Identifying suboxide grains at the metal-oxide interface of a corroded Zr-1.0%Nb alloy using (S)TEM, transmission-EBSD and EELS

Jing Hu, Alistair Garner, Na Ni, Ali Gholinia, Rebecca J. Nicholls, Sergio Lozano-Perez, Philipp Frankel, Michael Preuss, Chris R.M. Grovenor

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Abstract

Here we report a methodology combining TEM, STEM, Transmission-EBSD and EELS to analyse the structural and chemical properties of the metal-oxide interface of corroded Zr alloys in unprecedented detail. TEM, STEM and diffraction results revealed the complexity of the distribution of suboxide grains at the metal-oxide interface. EELS provided accurate quantitative analysis of the oxygen concentration across the interface, identifying the existence of local regions of stoichiometric ZrO and Zr3O2 with varying thickness. Transmission-EBSD confirmed that the suboxide grains can be indexed with the hexagonal ZrO structure predicted with ab initio by Nicholls et al. (2014). The t-EBSD analysis has also allowed for the mapping of a relatively large region of the metal-oxide interface, revealing the location and size distribution of the suboxide grains.

Original languageEnglish
Pages (from-to)35-42
Number of pages8
JournalMicron
Volume69
DOIs
Publication statusPublished - Feb 2015
Externally publishedYes

Keywords

  • (S)TEM
  • EELS
  • Oxidation mechanism
  • Suboxide
  • Transmission Kikuchi Diffraction
  • Transmission-EBSD
  • Zirconium alloys

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