Helium entrapment in a nanostructured ferritic alloy

Journal Article · Sat Jan 01 04:00:00 EST 2011 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2011.07.024· OSTI ID:1023308

Edmondson, Philip D ^[1]; Parish, Chad M ^[1]; Zhang, Yanwen ^[1]; Hallen, Dr Anders ^[2]; Miller, Michael K ^[1]

---

1. ORNL
2. Royal Institute of Tecnhology, Kista, Sweeden

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.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1023308
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 65; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ATOMS
BUBBLES
CONFIGURATION
DISLOCATIONS
GRAIN BOUNDARIES
HELIUM
HYPOTHESIS
NUCLEATION
PROBES
REACTORS
SERVICE LIFE
SURFACE AREA
TOMOGRAPHY
TRANSMISSION ELECTRON MICROSCOPY