Comparison of dislocation pinning effects in copper with existing theories

Abstract The variations of modulus and damping in copper were measured in the kHz range during electron irradiation at temperatures between 9 and 160 K. The results are compared with both Granato—Lucke and Simpson—Sosin models for dislocation damping. The results are in good agreement with the Grenato—Lucke theory at low strain amplitude. A ‘peak’ in the damping as a function of irradiation time appears at higher strain amplitude and the defect dragging mechanism proposed by Simpson and Sosin can explain this observation.