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Grain boundaries are Brownian ratchets.

Caihao Qiu1, Maik Punke2, Yuan Tian3

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Grain boundaries act as Brownian ratchets, enabling unidirectional motion under specific conditions. This discovery, observed in nonsymmetric boundaries, offers new avenues for materials processing and microstructure control.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics

Background:

  • Grain boundaries (GBs) are crucial interfaces in materials, influencing properties and behavior.
  • Understanding GB dynamics is key to controlling material microstructure and performance.

Purpose of the Study:

  • To investigate the directional mobility and motion of grain boundaries under external stimuli.
  • To determine if grain boundaries can exhibit ratchet-like behavior.

Main Methods:

  • Molecular dynamics and phase-field crystal simulations were employed for various GB types and microstructures.
  • In situ experimental observations were conducted to validate simulation findings.
  • A Markov chain model was used for data analysis.

Main Results:

  • Nonsymmetric grain boundaries demonstrated direction-dependent mobilities and unidirectional motion.
  • Symmetric grain boundaries did not exhibit this ratchet behavior.
  • Simulations and experiments consistently showed these phenomena.

Conclusions:

  • Grain boundaries can function as Brownian ratchets, leading to directed motion.
  • This ratchet behavior in nonsymmetric GBs has significant implications for materials processing.
  • The findings enable tailored microstructure engineering through controlled GB dynamics.