Thermal stability of nanoscale helium bubbles in a 14YWT nanostructured ferritic alloy

P. D. Edmondson, C. M. Parish, Q. Li, M. K. Miller

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Abstract

A 14YWT nanostructured ferritic alloy has been irradiated with 335 keV He+ to a total fluence of 6.75 × 1020 He m -2 at a temperature of 400 C and subsequently thermally treated at 750 C for up to 100 h. Transmission electron microscopy has been used to characterize the size and distribution of the resultant helium bubbles. The results indicate that the bubbles generally increase in size and the distribution becomes more inhomogeneous during the thermal treatment. The results are discussed in terms of the helium supply and vacancy supersaturation, Brownian motion and coalescence, and Ostwald ripening mechanisms.

Original languageEnglish
Pages (from-to)84-90
Number of pages7
JournalJournal of Nuclear Materials
Volume445
Issue number1-3
DOIs
StatePublished - 2014

Funding

This research was sponsored by the Materials Sciences and Engineering Division, Office of Basic Energy Sciences, US Department of Energy, and by ORNL’s Shared Research Equipment (ShaRE) user facility, which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. The authors would like to thank Dr. D. T. Hoelzer of ORNL for providing the samples of the extruded 14YWT nanostructured ferritic alloy, Prof. A. Hallén of the Royal Institute of Technology, Kista, Sweden for performing the helium ion implantation, and Dr. Y. Zhang of ORNL for her assistance.

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