Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-219-C8-222
Internal Friction Peak in Cold-Worked "Pure" Aluminum and Aluminum AlloysX.S. Guan1, H. Numakura2 and M. Koiwa1
1 Department of Materials Science and Engineering, Kyoto University, Kyoto 606-01, Japan
2 LMPM-ENSMA, Site du Futuroscope, Chasseneuil du Poitou, BP. 109, 86960 Futuroscope cedex, France
Low frequency internal friction measurements have been made on "pure" aluminum and dilute aluminum alloys in heavily cold-worked states. A relaxation peak is observed at about 200 K(for 1Hz) even in specimens of nominally 4N or higher purity. This peak is considered to be the same as those previously reported by several researchers for dilute aluminum alloys of Cu, Mg or Ga. Among various elements so far examined (Cu, Si, Fe, Ge, Mg), Si has a dominant effect. The anomalous features of the peak, i.e. high activation energy and small pre-exponential factor for the relaxation time can be understood in terms of a model in which the anelastic elements exhibit strong interaction.
© EDP Sciences 1996