J. Phys. Colloques
Volume 48, Numéro C8, Décembre 1987Fifth European Conference on Internal Friction and Ultrasonic Attenuation in Solids
|Page(s)||C8-137 - C8-142|
J. Phys. Colloques 48 (1987) C8-137-C8-142
IMPURITY EFFECTS ON THE RECOVERY OF COPPER STUDIED BY ULTRASONIC ATTENUATION MEASUREMENTS UNDER CYCLIC BIAS STRESSC. BECKER, D. LENZ et K. LÜCKE
Institut für Allgemeine Metallkunde und Metallphysik der RWTH, D-5100 Aachen, F.R.G.
High purity Cu single crystals doped with Mg, Ag, Pb, Sb, Bi (20-50 ppm) were isochronally annealed between 373 K and 923 K after 0.12% deformation at room temperature. After each annealing step the dependence of sound attenuation on frequency (10 - 200 MHz) and bias stress (cyclic compression/tension ; peak amplitudes below plastic yield) was measured. From the latter experiment specific information on the solute diffusion towards the dislocations and their pinning strength is obtained. From the frequency dependence of attenuation the dislocation pinning point density and the recovery of dislocation density as a function of temperature and type of solute is derived.