Abstract
Field-ion microscopy is used to study changes in the structure of the grain boundaries induced by intergrain adsorption of point defects created by ion bombardment of tungsten bicrystals. It is found that irradiation at temperatures below the threshold of grain-boundary relaxation causes a local expansion of the boundaries. Computer simulation using molecular dynamics shows that intergrain adsorption of vacancies can lead to the formation of three-dimensional grain-boundary structures.
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