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Title: ATOMISTIC STUDIES OF GROWTH OF HELIUM BUBBLES IN a-FE

Experimental results and atomistic simulations demonstrate that nucleation and growth of He bubbles in a-Fe is will contribute to embrittlement and is significant material problem for development of fusion power. Understanding the nucleation growth of He bubbles in steels is one of the most important issues in nuclear fusion technology. In order to understand the formation and evolution of self-interstitials (SIAs) caused by He bubble growth under He-rich/vacancy-poor conditions, the clustering of He and growth of He bubbles in bulk Fe is currently being investigated by inserting He atoms one by one into one or two He clusters. We find that a 1/2 <111> dislocation loop is formed and eventually punched out by a single He cluster, but when two He clusters are present the configuration of the SIA loop formed depends on the distance between the two He clusters. A <100> cluster is created when the distance between the He clusters is less than about 6a0 and eventually grows into a <100>{100} dislocation loop.
Authors:
; ;
Publication Date:
OSTI Identifier:
1327192
Report Number(s):
PNNL-SA-104597
AT2030110
DOE Contract Number:
AC05-76RL01830
Resource Type:
Book
Resource Relation:
Related Information: Fusion Materials Semiannual Progress Report For the Period Ending June 30, 2014, 56:226-231. DOE/ER-0313/56
Publisher:
Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States.
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English