Vibration modes of split screw dislocations in b.c.c. metals

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Abstract
Internal vibrations of the core of a crew dislocation in a b.c.c. lattice are studied using a simplified model of dislocation splitting on three planes into four partials. While the eigenfrequency of the optical mode is very high, of the order of 1012 s−1, the eigenfrequency of the acoustic mode strongly decreases with decreasing Burgers vector of the central partial. It is proposed that the acoustic mode can be detected from internal friction measurements or from the influence of ultrasound on the yield point of b.c.c. metals at low temperatures.
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