Site specific dependencies of hydrogen concentrations in zirconium hydrides

Journal Article · Wed Sep 05 00:00:00 EDT 2018 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2018.08.044· OSTI ID:1481703

Tunes, Matheus A. ^[1]; Silva, Chinthaka M. ^[2]; Edmondson, Philip D. ^[2]

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1. Univ. of Huddersfield, Queensgate (United Kingdom)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, Zircaloy-4 specimens were H-charged up to 1230 wppmH. Intra-, inter- and trans-granular zirconium hydride precipitates (or ZrH_2–x where 1/(2–x) is the Zr/H molar ratio) were observed throughout the α-Zr matrix. Transmission Electron Microscopy and electron diffraction confirmed that the ZrH_2–x precipitates were face-centred cubic structures consistent with the δ-ZrH_2–x phase. Electron Energy Loss Spectroscopy analysis of the δ-ZrH_2–x precipitates at three different nucleation spots displayed shifts in the plasmon energy loss peaks that can be attributed to local variations of the H content of the δ-ZrH_2–x precipitates rather than the presence of different ZrH_2–x phases as has previously been assumed.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1481703
• Alternate ID(s): OSTI ID: 22819332
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: C Vol. 158; ISSN 1359-6462
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Electron Energy Loss Spectroscopy
Jahn-Teller effect
Transmission electron microscopy
Zirconium hydrides