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Nonequilibrium configurations and peierls potential of screw dislocations in the b.c.c. lattice
Author(s) -
Heinrich R.,
Schellenberger W.
Publication year - 1971
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.2220470108
Subject(s) - peierls stress , condensed matter physics , dislocation , saddle , lattice (music) , non equilibrium thermodynamics , saddle point , equipotential surface , slip (aerodynamics) , physics , materials science , dislocation creep , geometry , quantum mechanics , thermodynamics , mathematics , acoustics , mathematical optimization
A model for the calculation of the Peierls potential of straight screw dislocations in the b.c.c. lattice is developed. The method takes into account the detailed atomic nonequilibrium structure of the dislocation. Those nonequilibrium configurations which play a leading part during the dislocation motion have been classified by two core‐structure parameters, which can be regarded as “generalized dislocation position”. The Peierls potential, i.e. the dislocation energy as a function of these parameters, has been calculated. The equipotential contours of the Peierls potential and the saddle‐point configurations of screw dislocations are presented, and several types of the dislocation motion are discussed. Further, the influence of external stress has been analyzed. It turns out that the macroscopic slip of screw dislocations is composed of elementary {110} slip processes.