Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volume 202, Issue -, Pages 51-55Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0168-583X(02)01829-3
Keywords
nanocrystalline materials; grain boundaries; radiation damage; stacking fault tetrahedra; molecular dynamics
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Large scale molecular dynamics computer simulations are performed to study the role of the grain boundary (GB) during the cascade evolution in irradiated nanocrystalline Ni. At all primary knock-on atom (PKA) energies in cascades near GBs, the damage produced after cooling down is vacancy dominated. Truncated stacking fault tetrahedra (TSFTs) are easily formed at 10 keV and higher PKA energies. At the higher energies a complex partial dislocation network forms, consisting of TSFTs. The GB acts as an interstitial sink without undergoing major structural changes. (C) 2002 Elsevier Science B.V. All rights reserved.
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