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In situ TEM thermal annealing of high purity Fe10wt%Cr alloy thin foils implanted with Ti and O ions

Abstract : ODS steels are ferritic-martensitic steels reinforced with (Y,Ti) oxide dispersions to enhance the creep and radiation resistance at elevated temperatures. Their conventional fabrication is achieved by ball milling followed by high-temperature consolidation. An alternative approach of ion beam synthesis has been suggested recently to study the early precipitation stages of oxide nanoparticles. To clarify the details of Ti-based oxide nanoparticle precipitation, Ti+ and O+ ions were implanted into high-purity Fe-10 wt%Cr thin foils at room temperature and subjected to thermal annealing. Nano-size oxide particles and larger surface oxide islands with pronounced Cr enrichment were observed after in situ Transmission Electron Microscopy (TEM) annealing at 600 °C and were identified as a mixed iron-chromium spinel. The features observed after ex situ annealing at 800 °C were also identified as iron-chromium oxide, but with a certain titanium enrichment. The observations thus suggest that titanium plays no major role in the early stages of oxide precipitation.
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https://hal.archives-ouvertes.fr/hal-02327774
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Submitted on : Wednesday, December 16, 2020 - 3:58:27 PM
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Martin Owusu-Mensah, Stéphanie Jublot-Leclerc, Aurélie Gentils, Cédric Baumier, Joël Ribis, et al.. In situ TEM thermal annealing of high purity Fe10wt%Cr alloy thin foils implanted with Ti and O ions. Nucl.Instrum.Meth.B, 2019, 461, pp.219-225. ⟨10.1016/j.nimb.2019.10.009⟩. ⟨hal-02327774⟩

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