Nanoscale analysis of ion irradiated ODS 14YWT ferritic alloy

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

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

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. 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.

Original languageEnglish
Article number151852
JournalJournal of Nuclear Materials
Volume528
DOIs
StatePublished - Jan 2020

Funding

Funding from US-DOE NEUP IRP (DE-NE0000639), UK-EPSRC (grants EP/P001645/1, EP/L025817/1 and EP/M022803/1) and Comunidad Autónoma de Madrid-Spain (2017-T1/IND-5439) is acknowledged. Part of the FIB sample preparation used UKAEA's Materials Research Facility, which has been funded by and is part of the UK's National Nuclear User Facility and Henry Royce Institute for Advanced Materials. Dr Scott J. Tumey is gratefully acknowledged for conducting the irradiation experiment at CAMS-LLNL. Funding from US-DOE NEUP IRP ( DE-NE0000639 ), UK-EPSRC (grants EP/P001645/1 , EP/L025817/1 and EP/M022803/1 ) and Comunidad Autónoma de Madrid-Spain ( 2017-T1/IND-5439 ) is acknowledged. Part of the FIB sample preparation used UKAEA’s Materials Research Facility, which has been funded by and is part of the UK’s National Nuclear User Facility and Henry Royce Institute for Advanced Materials. Dr Scott J. Tumey is gratefully acknowledged for conducting the irradiation experiment at CAMS-LLNL.

Keywords

  • 14YWT
  • Atom probe tomography
  • Clusters
  • Ion irradiation
  • ODS alloys

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