Dislocation substructure in zirconium alloys irradiated in EBR-II
The dislocation microstructures of annealed Zircaloy-2, cold-worked Zr-2.5 wt% Nb and extruded Excel (Zr-3.5 wt% Sn-0.8 wt% Nb-0.8 wt% Mo) neutron irradiated in EBR-II at 670 to 690 K to fluences of 1.7 to 6.3 x 10/sup 25/ n/m/sup 2/ (E>1 MeV) and also of cold-worked Zr-2.5 wt% Nb irradiated to 1.2 x 10/sup 25/ n/m/sup 2/ (E>1 MeV) at 550 K in Unit 4 of Pickering Nuclear Generating Station are reported. The irradiation damage produced in zirconium alloys by fast neutron irradiation in EBR-II at 657 to 675 K consists of type dislocation loops and, in annealed Zircaloy, component dislocations. Both type and component dislocations survive fast neutron irradiation to relatively high fluences (5.5 x 10/sup 25/ n/m/sup 2/ at 657 K). Cold-worked Zr-2.5 wt% Nb irradiated in Pickering-4 to 1.2 x 10/sup 25/ n/m/sup 2/ at 550 K contains fine type loops and residual component dislocations from cold-work. All zirconium alloys exhibiting high (non-saturating) irradiation growth rates contain type dislocations and type loops. The presence of component dislocations is also inferred. This suggests a modified model of irradiation growth in which vacancies segregate to component dislocations or faulted loops and interstitials to type loops.
- Research Organization:
- Atomic Energy of Canada Ltd., Chalk River, Ontario
- OSTI ID:
- 5696238
- Journal Information:
- Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States), Journal Name: Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States) Vol. 782; ISSN ASTTA
- Country of Publication:
- United States
- Language:
- English
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Non-linear irradiation growth of cold-worked Zircaloy-2
Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
ANNEALING
BARYONS
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
COLD WORKING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
EXTRUSION
FABRICATION
FAST NEUTRONS
FERMIONS
HADRONS
HEAT TREATMENTS
INFORMATION
IRON ADDITIONS
IRON ALLOYS
LINE DEFECTS
MATERIALS WORKING
MICROSCOPY
MOLYBDENUM ALLOYS
NEUTRONS
NIOBIUM ALLOYS
NUCLEONS
NUMERICAL DATA
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
TIN ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
ZIRCALOY
ZIRCALOY 2
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS