Abstract
The effect of the heat treatment on the attenuation and velocity of sound waves of different types, measured at frequencies ∼ 15 Hz, 100 kHz and 5 MHz, has been studied in submicrocrystalline copper of different purity. The samples with grain size of 0.2 μm were obtained by equichannel angular pressing method. A drastic irreversible increase of velocity values after annealings above some characteristic temperature T 0 was observed. T 0, according to electron microscopy studies, coincided with the temperature of primary recrystallization. The temperature dependences of sound velocity and internal friction in as-prepared samples display the internal friction peak and corresponding sound velocity jump near T 0, the peak temperature being independent of frequency. The results obtained are considered in terms of models which describe the influence of structure defects on the elastic and dissipative properties of crystals.
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