The effect of deformation and forest dislocations density on the activation volume in zinc single crystals

The obstacle density in single Zn crystals calculated from the experimental values of the activation volume, an important parameter of the thermally activated glide of dislocations, is compared with the density of forest dislocations. The density of obstacles is about two or three orders higher than that of the forest dislocations. It is assumed that nonconservative jog motion is the rate-controlling mechanisms in Stage A, while in Stage B the activation volume is more directly determined by interaction with the forest dislocations.--AA