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Step Coalescence by Collective Motion at an Incommensurate Grain Boundary.

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Structural fluctuations at gold grain boundaries were studied. Coordinated atomic motion and stacking fault dynamics were revealed, offering insights into grain boundary migration mechanisms.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Grain boundaries significantly influence material properties.
  • Understanding interfacial atomic mechanisms is crucial for materials design.
  • Faceted grain boundary migration is controlled by step dynamics.

Purpose of the Study:

  • Investigate structural fluctuations at an incommensurate grain boundary in gold (Au).
  • Elucidate the atomic mechanisms governing the coalescence of interfacial steps.
  • Uncover the role of point defect diffusion in grain boundary transitions.

Main Methods:

  • Utilized extended time series scanning transmission electron microscopy (STEM) for atomic-resolution imaging.
  • Performed numerical simulations to model transition pathways.
  • Analyzed coordinated atomic motion along close-packed directions.

Main Results:

  • Observed the coalescence of two interfacial steps of different heights.
  • Identified a transition pathway involving the constriction and expansion of a stacking fault.
  • Found that enhanced point defect diffusion may initiate the transition.

Conclusions:

  • Provided new insights into the collective atomic motion driving step advance.
  • Highlighted the critical role of local atomic fluctuations and defect diffusion.
  • Advanced the understanding of mechanisms controlling faceted grain boundary migration.