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Related Experiment Videos

Avalanches and scaling in plastic deformation.

Marisol Koslowski1, Richard LeSar, Robb Thomson

  • 1Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. marisol@lanl.gov

Physical Review Letters
|September 28, 2004
PubMed
Summary

This study models dislocation loop evolution in ductile crystals, revealing a power-law size distribution consistent with acoustic emission experiments and predicting key plastic deformation behaviors like hardening and yielding onset.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Condensed Matter Physics

Background:

  • Plastic deformation in crystalline materials involves complex, non-uniform dislocation motion.
  • Dislocation avalanches are a key characteristic of this process.

Purpose of the Study:

  • To investigate the evolution of dislocation loops during monotonic loading.
  • To analyze the size distribution of dislocation loops using a phase-field model.
  • To compare model predictions with experimental observations of plastic deformation.

Main Methods:

  • Development and application of an analytically solvable phase-field model for dislocations.
  • Simulation of dislocation loop evolution in ductile single crystals under monotonic loading.
  • Analysis of the resulting dislocation loop size distribution.

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Main Results:

  • The study found a power-law distribution of dislocation loop sizes, P(A) approximately A-sigma, with an exponent sigma=1.8+/-0.1.
  • This exponent aligns with findings from acoustic emission experiments.
  • The model successfully predicted macroscopic behaviors such as strain hardening and a peak in acoustic emission at yielding.

Conclusions:

  • The phase-field model provides a robust framework for understanding dislocation dynamics in crystalline materials.
  • The predicted dislocation loop size distribution and macroscopic behaviors are consistent with experimental data.
  • This research offers insights into the fundamental mechanisms governing plastic deformation and yielding.