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Disentangling the Effects of Curvature and Misorientation on the Shrinkage Behavior of Loop-Shaped Grain Boundaries

Camerin, Fabrizio LU orcid ; Marín-Aguilar, Susana ; Griffioen, Tim ; Baltussen, Mathieu G. ; Dullens, Roel P.A. ; Van Der Meer, Berend and Dijkstra, Marjolein (2025) In Physical Review Letters 135(17).
Abstract

The material properties of polycrystals are strongly affected by the evolution and coarsening of their internal grain structures. Yet, studying this process is challenging due to the complex interactions within grain boundary networks. Here, we systematically investigate the shrinkage of isolated loop-shaped grain boundaries in 2D colloidal crystals using a combination of simulations and experiments. Unexpectedly, we find that shear coupling decreases with increasing grain misorientation, contrary to geometric predictions. This counterintuitive result is attributed to enhanced concurrent sliding driven by the annihilation of dislocations. Furthermore, by focusing on the evolution of the grain size, we reveal a transition in shrinkage... (More)

The material properties of polycrystals are strongly affected by the evolution and coarsening of their internal grain structures. Yet, studying this process is challenging due to the complex interactions within grain boundary networks. Here, we systematically investigate the shrinkage of isolated loop-shaped grain boundaries in 2D colloidal crystals using a combination of simulations and experiments. Unexpectedly, we find that shear coupling decreases with increasing grain misorientation, contrary to geometric predictions. This counterintuitive result is attributed to enhanced concurrent sliding driven by the annihilation of dislocations. Furthermore, by focusing on the evolution of the grain size, we reveal a transition in shrinkage kinetics between small and large loop sizes, providing an explanation for previously observed discrepancies in grain boundary mobility. These findings reveal a more intricate dependence of grain boundary behavior on curvature and misorientation than previously reported, offering new insights into polycrystal coarsening dynamics.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
135
issue
17
article number
178202
publisher
American Physical Society
external identifiers
  • pmid:41202249
  • scopus:105021068529
ISSN
0031-9007
DOI
10.1103/krvx-hbt3
language
English
LU publication?
yes
id
c3e098e1-83f9-451f-91a2-f2956dcff6bb
date added to LUP
2025-12-16 13:41:09
date last changed
2025-12-17 03:44:45
@article{c3e098e1-83f9-451f-91a2-f2956dcff6bb,
  abstract     = {{<p>The material properties of polycrystals are strongly affected by the evolution and coarsening of their internal grain structures. Yet, studying this process is challenging due to the complex interactions within grain boundary networks. Here, we systematically investigate the shrinkage of isolated loop-shaped grain boundaries in 2D colloidal crystals using a combination of simulations and experiments. Unexpectedly, we find that shear coupling decreases with increasing grain misorientation, contrary to geometric predictions. This counterintuitive result is attributed to enhanced concurrent sliding driven by the annihilation of dislocations. Furthermore, by focusing on the evolution of the grain size, we reveal a transition in shrinkage kinetics between small and large loop sizes, providing an explanation for previously observed discrepancies in grain boundary mobility. These findings reveal a more intricate dependence of grain boundary behavior on curvature and misorientation than previously reported, offering new insights into polycrystal coarsening dynamics.</p>}},
  author       = {{Camerin, Fabrizio and Marín-Aguilar, Susana and Griffioen, Tim and Baltussen, Mathieu G. and Dullens, Roel P.A. and Van Der Meer, Berend and Dijkstra, Marjolein}},
  issn         = {{0031-9007}},
  language     = {{eng}},
  number       = {{17}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Disentangling the Effects of Curvature and Misorientation on the Shrinkage Behavior of Loop-Shaped Grain Boundaries}},
  url          = {{http://dx.doi.org/10.1103/krvx-hbt3}},
  doi          = {{10.1103/krvx-hbt3}},
  volume       = {{135}},
  year         = {{2025}},
}