High-temperature isothermal internal friction of copper and copper-aluminium solid solutions between 10-4 and 10 Hz

Copper and copper-aluminium solutions have been studied by means of high-temperature isothermal internal friction experiments performed between 10-4 and 10 Hz, in the temperature range 370-680°C. An enlarged internal friction peak superimposed on an exponential low-frequency background has been observed in each case. Such damping peaks are attributed to dislocation motion inside the grains. Activation energies are deduced from the peak position shifts as a function of the temperature. Possible rate-limiting mechanisms are suggested and discussed.