Abstract
Results are presented of studies of single crystal and polycrystalline aluminium oxide after neutron irradiation to doses up to 5 × 10 20 nvt (> 1 MeV). The macroscopic and X-ray growth were found to be equal both during irradiation and during post-irradiation annealing. On the basis of thin film electron microscopy, reciprocal lattice photography and the growth measurements, some conclusions are drawn as to the nature of the defect structure. It is shown that the post-irradiation annealing and the effect of irradiation temperature can be described quantitatively by an annealing process with a spectrum of activation energies. Optical metallography and some limited mechanical property measurements showed no evidence for deterioration of the properties of polycrystalline material and it is concluded that irradiation damage should not place serious limitations on the use of aluminium oxide in a reactor environment.
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