PPT Slide
Aside from the shear stress associated with the glide of edge, screw, and mixed dislocations, it is possible for edge dislocations to produce tensile strains by moving in a direction perpendicular to the Burgers vector [Fig. 11-12(a)].
This type of motion is called dislocation climb and involves the transport of atoms (or vacancies) away from or to the dislocation (edge of the extra half plane) by diffusion.
Because dislocation climb is diffusion-controlled, it is important only at relatively high temperatures where the diffusion rates are fairly rapid.
Motion of an edge dislocation showing both glide and climb motion is illustrated in Fig. 11-12(b).