The variation in the ultrasonic attenuation as a function of time was measured during the tensile and compressive stressing of cold-worked or annealed polycrystalline 5N-purity material at room temperature. The results were explained in terms of the interaction between dislocations and point defects. It was found that the ultrasonic attenuation decreased when the dislocation moved into an atmosphere of point defects, whereas it increased when the dislocation moved away from the atmosphere of point defects.

G.T.Fei: Journal of Physics D, 1996, 29[11], 2938-41