4.5 Article

3D grain growth in nanocrystalline Al via molecular dynamics: Influence of size, and mean curvature on kinetics

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Summary: Grain boundary character distributions (GBCD) can be measured from microcrystalline samples using electron backscatter diffraction (EBSD) and can be used to reconstruct relative grain boundary energy distributions (GBED) based on the 3D geometry of triple lines, assuming the force balance condition is satisfied. However, for nanocrystalline thin films, the GBED cannot be extracted effectively using orientation mapping via precession enhanced electron diffraction (PED). In this study, the relative energy extraction technique was adapted to PED data and the results showed that the GBED extracted from these films do not correlate with energies calculated using molecular dynamics (MD) or with the experimentally determined GBCD. This suggests that additional geometric factors contribute to determining the triple junction geometry and boundary network structure in these films.

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