Abstract
Abstract 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.
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