Fig. 1 Simulated dissociation of an dislocation [11?0]/2 array with θ = 90° in Ag, where the red atoms represent the b1=[12?1]]/6,the blue ones b2=[211?]/6 and the gray ones stacking fault zone. See the text for parameters

Fig. 2 Partial dislocations after dissociation of a screw dislocation array with θ = 0° in Ag. Both the differential displacements (arrows) and the γ-parameter distribution (color map) are superimposed on (11?0), where atoms are displayed with circles. The triads of arrows with a closed loop identify the position of the two partials, while the local extrema of the γ-parameter locate these core positions. The separations revealed by these two methods are indicated by dDD and dγ, respectively

Fig. 3 Variation of γe with D for edge dislocation arrays in Cu and Ag. Squares (solid line) and circles (dashed line) denote the simulation data (the prediction from Eq. (11) with wi) in Cu and Ag, respectively

Fig. 4 Variation of the scaled effective SFE γe/γ0 with η. Squares and circles denote the simulation results in Fig. 3. Diamonds and upper triangles represent the simulation results of screw dislocation arrays for Ag based on isotropic and anisotropic theory, respectively. Down triangles are the experimental results for a TWIP steel