August 2011

Journal

Helium entrapment in a nanostructured ferritic alloy

By:
Edmondson, Philip D; Parish, Chad M; Zhang, Yanwen ; Hallen, Anders; Miller, Michael K
Journal Name:
Scripta Materialia
Page Number:
731-734
Volume:
65
Issue Number:
8
Publication Date:
August 25, 2011
View DOI Listing:
https://doi.org/10.1016/j.scriptamat.2011.07.024

Abstract

The nanostructured ferritic alloy 14YWT has been irradiated with He ions to simulate accumulation of He during the service life of a nuclear reactor to test the hypothesis that the large surface area for nanoclusters is a preferential nucleation site for bubbles. Transmission electron microscopy and atom probe tomography showed that high number densities of He bubbles were formed on the surface of nanoclusters and Ti(C,N) precipitates, and along grain boundaries and dislocations. At higher fluences, facetted bubbles are formed and it is postulated that the lowest energy state configuration is the truncated rhombic dodecahedron.


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