Influence of SiC grain boundary character on fission product transport in irradiated TRISO fuel
| Autor: | I.J. van Rooyen, T.M. Lillo |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Nuclear and High Energy Physics
Fission products Materials science Condensed matter physics Misorientation Metallurgy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 010305 fluids & plasmas chemistry.chemical_compound Materials Science(all) Nuclear Energy and Engineering chemistry Transmission electron microscopy 0103 physical sciences Silicon carbide Grain boundary diffusion coefficient Precession electron diffraction General Materials Science Grain boundary 0210 nano-technology Grain boundary strengthening |
| Zdroj: | Journal of Nuclear Materials. 473:83-92 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2016.01.040 |
| Popis: | In this study, the fission product precipitates at silicon carbide grain boundaries from an irradiated TRISO particle were identified and correlated with the associated grain boundary characteristics. Precession electron diffraction in the transmission electron microscope provided the crystallographic information needed to identify grain boundary misorientation and boundary type (i.e., low angle, random high angle or coincident site lattice (CSL)-related). The silicon carbide layer was found to be composed mainly of twin boundaries and small fractions of random high angle and low angle grain boundaries. Most fission products were found at random, high-angle grain boundaries, with small fractions at low-angle and CSL-related grain boundaries. Palladium (Pd) was found at all types of grain boundaries while Pd-uranium and Pd-silver precipitates were only associated with CSL-related and random, high-angle grain boundaries. Precipitates containing only Ag were found only at random, high-angle grain boundaries, but not at low angle or CSL-related grain boundaries. |
| Databáze: | OpenAIRE |
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