Figure 4
From: Local decomposition induced by dislocation motions inside precipitates in an Al-alloy

(a) Schematic of the computational cell used for MD simulations. The dislocation is indicated with “⊥”; and the stacking fault area (in the left of the core) is also marked. (b) Cell for MD simulation, where partial dislocation is involved. (c–e) Snapshots of the atomic configuration at 14,000, 200,000 and 400,000 timesteps, respectively. In (b–e), the green spheres denote Al and the brown spheres Cu atoms, respectively. (f) Atomistic configurations projected along direction where perfect area, partial core and stacking fault are represented. (g) and (h) show a continuous motion of dislocation leaves behind Cu displacements (red-arrowed) around the slip plane. (i–m) MD simulation indicates that the two partials tend to move toward each other (see the length changing of the double-arrowed bars in the figure). Colored according to the displacement values (
), the plots display an evolution of Cu displacement at 6,000, 10,000, 16,000, 30,000 and 240,000 timesteps, respectively. In (i–l), the displacement values are from 0 to 1 Å; while in (M) the range is 0~7Å. The additional peaks between the two partials in (j, k, l) are believed to result from the local distortion under stress in the stacking fault area.