On the Motion of the a/2 <111> Screw Dislocation in Alpha Iron.
Abstract
The atomic configuration of a microkink along a a/2 <111> screw dislocation in alpha-iron is described. The core in the kink is 2 to 3 Burgers vectors wide and 4 to 5 Burgers vectors long. The energy of the kink is 0.08 eV and the atomic positions in the core are not very sensitive to the size of the model and to the choice of interatomic force law. It is shown that infinitely long straight dislocations move only under Peierls stresses considerably larger than expected experimentally. Kinked dislocations on the other hand move under more reasonable stresses. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1971
- Accession Number
- AD0731401
Entities
People
- P. C. Gehlen
Organizations
- Battelle Memorial Institute