Interaction between interstitial atoms and 1/2 < 111 > (110) edge dislocations, and its influence on the Peierls stress
The positions of the metal atoms around a /sup 1///sub 2/(111) (110) edge dislocation in Mo and W are calculated using the Wilson-Johnson potentials. The boundary conditions are given by anisotropic elasticity theory. After the lattices have been relaxed the potential energy of a He atom was calculated for a grid of positions within a block around the dislocation core, which extends over six planes in the (112) direction. The He-metal potential, also developed by Johnson and Wilson was used to calculate the position with maximum energy gain for a He atom. The binding energies of the He atom in the dislocated lattice for Mo and W were 1.55 eV and 1.53 eV, respectively. The second part of the investigation concerns the Peierls stresses for a /sup 1///sub 2/(111) (110) edge dislocation in ..cap alpha..-Fe, with and without a carbon atom. The Peierls energy and stress are calculated for this slip-system based on the method originally used by Nabarro. The Peierls stresses (at zero absolute temperature) for the lattice with and without a carbon atom, are 0.006 ..mu.. and 0.009 ..mu.., respectively. These calculations were carried out utilizing the Wilson-Johnson potential for the Fe-Fe interaction and the Johnson potential was used for the Fe-C interaction.
- Research Organization:
- Laboratorium voor Fysische Metaalkunde, Groningen, Netherlands
- OSTI ID:
- 7343429
- Journal Information:
- Nucl. Metall.; (United States), Vol. 20; Conference: Conference on computer simulation for materials applications, Gaithersburg, MD, USA, 19 Apr 1976; Other Information: See CONF-760421--P1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EDGE DISLOCATIONS
COMPUTER CALCULATIONS
IRON-ALPHA
MOLYBDENUM
TUNGSTEN
CRYSTAL LATTICES
INTERATOMIC FORCES
INTERSTITIALS
PEIERLS-NABARRO FORCE
STRESSES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELEMENTS
IRON
LINE DEFECTS
METALS
POINT DEFECTS
REFRACTORY METALS
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies