Correlation between chemical composition and size of very small oxide particles in the MA957 ODS ferritic alloy
| Autor: | Y. de Carlan, L. Boulanger, M. Brocq, L. Chaffron, F. Legendre, Hideo Sakasegawa, T. Cozzika |
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| Rok vydání: | 2009 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Metallurgy Oxide chemistry.chemical_element Yttrium Field electron emission chemistry.chemical_compound Nuclear Energy and Engineering Chemical engineering chemistry Transmission electron microscopy General Materials Science Particle size Chemical composition Stoichiometry Titanium |
| Zdroj: | Journal of Nuclear Materials. 384:115-118 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2008.11.001 |
| Popis: | ODS (oxide dispersion strengthened) alloys have superior creep properties. As it is well known, these excellent creep properties result from very fine oxide particles dispersed with the matrix. However, there is no common understanding about the nature of the very small oxide particles. Two hypotheses arise from the literature, 1: non-stoichiometric Y-, Ti-, O-enriched clusters and 2: stoichiometric Y2Ti2O7. In this work, both chemically extracted residue method and extraction replica method were applied to the commercial ODS ferritic alloy, MA957. These samples were then observed using XRD (X-ray diffractometry) and FEG–STEM (field emission gun–scanning transmission electron microscopy) with EDS (energy dispersive X-ray spectrometer). From the results, it was concluded that the composition of small particles is related to the particle size. They exhibit at least two types of phase, 1: non-stoichiometric Y-, Ti-, O-enriched clusters from ∼2 to ∼15 nm (Y/Ti |
| Databáze: | OpenAIRE |
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