Effect of helium on dispersoid evolution under self-ion irradiation in a dual-phase 12Cr oxide-dispersion-strengthened alloy

Kim, Hyosim; Gigax, Jonathan Gregory; Wang, Tianyao; Ukai, Shigeharu; Garner, Frank A.; Shao, Lin

doi:10.3390/ma12203343

Title: Effect of helium on dispersoid evolution under self-ion irradiation in a dual-phase 12Cr oxide-dispersion-strengthened alloy

Journal Article · Mon Oct 14 00:00:00 EDT 2019 · Materials

DOI:https://doi.org/10.3390/ma12203343· OSTI ID:1571626

Kim, Hyosim ^[1];

^[1]; Wang, Tianyao ^[2]; Ukai, Shigeharu ^[3]; Garner, Frank A. ^[2]; Shao, Lin ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Texas A & M Univ., College Station, TX (United States)
Hokkaido Univ., Sapporo (Japan)

As one candidate alloy for future Generation IV and fusion reactors, a dual-phase 12Cr oxide-dispersion-strengthened (ODS) alloy was developed for high temperature strength and creep resistance and has shown good void swelling resistance under high damage self-ion irradiation at high temperature. However, the effect of helium and its combination with radiation damage on oxide dispersoid stability needs to be investigated. In this study, 120 keV energy helium was preloaded into specimens at doses of 1 × 10¹⁵ and 1 × 10¹⁶ ions/cm² at room temperature, and 3.5 MeV Fe self-ions were sequentially implanted to reach 100 peak displacement-per-atom at 475 °C. He implantation alone in the control sample did not affect the dispersoid morphology. After Fe ion irradiation, a dramatic increase in density of coherent oxide dispersoids was observed at low He dose, but no such increase was observed at high He dose. The study suggests that helium bubbles act as sinks for nucleation of coherent oxide dispersoids, but dispersoid growth may become difficult if too many sinks are introduced, suggesting that a critical mass of trapping is required for stable dispersoid growth.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1571626

Report Number(s):: LA-UR-19-29321; TRN: US2001450

Journal Information:: Materials, Vol. 12, Issue 20; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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