Numéro
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
Page(s) C5-407 - C5-419
DOI https://doi.org/10.1051/jphyscol:1981561
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. Colloques 42 (1981) C5-407-C5-419

DOI: 10.1051/jphyscol:1981561

EXPERIMENTAL AND THEORETICAL ASPECT OF THE HIGH TEMPERATURE DAMPING OF PURE METALS

J. Woirgard, A. Riviere et J. De Fouquet

Laboratoire de Mécanique et de Physique des Matériaux, E.R.A. CNRS n° 123, 86034 Poitiers, France


Abstract
It is shown that high temperature damping spectra in pure metals can be analysed in true relaxation peaks, located between 0.4 and 0.7 Tm, and large non linear effects giving internal friction maxima in the same temperature range. A number of experiments relating with single crystals indicate that damping originates mainly from lattice dislocation motions and not, as previously assumed, from grain boundary sliding. It is also shown that anelasticity seems to be due to long range interactions between dislocations or between dislocations and boundaries or sub-boundaries rather than to the influence of the line tension of the bowing out segments.