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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 was 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 (HFIR) resulted in α-implantation from thin 1 to 5 µm NiAl coatings on TEM discs producing a uniform He concentration of 5 to 50 appm He/dpa to a depth of 5 to 8 μm. Initial post-irradiation TEM observations of MA957 irradiated to 9 dpa and 380 appm He at 500 ºC provide strong evidence for the existence of 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.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
917966
Report Number(s):
PNNL-SA-55263
AT6020100
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials, 367-370:399-410
Additional Journal Information:
Journal Name: Journal of Nuclear Materials, 367-370:399-410
Country of Publication:
United States
Language:
English
Subject:
fusion, helium, neutron irradiation, ferritic/martensitic steels

Citation Formats

Yamamoto, Takuya, Odette, George R, Miao, Pifeng, Hoelzer, D T, Bentley, James, Hashimoto, N, Tanigawa, Hiroyasu, and Kurtz, Richard J. The Transport and Fate of Helium in Nanostructured Ferritic Alloys at Fusion Relevant He/DPA Ratios and DPA Rates. United States: N. p., 2007. Web. doi:10.1016/j.jnucmat.2007.03.047.
Yamamoto, Takuya, Odette, George R, Miao, Pifeng, Hoelzer, D T, Bentley, James, Hashimoto, N, Tanigawa, Hiroyasu, & Kurtz, Richard J. The Transport and Fate of Helium in Nanostructured Ferritic Alloys at Fusion Relevant He/DPA Ratios and DPA Rates. United States. doi:10.1016/j.jnucmat.2007.03.047.
Yamamoto, Takuya, Odette, George R, Miao, Pifeng, Hoelzer, D T, Bentley, James, Hashimoto, N, Tanigawa, Hiroyasu, and Kurtz, Richard J. Wed . "The Transport and Fate of Helium in Nanostructured Ferritic Alloys at Fusion Relevant He/DPA Ratios and DPA Rates". United States. doi:10.1016/j.jnucmat.2007.03.047.
@article{osti_917966,
title = {The Transport and Fate of Helium in Nanostructured Ferritic Alloys at Fusion Relevant He/DPA Ratios and DPA Rates},
author = {Yamamoto, Takuya and Odette, George R and Miao, Pifeng and Hoelzer, D T and Bentley, James and Hashimoto, N and Tanigawa, Hiroyasu and Kurtz, Richard J},
abstractNote = {A novel in-situ 59Ni(n,α) reaction He-implanter technique is described, that was 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 (HFIR) resulted in α-implantation from thin 1 to 5 µm NiAl coatings on TEM discs producing a uniform He concentration of 5 to 50 appm He/dpa to a depth of 5 to 8 μm. Initial post-irradiation TEM observations of MA957 irradiated to 9 dpa and 380 appm He at 500 ºC provide strong evidence for the existence of 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.},
doi = {10.1016/j.jnucmat.2007.03.047},
journal = {Journal of Nuclear Materials, 367-370:399-410},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {8}
}