Dislocation substructure in zirconium alloys irradiated in EBR-II
We report 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. 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:
- 5709797
- Report Number(s):
- CONF-820628-
- 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
Similar Records
Damage stucture in zirconium alloys irradiated at 573 to 923/sup 0/K. [Neutron fluence 1 x 10/sup 25/ n. m/sup -2/]
Non-linear irradiation growth of cold-worked Zircaloy-2
Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
BARYONS
BREEDER REACTORS
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
EBR-2 REACTOR
ELEMENTARY PARTICLES
EPITHERMAL REACTORS
EXPERIMENTAL REACTORS
FAST NEUTRONS
FAST REACTORS
FBR TYPE REACTORS
FERMIONS
HADRONS
IRON ADDITIONS
IRON ALLOYS
LINE DEFECTS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MICROSTRUCTURE
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
NEUTRONS
NIOBIUM ALLOYS
NUCLEONS
PHYSICAL RADIATION EFFECTS
POWER REACTORS
RADIATION EFFECTS
REACTORS
RESEARCH AND TEST REACTORS
SODIUM COOLED REACTORS
TIN ALLOYS
ZIRCALOY
ZIRCALOY 2
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS