The two following videos were made with the help of aline/boundary3D using a suitable time-averaged potential energy window to visualize only the atoms in the dislocation cores. The system is a fcc cubic sample of Lennard-Jones atoms, with edges aligned along the principal directions [100], [010], and [001]. The video shows the time evolution of an edge dislocation, initially prepared along the [110] direction by displacing atoms according to the standard formulae of elasticity theory, while it splits into two partials, which move away from each other and reach the boundaries of the sample, as a consequence of their mutual repulsive actions. A stacking fault remains after the passage of the partials, which is visible thanks to its intersection with the boundaries of the cube, forming a regular hexagon. The splitting process of the partial is associated to the following reaction,
(1/2)[1,1,0] -> (1/6)[2,1,1] + (1/6)[1,2,-1].