Abstract
The internal friction of a face-centered metal such as copper, measured at low-strain amplitudes, can be divided into a low-frequency region and a high-frequency region. Available data show that, in the low-frequency range, the internal friction is nearly independent of the frequency. The internal friction and the modulus change, caused by neutron irradiation, can be analyzed to show that the low-frequency region is caused by a series of relaxation processes. In the high-frequency region, the internal friction increases in proportion to the frequency, and the modulus change is nonrelaxational in character. It is shown that the variation of this component over a temperature range is consistent with the variation of phonon viscosity and not consistent with phonon scattering or thermoelastic damping of dislocations.
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