Low Frequency Internal Friction Due to Dislocations Oscillating in the Lattice

概要

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The amplitude-dependent internal friction which is due to dislocations oscil-Rating in the lattice is described in terms of dislocation mobility, under the con-dition that the motion of dislocation is limited by tension forces, as will be thecase at low frequencies. It is shown that the friction increases as the frequencyincreases and that it decreases as the amplitude i??creases. These results are incontrast to those obtained before for the internal friction at higlt frequencies,wherethe internal friction increases v,'ith the amplitude and has an inverse frequencydependence.Comparison with available data of low frequency internal fu"iction on copper anda-brass shows that the line-tension limited motion accounts for the observedresults.
1983-01-15