Atomic dislocation core parameters
- Author(s)
- Gunther Schöck
- Abstract
The classical expression for the elastic self-stress and the elastic self-energy of dislocation loops in a linear elastic continuum by line integrals show singularities and require a cut-off distance along the dislocation line. Somewhat different singularities exist in the core region of straight dislocation lines and require a cut-off radius r0 perpendicular to the dislocation line. These singularities can be avoided when the singular Volterra dislocation line is replaced by a distribution of infinitesimal dislocations. The width of this distribution and the core energy EA cannot be derived from continuum theory but depends on the atomic arrangement in the crystal lattice. It is shown that by using the Peierls model and the concept of Peierls dislocations the values of r0 and EA can be calculated for the different materials and physically realistic values for the cut-off parameters can be obtained.
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- Universität Wien
- Journal
- Physica Status Solidi. B: Basic Research
- Volume
- 247
- Pages
- 265-268
- No. of pages
- 4
- ISSN
- 0370-1972
- DOI
- https://doi.org/10.1002/pssb.200945379
- Publication date
- 2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/atomic-dislocation-core-parameters(8980a5dc-6a4d-4622-a1f7-aec485471027).html