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The sample size effect in metallic glass deformation.

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The sample size dramatically affects how metallic glasses deform, making brittle materials behave plastically at small scales. This study explains this transition using thermodynamics and statistical physics, revealing key structural parameters.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Thermodynamics

Background:

  • The sample size effect on the deformation mode of glasses is poorly understood.
  • Materials that appear brittle at macroscopic scales exhibit plastic behavior at smaller sizes.

Purpose of the Study:

  • To explain the sample size effect on the deformation mode of metallic glasses.
  • To propose a thermodynamic model for local rearrangement zones activated by stress.

Main Methods:

  • Utilized a thermodynamic description of local rearrangement zones.
  • Employed the Poisson distribution to model zone statistics.
  • Applied statistical physics to incorporate entropy.
  • Defined a critical sample size for deformation mode transitions.

Main Results:

  • Developed a thermodynamic and statistical physics framework to explain the size-dependent deformation of metallic glasses.
  • The model successfully predicts the transition from brittle to plastic behavior with decreasing sample size.
  • Identified critical sample size as a key parameter governing deformation modes.

Conclusions:

  • The proposed model provides a robust explanation for the intriguing sample size effect in metallic glasses.
  • The findings reveal hidden structural parameters crucial for understanding the glassy state.
  • This work bridges the gap between macroscopic brittleness and microscopic plasticity in glasses.