Microstructure evolution of cold-worked Zircaloy-4 under 20 mev Cu ion irradiation

Cold-worked Zircaloy-4, used for the fuel grid of research reactors, was irradiated with 20 MeV Cu ions at different doses varying from 0.007 to 0.15 displacements per atom (dpa) at room temperature. The microstructure evolution was investigated by grazing X-ray diffraction and positron annihilation...

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Bibliographic Details
Published in:Philosophical magazine letters 2019-04, Vol.99 (4), p.157-165
Main Authors: Naceri, S. E., Izerrouken, M., Ishaq, A., Guittoum, A., Sari, A., Khereddine, A., Kadouma, M., Menchi, O., Ghamnia, M.
Format: Article
Language:English
Subjects:
Cold working
dislocation loops
Displacements (lattice)
Evolution
Ion irradiation
Irradiation
Mechanical properties
Microstrain
Microstructure
Nanohardness
Nanoindentation
Nuclear fuels
Positron annihilation
Radiation
Radiation effects
S parameters
vacancy clusters
Zircaloy-4
Zircaloys (trademark)
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Summary:Cold-worked Zircaloy-4, used for the fuel grid of research reactors, was irradiated with 20 MeV Cu ions at different doses varying from 0.007 to 0.15 displacements per atom (dpa) at room temperature. The microstructure evolution was investigated by grazing X-ray diffraction and positron annihilation spectroscopy techniques (PAS). The mechanical properties were studied using nanoindentation. The microstrain, S parameter and nanohardness present similar behaviour. They all increase rapidly during the beginning of irradiation (first stage) and reach saturation value at 0.15 dpa. The experimental results reveal radiation-induced lattice distortion along the (110) direction indicating an anisotropic displacement energy.
ISSN:0950-0839
1362-3036
DOI:10.1080/09500839.2019.1641640