J. Phys. Colloques
Volume 46, Numéro C10, Décembre 1985Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
|Page(s)||C10-309 - C10-312|
J. Phys. Colloques 46 (1985) C10-309-C10-312
THE ν PEAK IN DEFORMED HIGH-PURITY α-IRON STUDIED BY FORCED VIBRATIONS OUT OF RESONANCEH. MIZUBAYASHI1, H. KRONMÜLLER2 and A. SEEGER2
1 Institute of Materials Science, University of Tsukuba, Sakura-mura, Ibaraki 305, Japan
2 Max-Planck-Institut für Metallforschung, Institut für Physik, 7000 Stuttgart 80, F.R.G.
The γ peak in high-purity α-iron was investigated using frequencies over three decades, i.e. 7.4Hz, 0.015Hz and 0.007Hz. For 7.4Hz, the usual resonant vibration mode was used and for 0.015 or 0.007Hz, the forced vibration mode was applied. The observed values of the enthalpy, H, and of the pre-exponential factor, 1/τ0, of the γ peak both showed the tendency of increase with annealing after the low temperature small deformation, i.e. from 0.825eV and 4 . 0 x1013s-1 to 0.910eV and 1.2x1015s-1, respectively. From the amplitude dependence, 2Hk was estimated as about 0.940eV, where Hk denotes the enthalpy of an isolated single kink in screw-dislocations in α-iron.