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Vibration modes of split screw dislocations in b.c.c. metals
Author(s) -
Kroupa F.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220840238
Subject(s) - burgers vector , vibration , materials science , dislocation , lattice (music) , normal mode , crystallography , condensed matter physics , acoustics , physics , composite material , chemistry
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 10 12 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.