The influence of jogs on the extension of dislocation nodes

Abstract

The general geometry of extended symmetric and unsymmetric, P-type and K-type, nodes is discussed. It is shown that when jogs are close to dislocation nodes in low-SFE (stacking fault energy) materials they may constrict the node or may themselves become extended, depending on the character of the Shockley partial dislocations at the node. The presence of jogs at a K-type node is shown to result in the complete contraction of the node when other, similar nodes are extended in the same material. The effect of this interaction between jogs and nodes is discussed in relation to observations on the ability of jogs to climb, and the ability of jogs or nodes to glide.