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Sequential Application of Glass Coverslips to Assess the Compressive Stiffness of the Mouse Lens: Strain and Morphometric Analyses
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Dislocation glasses: aging during relaxation and coarsening.

B Bakó1, I Groma, G Györgyi

  • 1Department of Materials Physics, Eötvös University, Pázmány sétány 1/A, 1117 Budapest, Hungary.

Physical Review Letters
|March 16, 2007
PubMed
Summary

Dislocation dynamics show glassy behaviors, including relaxation and cellular structure formation. Both processes exhibit aging, with slow power-law relaxation and gradual coarsening of structures.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Dislocation Dynamics

Background:

  • Dislocation dynamics are known to exhibit complex, glassy properties.
  • Understanding these properties is crucial for materials science and solid mechanics.

Purpose of the Study:

  • To numerically investigate the glassy dynamics of 2D edge dislocation systems.
  • To identify and characterize different types of glassy behavior in dislocations.
  • To analyze aging phenomena in dislocation systems under no applied stress.

Main Methods:

  • Numerical simulations of 2D edge dislocation systems.
  • Analysis of dislocation gliding on fixed, random axes.
  • Inclusion of dislocation climb and annihilation processes.

Main Results:

  • Two distinct glassy behaviors were identified: relaxation to a disordered state and formation of cellular structures.
  • Both correlation functions and diffusion coefficients demonstrated aging.
  • Slow power-law relaxation was observed in the first case, while the second case showed a dynamical exponent of approximately 6, indicating slow coarsening.

Conclusions:

  • Dislocation systems exhibit diverse glassy dynamics even without external stress.
  • Aging is a fundamental characteristic of these dislocation dynamics.
  • The formation and coarsening of cellular structures are slow processes governed by specific dynamical exponents.