal lattice to induce dislocation formation.
  • Analyzed avalanche event energy distributions using data collapsing techniques.

Main Results:

  • Dislocations were naturally generated, diffused, interacted, and annihilated within the model.
  • Avalanche events were observed and characterized.
  • A direct link between dislocation avalanche dynamics and interface depinning was confirmed.
  • Critical exponents derived from simulations aligned with mean field theory predictions.

Conclusions:

  • The phase field crystal model effectively captures natural dislocation avalanche dynamics.
  • Dislocation avalanches exhibit critical behavior analogous to interface depinning.
  • The study validates mean field theory in describing these critical exponents.