首页|(111699)The microstructure evolution and irradiation hardening in 15Cr-ODS steel irradiated by helium ions
(111699)The microstructure evolution and irradiation hardening in 15Cr-ODS steel irradiated by helium ions
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NSTL
Elsevier
Oxide dispersion strengthened (ODS) steels with excellent irradiation swelling resistance and high temperature creep resistance are regarded as one of the priority candidate materials for the frst wall/blanket materials in fusion reactors. Microstructure evolution and irradiation hardening in 15Cr-ODS steel irradiated by helium ions at R.T. and 400 ℃ respectively have been studied by transmission electron microscopy and nanoindentation technique. Three main oxides were identifed, including high-density dispersed Y-Ti-O nanoclusters, tens of nanometers Y_2TiO_5 and a few hundred nanometers Y2Ti2O7 particles with the largest size but the least density. Helium bubbles were homogeneously distributed in the matrix in both irradiated specimens and the aggregation state of bubbles near GBs was related to the nature of GB. The average size of bubbles increased and the density decreased in the steel irradiated at elevated temperature. A defect-depleted zone was observed near a GB with a Y_2TiO_5 precipitate imbedded and a large helium bubble was present at the interface of the Y_2TiO_5 particle/GB. It suggests that the GBs combined with Y_2TiO_5 can enhance the aggregation of helium bubbles since GBs can act as defect sinks as well as diffusion channels and Y_2TiO_5 has a high ability of trapping helium atoms. Signifcant irradiation hardening was obtained at both irradiation temperatures. The relationship between microstructure and the irradiation hardening was discussed.
NSTL
Elsevier
