Abstract
The formation of a fivefold deformation twin in nanocrystalline Al is studied by the quasicontinuum method. The study focuses on the microstructural effect on the formation process. A particular low-index grain boundary, which has been investigated in a bicrystal model, is observed in the sample. The dislocation reflection and inhomogeneous stress distribution caused by this grain boundary are discussed. The importance of this microstructure to the formation of a fivefold deformation twin is manifested by the results.
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