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Disconnection flow-mediated grain rotation.

Caihao Qiu1, Marco Salvalaglio2,3, David J Srolovitz4

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|December 28, 2023
PubMed
Summary
This summary is machine-generated.

Grain rotation in polycrystalline materials is driven by disconnections, which are line defects. This study introduces a model showing how disconnection flow influences grain orientation and interface evolution.

Keywords:
continuum modellinggrain boundarygrain growthgrain rotationmaterials science

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Area of Science:

  • Materials Science
  • Crystallography
  • Continuum Mechanics

Background:

  • Grain rotation is a common phenomenon in polycrystalline materials like metals and ceramics.
  • Interface migration is understood to be driven by the movement of disconnections (line defects).

Purpose of the Study:

  • To propose a continuum model that respects crystallography for grain boundaries and interfaces.
  • To investigate the role of disconnections in grain rotation and microstructure evolution.

Main Methods:

  • Development of a crystallography-respecting continuum model for curved interfaces.
  • Numerical simulations to analyze the effects of disconnection flow on grain orientation and interface morphology.
  • Comparison of model predictions with molecular dynamics simulations.

Main Results:

  • Disconnection flow was shown to alter grain orientations and interface morphology.
  • Internal stress fields were found to be associated with disconnection flow.
  • Model predictions align with molecular dynamics results for capillarity-driven grain boundary evolution.

Conclusions:

  • The proposed continuum model effectively captures the role of disconnections in grain rotation.
  • The model provides a framework for understanding microstructure evolution driven by interface migration.
  • This work offers insights into the fundamental mechanisms governing polycrystalline material behavior.