The transport and fate of helium in nanostructured ferritic alloys at fusion relevant He/dpa ratios and dpa rates

T. Yamamoto; G. R. Odette; P. Miao; D. T. Hoelzer; J. Bentley; N. Hashimoto; H. Tanigawa; R. J. Kurtz

doi:10.1016/j.jnucmat.2007.03.047

The transport and fate of helium in nanostructured ferritic alloys at fusion relevant He/dpa ratios and dpa rates

T. Yamamoto, G. R. Odette, P. Miao, D. T. Hoelzer, J. Bentley, N. Hashimoto, H. Tanigawa, R. J. Kurtz

Alloy Behavior & Design

Research output: Contribution to journal › Article › peer-review

114 Scopus citations

Abstract

A novel in situ ⁵⁹Ni(n,α) reaction He-implanter technique is described, that can be used to characterize the effect of the He/dpa ratio on microstructural evolution and changes in the flow properties of various materials at fusion relevant conditions. Irradiations in the high flux isotope reactor resulted in α-implantation from 1 to 5 μm thick NiAl coatings on TEM discs producing a uniform He concentration of 5-50 appm He/dpa to a depth of 5-8 μm. Initial post-irradiation TEM observations of MA957 irradiated to 9 dpa and 380 appm He at 500 °C provide strong evidence for the existence of a high density of small ≤1 nm size bubbles trapped on nano-scale YTiO clusters. In contrast, similar irradiations of Eurofer 97, described in a companion paper, produce a lower number density of larger cavities, which may be a mixture of bubbles and voids.

Original language	English
Pages (from-to)	399-410
Number of pages	12
Journal	Journal of Nuclear Materials
Volume	367-370 A
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnucmat.2007.03.047
State	Published - Aug 1 2007

Funding

The authors are grateful to essential theoretical support for He production calculations provided by Dr L.R. Greenwood, US-JAEA program management by Dr R.E. Stoller, technical support for NiAl coating fabrication by Mr D. Klingensmith, Dr H. Kishimoto and Dr M. Alinger, and for irradiation experiments by Mr K. Thoms and Mr D. Heatherly. This research was supported, in part, by the US Department of Energy, Office of Fusion Energy Sciences, under contract DE-FG03-94ER54275 and DE-AC06-76RLO1830 by the US Department of Energy, Office of Nuclear Energy, under contract DE-FC07-05ID14663 and I-NERI 2001-007-F. Research at the ORNL SHaRE Facility was supported in part by the Division of Scientific User Facilities, Office of Basic Energy Sciences, U.S. Department of Energy. ORNL is managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725.

Funders	Funder number
U.S. Department of Energy
Office of Nuclear Energy	I-NERI 2001-007-F, DE-FC07-05ID14663
Basic Energy Sciences
Fusion Energy Sciences	DE-FG03-94ER54275, DE-AC06-76RLO1830
Oak Ridge National Laboratory	DE-AC05-00OR22725

Access to Document

10.1016/j.jnucmat.2007.03.047

Cite this

@article{c1b622923a044bb4b82f14bf8b5af021,

title = "The transport and fate of helium in nanostructured ferritic alloys at fusion relevant He/dpa ratios and dpa rates",

abstract = "A novel in situ 59Ni(n,α) reaction He-implanter technique is described, that can be used to characterize the effect of the He/dpa ratio on microstructural evolution and changes in the flow properties of various materials at fusion relevant conditions. Irradiations in the high flux isotope reactor resulted in α-implantation from 1 to 5 μm thick NiAl coatings on TEM discs producing a uniform He concentration of 5-50 appm He/dpa to a depth of 5-8 μm. Initial post-irradiation TEM observations of MA957 irradiated to 9 dpa and 380 appm He at 500 °C provide strong evidence for the existence of a high density of small ≤1 nm size bubbles trapped on nano-scale YTiO clusters. In contrast, similar irradiations of Eurofer 97, described in a companion paper, produce a lower number density of larger cavities, which may be a mixture of bubbles and voids.",

author = "T. Yamamoto and Odette, {G. R.} and P. Miao and Hoelzer, {D. T.} and J. Bentley and N. Hashimoto and H. Tanigawa and Kurtz, {R. J.}",

year = "2007",

month = aug,

day = "1",

doi = "10.1016/j.jnucmat.2007.03.047",

language = "English",

volume = "367-370 A",

pages = "399--410",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

number = "SPEC. ISS.",

}

TY - JOUR

T1 - The transport and fate of helium in nanostructured ferritic alloys at fusion relevant He/dpa ratios and dpa rates

AU - Yamamoto, T.

AU - Odette, G. R.

AU - Miao, P.

AU - Hoelzer, D. T.

AU - Bentley, J.

AU - Hashimoto, N.

AU - Tanigawa, H.

AU - Kurtz, R. J.

PY - 2007/8/1

Y1 - 2007/8/1

N2 - A novel in situ 59Ni(n,α) reaction He-implanter technique is described, that can be used to characterize the effect of the He/dpa ratio on microstructural evolution and changes in the flow properties of various materials at fusion relevant conditions. Irradiations in the high flux isotope reactor resulted in α-implantation from 1 to 5 μm thick NiAl coatings on TEM discs producing a uniform He concentration of 5-50 appm He/dpa to a depth of 5-8 μm. Initial post-irradiation TEM observations of MA957 irradiated to 9 dpa and 380 appm He at 500 °C provide strong evidence for the existence of a high density of small ≤1 nm size bubbles trapped on nano-scale YTiO clusters. In contrast, similar irradiations of Eurofer 97, described in a companion paper, produce a lower number density of larger cavities, which may be a mixture of bubbles and voids.

AB - A novel in situ 59Ni(n,α) reaction He-implanter technique is described, that can be used to characterize the effect of the He/dpa ratio on microstructural evolution and changes in the flow properties of various materials at fusion relevant conditions. Irradiations in the high flux isotope reactor resulted in α-implantation from 1 to 5 μm thick NiAl coatings on TEM discs producing a uniform He concentration of 5-50 appm He/dpa to a depth of 5-8 μm. Initial post-irradiation TEM observations of MA957 irradiated to 9 dpa and 380 appm He at 500 °C provide strong evidence for the existence of a high density of small ≤1 nm size bubbles trapped on nano-scale YTiO clusters. In contrast, similar irradiations of Eurofer 97, described in a companion paper, produce a lower number density of larger cavities, which may be a mixture of bubbles and voids.

UR - http://www.scopus.com/inward/record.url?scp=34447500408&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2007.03.047

DO - 10.1016/j.jnucmat.2007.03.047

M3 - Article

AN - SCOPUS:34447500408

SN - 0022-3115

VL - 367-370 A

SP - 399

EP - 410

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SPEC. ISS.

ER -

The transport and fate of helium in nanostructured ferritic alloys at fusion relevant He/dpa ratios and dpa rates

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this