Abstract
Voids occur in solids exposed to high-temperature particle irradiation. In hexagonal metals with lattice-parameter ratiosc/a which are smaller than for ideal close-packing, voids arranged in layers parallel to the basal plane have been observed after high-dose irradiation, whereas more perfect void ordering, e.g. the formation of void lattices like in cubic metals, has not been found. In this paper it is shown that it is the two-dimensional diffusion of self-interstitial atoms in the basal plane which gives rise to the layer-type arrangement of voids. The possibility of other void-ordering phenomena in hexagonal metals is investigated. It is demonstrated that, under certain circumstances, one-dimensional diffusion of a metastable self-interstitial configuration may lead to the arrangement of voids in columns perpendicular to the basal plane.
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