Abstract
Atomic relaxations in grain boundaries (GBs) can assume quasiperiodic character even in periodic GBs, as we show for a Σ = 41 GB in gold, which is analyzed by transmission-, high-resolution electron microscopy (HREM) and atomistic computer simulations. We find that misfit localization within a large planar GB unit cell can generate densely spaced regions of structural disorder, akin to misfit dislocations. The observations illustrate that atomic relaxations are typically dominated by short-range interactions and the tendency of the solid to assume a local atomic environment similar to the bulk.
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