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Deformation twinning in metal is normally a permanent plastic deformation mechanism. In this study, deformation twining and detwinning were observed at a crack tip by in-situ transmission electron microscope and the post fracture surface characterization for the lamella copper. At deformation twinning process, the larger twins grew at expense of the smaller twins adjacent to them via the partial dislocations...
Deformation twinning was observed in ultra-fine grained Ni at room temperature and low strain rate (1×10 −5 /s) in uniaxial tensile deformation, and especially observed in a single Ni wire. In this study, the grain boundary migration and deformation twins were confirmed by in-situ transmission electron microscopy and the post-fracture surface characterizations for ultra-fine grained Ni, indicating...
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