Figure 3
From: Local decomposition induced by dislocation motions inside precipitates in an Al-alloy

(a) HREM image obtained from direction showing a dislocation array with a slip system [001](110). Burgers circuit is outlined for each dislocation, which exhibits the lattice displacement of 1/2[001] in this projection. (b) High magnification image of the partial dislocation (left partial in (A)). Stacking fault in the right of dislocation core (“⊥”) is not resolved since the atomic projections of (001) and 1/2(001) planes are the same. (c) Atomic structural model of the partials viewed along the dislocation line. Here, atoms in three sub-layers (x = 0, 0.096, 0.25) are selected for projection in order to distinguish the two cores. The partial changes the stacking of the crystal (vertical direction in this schematic representation), i.e. it either removes or creates a stacking fault. The whole configuration of two partials and stacking fault (an ellipsis between two cores are marked) is called an extended dislocation.