期刊
ACTA MATERIALIA
卷 141, 期 -, 页码 10-17出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.09.005
关键词
Atomistic simulation; He bubble growth; BCC tungsten; Cross-slip
资金
- Natural Science Foundation of China [51571082, 51325103]
- Hebei Province Education Department [ZD2017022]
- National Magnetic Confinement Fusion Program of China [201303109002]
Growth of helium (He) bubbles with different initial sizes in tungsten (W) has been investigated by performing molecular dynamics simulations. Based on the simulation results a new loop punching mechanism for the large helium bubble growth is proposed. Different from the growth of small-size He bubbles by pushing out self-interstitial atoms and then rearranging into a prismatic dislocation loop, a large-size bubble grows by pushing out a dislocation, subsequently cross-slipping of its screw components and finally evolving into a prismatic dislocation loop. Such dislocations may react with each other to form a dislocation net around the bubble rather than to convert to prismatic dislocation loops. (C) 2017 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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