Stress-dependent dislocation core structures leading to non-Schmid behavior

Figures & data

Figure 1. Disregistry and density of Burgers vectors of screw and edge dislocations (a,b) in the principal direction (parallel to Burgers vector) without applied stress, (c,d) in the principal direction under 60 MPa shear stress with $\alpha ={270}^{\circ }$, (e,f) in the minor direction (perpendicular to Burgers vector) under 60 MPa shear stress with $\alpha ={270}^{\circ }.$

Figure 2. Core widths (in the unit of $a_0$) of (a) screw dislocation and (b) edge dislocation under 20 and 60 MPa in a function of applied shear directions ($\alpha =0\sim {360}^{\circ }$).

Figure 3. Comparison between the predicted core width using MPF, anisotropic elasticity (AE), and corrected anisotropic elasticity (cAE) approaches for (a) screw and (b) edge dislocation.

Figure 4. Relative magnitude of Peierls stresses as a function of applied shear stress in reversed directions: (a) $\alpha ={90}^{\circ }$ and (b) $\alpha ={270}^{\circ }$.