Type

Journal Article

Authors

Alexander M. Korsunsky
Sinéad Keegan
Felix Hofmann

Subjects

Physics

Topics
experimental lattice analytical patterns computation loops evolution processing

Analytical computation of the lattice rotations induced by 3D dislocation loops (2010)

Abstract This paper presents the derivation of expressions for the lattice rotations induced by a triangular dislocation loop in an isotropic, elastic medium, based on the classical displacement field solution for a triangular dislocation loop. Using the simple example of a triangular dislocation loop with one segment of edge character, one segment of screw character and a mixed character segment, a comparison of the 3D lattice rotation fields with those predicted for straight, infinitely long 2D dislocations is made. Agreement is excellent. As an illustration of the utility of the rotation solution, the lattice rotations induced by a Frank-Read Source are studied at different stages during its evolution. The dislocation segment positions were computed using the discrete dislocation dynamics code ParaDiS. Post-processing of the lattice rotation maps in terms of lattice orientation spread reveals preferential lattice misorientation or streaking which is consistent with the single active slip system in the simulation. Streaking is a feature frequently observed in micro-diffraction measurements. The availability of the lattice rotation solution makes it possible to evaluate the lattice rotations arising from any 3D distribution of dislocation segments. This allows the computation of predicted diffraction patterns from computed dislocation substructures for direct comparison with experimental measurements. It also makes the inclusion of lattice rotations into 3D dislocation dynamics codes possible. This effect has thus far been treated as small, but was shown to be important in 2D dislocation dynamics simulations.
Collections Ireland -> DAIR -> Open Access DRIVERset
Ireland -> DAIR -> Type = Article
Ireland -> DAIR -> Status = Preprint

Full list of authors on original publication

Alexander M. Korsunsky, Sinéad Keegan, Felix Hofmann

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