Abstract
Observations of faceting of high-angle 〈101̄0〉 tilt grain boundaries in zinc have been made in the misorientation range 3° < θ < 36.5°. A structural unit model of the atomic configurations in these low energy faceted boundaries has been developed which accurately describes the observed changes in facet inclination with boundary misorientation. Following the predictions of the model, faceting of 〈101̄0〉 tilt boundaries in zinc in the misorientation range 49.5° < θ < 55.2° was looked for and was found as anticipated. The predicted change in facet morphology with boundary misorientation was observed here also. The structural units in the model are taken to be short segments of 〈101̄0〉 coincidence or near-coincidence tilt boundaries which combine to form the asymmetric tilt boundaries making up the facets. Characteristics of the structural units and the manner in which they combine to produce low-energy atomic configurations are discussed.
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