Rapid assessment of structural and compositional changes during early stages of zirconium alloy oxidation
Journal Article
·
· npj Materials Degradation
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Texas, El Paso, TX (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Univ. of Illinois at Urbana-Champaign, IL (United States)
A multimodal chemical imaging approach has been developed and applied to detail the dynamic, atomic-scale changes associated with oxidation of a zirconium alloy (Zircaloy-4). Scanning transmission electron microscopy, a gas-phase reactor chamber attached to an atom probe tomography instrument, and synchrotron-based X-ray absorption near-edge spectroscopy were employed to reveal morphology, composition, crystal, and electronic structure changes that occur during initial stages of oxidation at 300 °C. Oxidation was carried out in 10 mbar O2 gas for short exposure times of 1 and 5 min. A multilayered oxide film with a cubic ZrO adjacent to the oxide/metal interface, a nanoscopic transition region with a graded composition of ZrO2-x (where 0 < x < 1), and tetragonal ZrO2 in the outermost oxide were formed. Partitioning of the major alloying element (tin) to the oxide/metal interface and heterogeneously within the oxide accompanied the development of the layered oxide. Our work provides a rapid, high-throughput approach for detailed characterisation of initial stages of zirconium alloy oxidation at an accelerated time scale, with implications for several other alloy systems.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1695771
- Report Number(s):
- PNNL-SA--150333
- Journal Information:
- npj Materials Degradation, Journal Name: npj Materials Degradation Journal Issue: 1 Vol. 4; ISSN 2397-2106
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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