Swelling of Highly Neutron Irradiated Beryllium and Titanium Beryllide

Abstract

The swelling of beryllium and titanium beryllide after irradiation at 70–750 °C to neutron fluences of (0.25–8) · 1022 cm−2 (E > 1 MeV) was measured using methods of immersion, dimension, and helium pycnometry. Dependences of the swelling on the irradiation temperature and neutron dose were plotted and analyzed. The dose dependences show linear dependences of the swelling for all irradiation temperatures except 70 °C, where the swelling rate varies, depending on increasing neutron dose. Be-7Ti shows much less swelling than pure Be. Irradiation at 430–750 °C to neutron fluence of 1.82 · 1022 cm−2 (E > 1 MeV) leads to swelling of Be at about 50%; for Be-7Ti, it is 2.7%. The microstructure study shows that the formation of bubbles and pores in beryllium occurs much more intense than in titanium beryllide.

Tritium Desorption Behavior and Microstructure Evolution of Beryllium Irradiated at Low Temperature Up to High Neutron Dose in BR2 Reactor

“…When comparing the evolution of beryllium microstructure after low-temperature irradiation followed by high-temperature annealing to high-temperature irradiation, similar features were observed [33,34]. In both cases (T irr = 343-393 K with following annealing at 873-1473 K for 1 h and T irr = 686-968 K), the formation of large bubbles led to a sharp increase in swelling.…”