ENHANCED DIFFUSION DUE TO ELECTRONS PROTONS AND QUENCHING
Results of investigations of radiation enhanced diffusion in copper 30% zinc 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 3times10"-12" dpa.s"-1" to 1.2times10"-8" dpa.s"-1", i.e. the migration activation energy of interstitials decreases for this dpa.s"-1" range from EM"1I" = 0.70 eV to EM"1I" = 0.52 eV. Results of electron irradiations obtained for 0.050 and 0.20 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. A value of 95 eV was determined for the activation energy of the ordering rate after quenching from 250circC in water. This was attributed to the migration activation energy of vacancies.
Bibliographic Reference: EUR 11347 EN (1987) MF, PP 22, BFR 150, BLOW-UP COPY, BFR 200, AVAILABILITY: CEC-LUXEMBOURG, BP 1003, GDL
Availability: Can be ordered online
Record Number: 1989126073200 / Last updated on: 1989-05-01
Available languages: en