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Dislocation motion in metals exhibits a stick-slip behavior, generating acoustic emissions (AE) that correlate with deformation energies. This study reveals a two-level structure in plastic events, linking AE signals to local deformation.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid Mechanics

Background:

  • Dislocation motion in materials often follows a stick-slip process, characterized by unpredictable strain bursts.
  • Acoustic emission (AE) measurements on bulk samples suggest scale-free size distributions for these events.
  • Understanding the link between AE signals and local deformation is crucial for materials characterization.

Purpose of the Study:

  • To investigate the relationship between acoustic emission signals and dislocation slip during the compression of zinc (Zn) micropillars.
  • To develop a unique experimental setup capable of detecting weak AE waves from dislocation slip.
  • To elucidate the underlying physics connecting deformation energies, AE signals, and the collective motion of dislocations.

Main Methods:

  • Compression experiments on micron-scale zinc (Zn) specimens.
  • Advanced acoustic emission (AE) measurements using a unique experimental setup.
  • Statistical analysis of deformation events and emitted AE signals.
  • Simulations to complement experimental findings.

Main Results:

  • A profound correlation was observed between the energies of deformation events and the emitted AE signals.
  • AE signals are concluded to be induced by the collective dissipative motion of dislocations.
  • AE data revealed a two-level structure of plastic events, previously appearing as single stress drops.
  • Dislocation avalanches and earthquakes show statistical similarities despite differences in scale and mechanism.

Conclusions:

  • The study successfully unravels the relationship between acoustic signal properties and local deformation events in metals.
  • Dislocation avalanches exhibit scale-free behavior and share statistical similarities with earthquakes.
  • The findings provide new insights into the fundamental mechanisms of plastic deformation and fracture.