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


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.


Hydride Irradiate Sample Irradiate Material Unirradiated Sample Hydrogen Trapping 
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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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