Zirconium hydrides and Fe redistribution in Zr-2.5%Nb alloy under ion irradiation
| Autor: | G.K. Shek, Mark R. Daymond, Zhongwen Yao, J. Cui, Yasir Idrees |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Nuclear and High Energy Physics Zirconium Materials science Hydrogen Hydride Metallurgy Alloy Zirconium alloy chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Nuclear Energy and Engineering chemistry Chemical engineering Transmission electron microscopy 0103 physical sciences engineering General Materials Science Irradiation 0210 nano-technology |
| Zdroj: | Journal of Nuclear Materials. 480:332-343 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2016.08.031 |
| Popis: | Zr-2.5%Nb alloy is used to fabricate the pressure tubes of the CANDU reactor. The pressure tube is the primary pressure boundary for coolant in the CANDU design and is susceptible to delayed hydride cracking, reduction in fracture toughness upon hydride precipitation and potentially hydride blister formation. The morphology and nature of hydrides in Zr-2.5%Nb with 100 wppm hydrogen has been investigated using transmission electron microscopy. The effect of hydrides on heavy ion irradiation induced decomposition of the β phase has been reported. STEM-EDX mapping was employed to investigate the distribution of alloying elements. The results show that hydrides are present in the form of stacks of different sizes, with length scales from nano- to micro-meters. Heavy ion irradiation experiments at 250 °C on as-received and hydrided Zr-2.5%Nb alloy, show interesting effects of hydrogen on the irradiation induced redistribution of Fe. It was found that Fe is widely redistributed from the β phase into the α phase in the as-received material, however, the loss of Fe from the β phase and subsequent precipitation is retarded in the hydrided material. This preliminary work will further the current understanding of microstructural evolution of Zr based alloys in the presence of hydrogen. |
| Databáze: | OpenAIRE |
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