Small-scale characterisation of irradiated nuclear materials: Part I – Microstructure

Journal Article · Wed Nov 26 00:00:00 EST 2014 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2014.11.067· OSTI ID:1261445

Edmondson, P. D. ^[1]; London, A. ^[1]; Xu, A. ^[1]; Armstrong, D. E. J. ^[1]; Roberts, S. G. ^[1]

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1. Univ. of Oxford (United Kingdom)

The behaviour of nanometre-scale precipitates in oxide dispersion strengthened (ODS) ferritic alloys and tungsten-rhenium alloys for nuclear applications has been examined by atom probe tomography (APT). Low Re content tungsten alloys showed no evidence of Re clustering following self-ion irradiation whereas the 25 at.% Re resulted in cluster formation. The size and composition of clusters varied depending on the material form during irradiation (pre-sharpened needle or bulk). Lastly, these results highlight the care that must be taken in interpreting data from ion irradiated pre-sharpened needles due to the presence of free surfaces. Self-ion irradiation of the ODS ferritic alloy resulted in a change in the composition of the clusters, indicating a transition from a near-stoichiometric Y₂Ti₂O₇ composition towards a Ti₂YO₅.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; Engineering and Physical Sciences Research Council (EPSRC)
• Grant/Contract Number: AC05-00OR22725; EP/H018921/1
• OSTI ID: 1261445
• Journal Information: Journal of Nuclear Materials, Vol. 462, Issue C; ISSN 0022-3115
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE