Abstract
The large and negative diaelastic changes of the two independent shear elastic constants of Cu have been measured as a function of Frenkel pair production over the concentration range from 1 to 5*10-4 during electron irradiation below 5K. The results are in excellent agreement with previously published values obtained at much smaller defect concentrations, and show that the (100) split interstitial is created in Cu over the concentration range from about 10-7 to 5*10-4. Application of a highly sensitive after-effect technique, capable of detecting changes in strain as small as 5*10-10, revealed no relaxation effect due to the migration and reorientation of these interstitials, such as has been found in Al. Differences in the clustering behaviour of Al and Cu are discussed which are consistent with this observation.
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