Abstract
The effects of neutron and gamma irradiation on the height and temperature of the dislocation relaxation peak (Bordoni peak) have been studied in four very high purity copper single crystals having the orientation 〈110〉. Two crystals have width to length ratio 1:10 and the other two 1.3:1. Samples with different width to length ratio were used so that different dislocation loop lengths could be achieved by initial prestrains. In all samples the peak height and the peak temperature were reduced by irradiation. The samples with width to length ratio 1:10 exhibited a larger peak, due to the longer loops created in them. Gamma irradiation was found to have more effect on the characteristics of the peak than neutron irradiation. The results were in full agreement with the kink pair generation model.
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