Abstract
A relationship between dislocation internal friction microplastic and macroplastic behaviour of crystals has been considered. Main attention has been paid to the shape of the dislocation hysteresis responsible for the amplitude-dependent internal friction (ADIF) and to a comparison between the macroyield stress σ C and microyield stress σ∈ evaluated from the ADIF. It is shown that the same functional form of the ADIF curve may be due to different types of the dislocation hysteresis loop. A proportionality (similarity law) between the temperature dependences σ c (T) and σ e (T) has been demonstrated. Deviations from the similarity law can be used for analysis of the low and high temperature anomalies of σ c (T). The thermal vibrations of atoms rather than the thermal fluctuations are concluded to be responsible for the yield stress temperature dependence.
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