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Journal of Materials Science

, Volume 42, Issue 16, pp 6633–6637 | Cite as

Hydrogen in Zircaloy-4: effects of the neutron irradiation on the hydride formation

  • Pablo VizcaínoEmail author
  • Abraham D. Banchik
  • José P. Abriata
Article

Abstract

X-ray diffraction patterns of neutron irradiated Zircaloy-4 samples were obtained at the Brazilian Synchrotron Light Laboratory (LNLS) to study the effects of the fast neutron fluxes and post-irradiation thermal treatments on the zirconium hydride evolution. The high intensity and resolution of the synchrotron beam allowed to detect the (111)δ and (220)δ diffraction peaks of the ZrH1.5 + x (0 ≤ x≤ 0.16) δ-phase in unirradiated Zircaloy-4 samples having a hydrogen concentration as low as 0.2 at.% (20 wppm). Then, irradiated samples, that were taken from the Zircaly-4 core components of the argentine HWPR Atucha I Nuclear Power Plant (CNA-1) were studied with that radiation to detect the diffraction peaks of ZrH1.5 + x δ-phase particles precipitated in samples having hydrogen isotope concentration lower than 2 at.% (220 wppm). A significant increment of the (111)δ and (220)δ peak areas were observed at room temperature after post-irradiation thermal treatments at 600 °C during 4 h. These results indicate that after the annealing a hydrogen concentration between 35 to 70 wppm, which were apparently absent in the irradiated samples has precipitated at room temperature as zirconium hydrides. That amount was estimated from a (220)δ peak area versus the bulk H concentration regression line, made with unirradiated samples. These results get support to a hydrogen trapping hypothesis proposed in previous works. In addition, it has been shown that the zirconium hydride that precipitate in the irradiated samples have the equilibrium δ-ZrH1.5 + x cubic crystalline structure.

Keywords

Hydride Irradiate Sample Irradiate Material Unirradiated Sample Hydrogen Trapping 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We are grateful for the support given by the Brazilian Synchrotron Light Laboratory (LNLS) under proposal D12A-XRD1–2805. In addition we are in debt with Aldo F. Craievich for his kindness assistance.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Pablo Vizcaíno
    • 1
    • 2
    Email author
  • Abraham D. Banchik
    • 1
  • José P. Abriata
    • 1
  1. 1.Comisión Nacional de Energía AtómicaBuenos AiresArgentina
  2. 2.LMFAE, UACNCentro Atómico Ezeiza, Presbítero Juan González y Aragón No. 15Ezeiza, Buenos AiresArgentina

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