Nanoscale analysis of ion irradiated ODS 14YWT ferritic alloy

Auger, Maria A.; Hoelzer, David T.; Field, Kevin G.; Moody, Michael P.

doi:10.1016/j.jnucmat.2019.151852

Title: Nanoscale analysis of ion irradiated ODS 14YWT ferritic alloy

Journal Article · Mon Oct 21 00:00:00 EDT 2019 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2019.151852· OSTI ID:1607192

Auger, Maria A. ^[1];

^[2];

^[2]; Moody, Michael P. ^[3]

Univ. Carlos III de Madrid (Spain); Univ. of Oxford (United Kingdom)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Oxford (United Kingdom)

In this work, the nanoscale microstructure of an advanced oxide dispersion strengthened (ODS) 14YWT ferritic alloy (SM13 heat) with nominal composition Fe–14Cr–3W-0.4Ti-0.3Y₂O₃ (wt. %) has been characterized by atom probe tomography (APT) before and after ion irradiation with 70 MeV Fe⁹⁺ ions at 450 °C to a total dose of 21 dpa. A detailed solute cluster analysis of APT data reveals that, in the manufacturing process, larger nanoparticles form in or close to the grain boundaries respective to those inside grains. The evolution of the nanoparticles after irradiation seems to be related to their location, as a higher increase in the number density and in the Y:Ti ratio is observed for the nanoparticles in or close to grain boundaries. Furthermore, APT analysis also shows Cr, W and C segregation to grain boundaries enhanced by the irradiation. A previous study of this same alloy before and after irradiation reports that the mechanical properties do not seem to be affected, but the microstructure was not investigated to confirm. The present work confirms little microstructural evolution after irradiation in this 14YWT alloy, indicating tolerance at the given irradiation conditions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Engineering and Physical Sciences Research Council (EPSRC); USDOE Office of Nuclear Energy (NE). Nuclear Energy University Program (NEUP); Comunidad Autonoma de Madrid-Spain; Henry Royce Institute for Advanced Materials

Grant/Contract Number:: AC05-00OR22725; NE0000639; EP/P001645/1; EP/L025817/1; EP/M022803/1

OSTI ID:: 1607192

Alternate ID(s):: OSTI ID: 1577898

Journal Information:: Journal of Nuclear Materials, Vol. 528, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

Citation information provided by
Web of Science

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