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• W2043841790 abstract "The nucleation of extended dislocations from the grain boundaries in nanocrystalline aluminum is studied by molecular-dynamics simulation. The length of the stacking fault connecting the two Shockley partials that form the extended dislocation, i.e., the dislocation splitting distance, rsplit, depends not only on the stacking-fault energy but also on the resolved nucleation stress. Our simulations for columnar grain microstructures with a grain diameter, d, of up to 70 nm reveal that the magnitude of rsplit relative to d represents a critical length scale controlling the low-temperature mechanical behavior of nanocrystalline materials. For rsplit>d, the first partials nucleated from the boundaries glide across the grains and become incorporated into the boundaries on the opposite side, leaving behind a grain transected by a stacking fault. By contrast, for rsplit<d two Shockley partials connected by a stacking fault are emitted consecutively from the boundary, leading to a deformation microstructure similar to that of coarse-grained aluminum. The mechanical properties of nanocrystalline materials, such as the yield stress, therefore depend critically on the grain size." @default.
• W2043841790 created "2016-06-24" @default.
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• W2043841790 date "2001-08-01" @default.
• W2043841790 modified "2023-10-18" @default.
• W2043841790 title "Length-scale effects in the nucleation of extended dislocations in nanocrystalline Al by molecular-dynamics simulation" @default.
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• W2043841790 doi "https://doi.org/10.1016/s1359-6454(01)00167-7" @default.
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