面心立方結晶中の拡張転位と格子間原子の相互作用の計算機シュミレーション

概要

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A computer simulation of core structure and slip motion of a screw dislocation in F. C. C crysta1, especially in copper crystal, has been performed by using Finnis-Sinclair potential in a model lattice. Because of its structural stability of stacking fault on {111} plane, an extended screw dislocation was energetically favoured over a perfect screw dislocation. After introducing this extended screw dislocation into the model crystal, the aspect of the slip motion under applied shear stress was studied. Then we introduced a self-interstitial atom (SIA) in the crystal and investigated the interaction between the extended screw dislocation and a SIA under the shear stress. The elementary process of the interference mechanism for dislocation motion caused by a SIA was explained from the atomistic view point instead of the conventional string model.
1992-03-01