Void Evolution in α-Al2O3 Irradiated by En≥1 MeV Neutrons of 3 × 10 20 cm-2

摘要

The void evolution in α-Al2O3 irradiated by En ≥ 1MeV neutrons of 3× 10 20 cm-2 and post-annealed from 100℃ to 1050℃ has been studied by a positron annihilation lifetime technique. The void nucleation starts at 500℃ .In the annealing temperature region from 550℃ to 750℃, the radius of created voids keeps constant at a valueof about 0.29nm and the number of voids increases with increasing temperature. Afterwards, the radius of voidsincreases rapidly with the increasing annealing temperature and reaches 1.21 nm at 1050℃ .