Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 400, Issue -, Pages 45-48Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2005.03.089
Keywords
atomic-scale modelling; dislocation core; extended dislocation; stacking fault; Peierls stress
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Atomic-scale simulations of edge dislocations of the 1/3 < 1 1 (2) over bar 0 > (0 0 0 1) and 1/3 < 1 1 (2) over bar 0 > {1 (1) over bar 0 0} slip systems have been carried out using a Finnis-Sinclair-type interatomic potential for a-zirconium. The distribution of atomic displacements in the dislocation core shows that in this model the edge dislocation in the basal plane dissociates into two Shockley partials whereas the dislocation in the prism plane remains undissociated. The effective core radius and core energy are estimated, and dislocation response to increasing applied shear strain is investigated. The core properties and the critical stress for dislocation glide (Peierls stress) depend sensitively on whether the core extends or not. (c) 2005 Elsevier B.V. All rights reserved.
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