Dislocation Damping at High Temperatures

An unpinned dislocation damping model (based on the Mott-Nabarro solution hardening theory) was previously used to explain internal friction at room temperature and is now extended into the high-temperature range. With the model it is possible to explain the high-temperature internal friction which has been observed in the kilocycle frequency range for measurements made at very low strain amplitudes. In addition, the damping due to dislocation climb is considered.