The interaction of point defects with dislocations in high purity copper above room temperature

Damping and modulus measurements were made on high-purity, polycrystalline copper during and following 1.0 MeV electron irradiations in the temperature range, 37 to 5000C. Above a critical temperature (2250C) the pinning rate decreases. An analysis of the pinning rate data gives a value of 0.25 eV for the binding energy of a vacancy to a dislocation. An initial increase in the decrement, at the onset of irradiation, was observed at temperatures as high as 3750C. (author)