Effect of external stress on deuteride (hydride) precipitation in Zircaloy-4 using in situ neutron diffraction

Jun li Lin, Ke An, Alexandru D. Stoica, Brent J. Heuser

Research output: Contribution to journalArticlepeer-review

Abstract

In situ neutron diffraction is utilized to study the deuteride (hydride) precipitation behavior in a cold-worked stress-relieved (CWSR) Zircaloy-4 material upon cooling from 420 °C to room temperature with a 78 MPa external stress applied along the rolling direction (RD) of the material. Two banks detector capture the diffraction signal from two principal directions of the specimen, the normal direction (ND) and the rolling direction (RD). The evolution of deuterium concentration in zirconium solid solution along the two specimen directions is measured by studying the δ-(220) peak intensity, applying the Rietveld refinement method to the diffraction data and using the measured zirconium c-axis lattice distortion. The deuterium concentration is observed to be higher for zirconium grains in the ND than the RD. The terminal solid solubility of precipitation (TSSp) for deuterium in the solution is then described using the Arrhenius equation. It is observed that the applied stress reduces the energy term Q in the Arrhenius equation when compared with the unstressed Q values from the work of others. A model by Puls is applied to study the effect of stress on deuterium solubility, with polycrystalline hydride precipitation strain calculated using the Kearns factor representative of the studied material. The experimental result does not agree with the model prediction of Puls.

Original languageEnglish (US)
Pages (from-to)396-405
Number of pages10
JournalJournal of Nuclear Materials
Volume487
DOIs
StatePublished - Apr 15 2017

Keywords

  • Deuterium (hydrogen) solubility
  • Neutron diffraction
  • Zirconium alloys
  • Zirconium deuteride (hydride)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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