Influence of isothermal and cyclic annealing on structure and swelling of neutron-irradiated beryllium

The influence of cyclic and isothermal annealing on structure and swelling of neutron-irradiated beryllium was examined. At cyclic annealing the base temperature was equal to 150°C, the maximum cycle temperature was 600°C (700°C in the second experimental set), the number of heating-cooling cycles was from 10 to 100. Isothermal annealing of beryllium was performed at 600°C, 700°C and 800°C. The annealing time in the isothermal regime was the same as well as the total annealing time of beryllium samples at appropriate temperatures in the cyclic regime. It was shown that there are no significant differences in the influence of cyclic and isothermal annealing on structure and swelling of irradiated beryllium.