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The transport and fate of helium in nanostructured ferritic alloys at fusion relevant He/dpa ratios and dpa rates
- Source :
-
Journal of Nuclear Materials . Aug2007 Part A, Vol. 367-370 Issue A, p399-410. 12p. - Publication Year :
- 2007
-
Abstract
- 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 5μm thick NiAl coatings on TEM discs producing a uniform He concentration of 5–50appm He/dpa to a depth of 5–8μm. Initial post-irradiation TEM observations of MA957 irradiated to 9dpa and 380appm He at 500°C provide strong evidence for the existence of a high density of small ⩽1nm 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. [Copyright &y& Elsevier]
- Subjects :
- *HELIUM
*ALLOYS
*FERRITIC steel
*FUSION (Phase transformation)
Subjects
Details
- Language :
- English
- ISSN :
- 00223115
- Volume :
- 367-370
- Issue :
- A
- Database :
- Academic Search Index
- Journal :
- Journal of Nuclear Materials
- Publication Type :
- Academic Journal
- Accession number :
- 25849196
- Full Text :
- https://doi.org/10.1016/j.jnucmat.2007.03.047