Abstract
The structure of a near-coherent twin boundary in a Au bicrystal was investigated using transmission electron microscopy. Upon annealing the bicrystal, a low angle boundary and a parallel coherent twin boundary merged to form a near-coherent twin boundary with a deviation of 0.45° from the exact twin orientation. In the near-coherent twin boundary a dislocation network has been observed with a characteristic six-star pattern, while in some small areas the network has a triangular shape which is closely related to the six-star pattern. In an effort to reproduce these patterns in a computer simulation study, the atomic configurations in (111) twist boundaries close to the twin orientation were calculated (Σ37, Σ61, Σ91, Σ127, Σ169). For a given twist boundary and interatomic potential both six-star and triangular patterns were obtained. The triangular structure appeared to be energetically much more favourable, independent of the various interatomic potentials employed.
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