Abstract
Specimens of pure copper (oxygen-free high-conductivity grade) were irradiated with fission neutrons and 600 MeV protons. Fission neutron irradiations were carried out at 523 K in a temperature-controlled rig to fluences of ~ 5 × 10 23 and ~ 1.5 × 10 24 n/m 2 ( E > 1 MeV), corresponding to displacement doses of ~ 0.1 and 0.3 dpa, respectively. Irradiations with 600 MeV protons were carried out at 623 and 673 K to a dose level of ~ 0.5 dpa. Specimens irradiated with neutrons as well as protons were investigated by transmission electron microscopy (TEM). Quantitative determinations were made of defect clusters and cavities formed during irradiation. In the neutronirradiated copper, the swelling is found to be significantly enhanced in a relatively wide zone immediately adjacent to grain boundaries. TEM results demonstrate that the damage accumulation in copper irradiated with 600 MeV protons is significantly different from that observed in copper irradiated with fission neutrons. The implications of these results are discussed.
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