Physics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...55..254g&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 55, Issue 3-4, p. 254-258.
Physics
27
Scientific paper
Internal friction (Q-1) experiments have been performed on synthetic forsterite single crystals in order to investigate the role of temperature, frequency and dislocation density on the Q-1 factor. Data have been obtained for both deformed and undeformed specimens over a frequency range from 10 to 10-4 Hz at 15, 1000, 1200 and 1400°C. Measurements were done using a torsional pendulum operating in forced oscillations on specimens with dimensions of 20 mm × 5 mm × 1 mm. Samples were maintained in vacuum. Stress amplitudes were 0.1 MPa and strains 10-6-10-5. Pre-deformation experiments were creep tests performed at 1600°C and 20 MPa. The amount of strain was 10-2. Dislocation microstructures were investigated by transmission electron microscopy.
At room temperature, undeformed samples show low attenuation with no frequency dependence. At high temperature (1400°C), Q-1 increases up to 5 × 10-2 for very low frequencies (10-4 Hz). Deformed specimens show the same trend but there is a more pronounced increase in Q-1 with both frequency and temperature (Q-1 = 2 × 10-1, 10-4 Hz at 1400°C). This high-temperature attenuation is the result of dislocation processes which are probably non-linear in the strain range explored by the present experiments (ɛ > 10-6). Non-linearity appears to be the best explanation for the disagreement between high Q-1 data reported in laboratory and low Q 1 data reported for the upper mantle.
Darot Michel
Gueguen Yves
Mazot P.
Woirgard J.
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