Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-77-C8-80
Zener Relaxation in Al-Li Binary AlloysJ. I. Pérez-Landazábal1, M.L. Nó2 and J. San Juan1
1 Dpto. Física Materia Condensada, Fac. Ciencias U.P.V., Apdo. 644, 48080 Bilbao, Spain
2 Dpto. Física Aplicada II, Fac. Ciencias U.P.V., Apdo. 644, 48080 Bilbao, Spain
Internal fiction (I.F.) and modulus measurements have been carried out as a function of temperature in order to study the Li mobility in an Al - 8.1 at% Li - 0.03 at% Zr alloy. The results show that the sequence of δ' and δ precipitation can be followed through the evolution of the internal friction spectra. Two peaks appear in the internal friction spectrum. The low temperature peak Pz (450 K), has associated a dynamic modulus defect, an activation energy of 1.2 eV and the width of a Debye peak. The analysis of the behaviour of this relaxation allows us to identify the Pz peak with the Zener relaxation process. The relaxation parameters lead us to determine the activation energy and the diffusion coefficient of Li in Aluminium.
© EDP Sciences 1996