Dislocation core field. II. Screw dislocation in iron

Details Dislocation core field. II. Screw dislocation in iron Dislocation core field. II. Screw dislocation in iron

2011-12-21

arxiv.org/abs/1112.4936v1

Physical Review B 84, 22 (2011) 224107

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.84.224107

The dislocation core field, which comes in addition to the Volterra elastic field, is studied for the <111> screw dislocation in alpha-iron. This core field, evidenced and characterized using ab initio calculations, corresponds to a biaxial dilatation, which we modeled within the anisotropic linear elasticity. We show that this core field needs to be considered when extracting quantitative information from atomistic simulations, such as dislocation core energies. Finally, we look at how dislocation properties are modified by this core field, by studying the interaction between two dislocations composing a dipole, as well as the interaction of a screw dislocation with a carbon atom.

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