Abstract
Transmission electron microscopy was used to investigate the formation of irradiation-induced defects in proton-irradiated high-purity aluminum. The specimens were irradiated by 800-MeV protons to about 0.25 displacements per atom (dpa) in the Los Alamos Meson Physics Facility (LAMPF), producing about 20 appm helium, 130 appm hydrogen, and approximately 70 appm of spallation products. The as-irradiated microstructure mainly consisted of cavities with a mean size of 88 A, number density of 1 × 10 15 cavities/cm 3, and volume fraction of about 0.05%. The swelling was comparable to that of high-purity aluminum samples neutron-irradiated to the same displacement level. However, the high production rate of gas atoms during the proton irradiation increased the cavity number density by an order of magnitude relative to neutron irradiation, and reduced the cavity size by a factor of about 3. A postirradiation annealing treatment at 250°C resulted in complete disappearance of the small cavities and formation of gas bubbles on grain boundaries.
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