Abstract
Deformation twins in thin foils of deformed polycrystalline α-Zr are observed along [1210] viewing direction, by High Resolution Electron Microscopy (HREM). The elements of the twinning mode are K l =(1012) and η l =[1011]. The interface consists of steps separating perfect and defected segments. The perfect areas present a corrugated structure of the boundary plane, while the defected areas have dislocation character associated with steps of various heights. The shorter step corresponds to the so-called b 2/2 twinning dislocation. Computed models of the relaxed structures of both, the perfect boundary and the b 2/2 twinning dislocation, are constructed using many-body potential calculations based on two different potentials. The resulting atomic positions are utilised for simulations of the HREM images. These images are compared with the experimental ones. The results show that one of the potentials used leads to a better image matching for the observed perfect twin boundary.
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