Abstract
A simple model for explaining irradiation-growth of polycrystalline zirconium-base alloys has been developed by considering the operation of two point-defect sinks, namely the lattice dislocation network and the grain boundaries. The grain shape resulting from pre-irradiation mechanical treatments has been taken into account as well. This model predicts growth strains that are in good agreement with experimental data concerning cold-worked material. For annealed specimens, agreement with experimental strain rates is achieved at high doses only. The proposed (dislocation) model was next extended by incorporating the influence upon growth of irradiation-induced extrinsic dislocation loops. Again, agreement of experimental results on cold-worked material and this (loop) model may be obtained though calculated strains seem to be rather lower than the experimental ones, but it fails to explain the growth behavior of annealed specimens.
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