تقرير
From solid solution to cluster formation of Fe and Cr in $\alpha$-Zr
| العنوان: | From solid solution to cluster formation of Fe and Cr in $\alpha$-Zr |
|---|---|
| المؤلفون: | Burr, P. A., Wenman, M. R., Gault, B., Moody, M. P., Ivermark, M., Rushton, M. J. D., Preuss, M., Edwards, L., Grimes, R. W. |
| المصدر: | Journal of Nuclear Materials, 467 (2015) 320-331 |
| سنة النشر: | 2015 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | To understand the mechanisms by which Fe and Cr additions increase the corrosion rate of irradiated Zr alloys, a combination of experimental (atom probe tomography, x-ray diffraction and thermoelectric power measurements) and modelling (density functional theory) techniques are employed to investigate the non-equilibrium solubility and clustering of Fe and Cr in binary Zr alloys. Cr occupies both interstitial and substitutional sites in the {\alpha}-Zr lattice, Fe favours interstitial sites, and a low-symmetry site that was not previously modelled is found to be the most favourable for Fe. Lattice expansion as a function of alloying concentration (in the dilute regime) is strongly anisotropic for Fe additions, expanding the $c$-axis while contracting the $a$-axis. Defect clusters are observed at higher solution concentrations, which induce a smaller amount of lattice strain compared to the dilute defects. In the presence of a Zr vacancy, all two-atom clusters are more soluble than individual point defects and as many as four Fe or three Cr atoms could be accommodated in a single Zr vacancy. The Zr vacancy is critical for the increased solubility of defect clusters, the implications for irradiation induced microstructure changes in Zr alloys are discussed. Comment: 15 pages including figure, 9 figures, 2 tables. Submitted for publication in Acta Mater, Journal of Nuclear Materials (2015) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.jnucmat.2015.10.001 |
| URL الوصول: | http://arxiv.org/abs/1501.06732 |
| رقم الأكسشن: | edsarx.1501.06732 |
| قاعدة البيانات: | arXiv |
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