Radiation enhanced diffusion due to electrons and protons

Results of investigations of radiation enhanced diffusion in Cu-30% Zn alloys using 17.65 MeV protons are reported and compared with results obtained for 2 MeV electrons. The activation energy of diffusion decreases considerably from 0.35 eV to 0.26 eV for displacement rates increasing from 3x10-12 dpa s-1 to 1.2x10-8 dpa s-1, i.e. the migration activation energy of interstitials decreases for this dpa s-1 range from EM1I = 0.70 eV to EM1I = 0.52 eV. Results of electron irradiations obtained for 0.050 mm and 0.10 mm thick specimens are compared. It is found that the diffusion rates increase considerably in the presence of dislocations and that the diffusion rates decrease for very low electron fluxes and high irradiation temperatures in the 0.050 mm thick specimens in comparison to the rates obtained in 0.10 mm thick specimens. (orig.)