Elastic energy of a straight dislocation and contribution from core tractions

Details Elastic energy of a straight dislocation and contribution from core tractions Elastic energy of a straight dislocation and contribution from core tractions

2009-06-29

arxiv.org/abs/0906.5332v1

Philosophical Magazine 89, 19 (2009) 1565-1584

Physics

Condensed Matter

Materials Science

Scientific paper

10.1080/14786430902976794

We derive an expression of the core traction contribution to the dislocation elastic energy within linear anisotropic elasticity theory using the sextic formalism. With this contribution, the elastic energy is a state variable consistent with the work of the Peach-Koehler forces. This contribution needs also to be considered when extracting from atomic simulations core energies. The core energies thus obtained are real intrinsic dislocation properties: they do not depend on the presence and position of other defects. This is illustrated by calculating core energies of edge dislocation in bcc iron, where we show that dislocations gliding in {110} planes are more stable than those gliding in {112} planes.

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