journal article·2020-10Open access

3D focused ion beam sectioning of zirconium oxides in Zircaloy-4 for the characterisation of cracking

H.E. Weekes, S. Ortner, A. Qaisar, S. Lozano-Perez, K. Jurkschat

Abstract

Abstract Sequential 2D sectioning and imaging using a dual-beam focused ion beam and scanning electron microscope has been used to characterise the interconnectivity of cracks in oxide films on Zircaloy-4. Evidence of cracks perpendicular to the metal/oxide interface have been observed in multiple oxides of different thicknesses. Such vertical features are considered critical in the provision of a percolation path between the environment and innermost band of lateral cracks (closest to oxide/environment interface), in between the lateral bands of cracks and between the final band of lateral cracks and the metal/oxide interface. Given the limited occurrence of cracks perpendicular to the metal/oxide interface, localised tensile surface strains have been considered as a potential source of initiation of these cracks.
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Research context

OpenAlex topics: Nuclear Materials and Properties · Radioactive element chemistry and processing · Hydrogen embrittlement and corrosion behaviors in metals

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