Fig. 13 Lang topograph of a silicon crystal showing dislocations, including a Frank-Read source and thickness fringes. Source: Ref 20 More

Fig. 23 Bright-field image of polycrystalline aluminum showing dislocations as they often appear in metallic crystals. The dislocations appear as dark curved lines and exhibit dark contrast relative to the matrix due to the distortion of the atomic planes near the dislocations More

Fig. 58 Elastic displacement field associated with dislocations. (a) An edge dislocation at which the perfect part of the crystal is oriented far from the Bragg angle. (b) The transmitted intensity, I t , as a function of depth, z , below the entrance surface of the thin crystal More

Fig. 14 Dense tangles of dislocations forming a cell structure in iron that was deformed at room temperature to 9% strain (a) and to 20% strain (b). Note that the average spacing between cell walls decreased as strain was increased. Thin-foil electron micrographs. Original magnification 20,000× More

Fig. 10 (a) Geometry of a row of edge dislocations, causing a misorientation between the two sections of the crystal. (b) Polished and etched surface of a germanium crystal revealing a subboundary by the row of etch pits associated with the dislocation cores. Reprinted from Ref 7 . Source More

Fig. 22 (a) X dislocation sources per unit volume emit dislocations over a radius L . Continued emission (and hence strain) requires that the outermost dislocations in each loop be annihilated by climb processes between nearby loops separated by the distance h . (b) A two-dimensional view More

Fig. 1 Slip and dislocations. (a) Ideal crystal. (b) Plastic deformation by slip in an ideal crystal from shear stress (τ) More

Fig. 10 Schematic representation of a cross slip process of several dislocations at an obstable (X), if (a) planar slip or (b) wavy slip prevails. Source: Ref 24 More

Fig. 2 Dislocations, which have “knitted” themselves into small-angle subboundaries, in a specimen of unalloyed nickel that was cold rolled to a reduction of 8% and then annealed for 2 h at 600 °C (1110 °F). Thin-foil transmission electron microscopy specimen. Original magnification: 10,000× More

Fig. 22 (a) X dislocation sources per unit volume emit dislocations over a radius L . Continued emission (and hence strain) requires that the outermost dislocations in each loop be annihilated by climb processes between nearby loops separated by the distance h . (b) A two-dimensional view More

Fig. 12 (a) Ashby and (b) Orowan models for interaction of dislocations with coherent and incoherent precipitates More

Fig. 7 Schematic illustration of a total dislocation and its partial dislocations More

Fig. 10 Effect of dislocations introduced by cold working and removed by annealing on width of diffraction peaks in brass. Source: Ref 1 More

Fig. 18 Transmission electron microscopy imaging of dislocations in aluminum. Source: Ref 3 More

Fig. 5 (a) Synchrotron transmission topograph of superscrew dislocations in 6H-SiC ( g = 0006). (b) Simulation of pure orientation contrast of a 5 c superscrew dislocation More

Fig. 43 Coordinated scanning electron microscope analysis of threading dislocations in a GaN (0002) single crystal using (a) electron channeling contrast imaging and (b) cathodoluminescence. Reprinted from Ref 59 with permission of Cambridge University Press More

Fig. 11 Critical condition for barrier-less nucleation of slip dislocations in stress field of plate periphery. Source: Ref 56 More

Fig. 13 Flow chart schematically illustrating the behavior of dislocations produced by strain hardening during continuous dynamic recrystallization (hatched arrows), the continuous increase of low-angle boundary (LAB) misorientations (gray arrows), and the absorption of dislocations More

Fig. 10 Dislocations (shown as the boundaries between slipped and unslipped regions) in the γ/γ′ microstructure of −0.3% lattice misfit under 152 MPa [001] tensile stress. Cross-sectional view on the slip plane for (b) 1 / 2 [ 101 ] ( 1 ¯ 1 ¯ 1 ) dislocations More

Fig. 12 Discrete dislocations and a continuum field of the inelastic (plastic) strain field (dotted and shadowed regions) that yields the same plastic deformation at a coarse-grained length scale (much greater than dislocation core size). (Model output images are in color.) More