On the Dislocation Properties of 60$^{\circ}$ Partial Dislocation in Silver: Core Structure and Peierls Stress

Abstract

Two-dimensional modified Peierls-Nabarro dislocation equation concern- ing the discreteness of crystals is reduced to one-dimensional equation to determined the core structure of partial dislocation in Ag. The generalized stacking fault energy along the Burgers vectors of partial dislocation is a skewed sinusoidal force law, which is related to the intrinsic stacking fault energy and the unstable stacking fault energy. A trial solution appropriate for arbitrary dislocation angle is presented within the vari- ational method. The results show that the half core width increases as the increase of dislocation angle. Moreover, the core width decreases with the increase of the unsta- ble stacking fault energy and the intrinsic stacking fault energy. Peierls stress for 60 - partial dislocation is in agreement with the experimental results. PACS: 61.72.Bb, 61.72.Lk, 61.72.Nn