Abstract
A simple model of a screw dislocation with first neighbours interactions is presented. The interaction energy of atoms is a piece-wisely parabolic function of distortions. The equilibrium configurations of weak bonds as a function of the model parameter γ and the quasi-static motion of the dislocation are examined. Sessile and glissile configurations of weak bonds and symmetric and asymmetric equilibrium positions of the dislocation are found. The dependence of the Peierls stress on the model parameter γ is discussed.
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