CURRENT AND OLD PROBLEMS OF ION IRRADIATION-ENHANCED DIFFUSION IN METALS

The fraction of freely migrating defects during heavy ion irradiation of nickel has been estimated earlier from measurements of both self-di ffusion and swelling rates. The two data bases lead to significantly d ifferent fractions. Possible reasons for the deviation are sketched. A new experimental approach for self-diffusion measurements is describe d and first results are reported which essentially cancel the earlier deviation. At the same time the data give new information on the effec tive sink strength.