Interaction of 1/3?11 0?(0001) edge dislocation with point defect clusters created in displacement cascades in a-zirconium.
- University of Liverpool
- ORNL
Atomic-scale details of the interaction of a 1/3 11{bar 2}0 (0001) edge dislocation, which dissociates in the basal plane, with four typical vacancy and self-interstitial atom (SIA) clusters created by displacement cascades in a-zirconium are investigated by computer modelling. A triangular cluster of SIAs lying within a basal atomic plane adjacent to the dislocation glide plane is not absorbed by the dislocation but is pushed along by the leading partial. A 3-D SIA cluster lying across the glide plane is completely absorbed by the dislocation by creation of two super-jogs. The dislocation also climbs by interaction with a prismatic vacancy cluster, but only half of the vacancies are absorbed in this case. For a cluster formed from a basal platelet of vacancies, the dislocation experiences a glide resistance, but both the line and cluster are fully restored after breakaway. Stress-strain curves and the critical stress for dislocation breakaway from a cluster are presented.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 958744
- Journal Information:
- Materials Science and Engineering A, Vol. 400-401
- Country of Publication:
- United States
- Language:
- English
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