Abstract
The first part of this paper reviews the atomistic model proposed for the equilibrium structure of grain boundaries in metals. These models are based on dislocation, coincidence, plane matching and polyhedral unit concepts. The basic ideas and shortcomings of the various concepts are discussed. The present understanding of the structure of dislocation and vacancies (non-equilibrium defects) in grain boundaries is summarized in the second part of the chapter. The existing evidence suggests that these defects have a similar structure in low energy grain boundaries as the analogous defects in the perfect lattice. However, in high energy boundaries, the defects may be smeared out (delocalized) in the plane of the boundary.
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