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Length-scale Effects in Cascade Damage Production in Iron

Published online by Cambridge University Press:  15 March 2011

R. E. Stoller ,
P. J. Kamenski  and
Yu. N. Osetsky
R. E. Stoller
Affiliation:
Materials Science and Technology Division Oak Ridge National Laboratory, Oak Ridge, TN 37831-6138
P. J. Kamenski
Affiliation:
Department of Materials Science and EngineeringUniversity of Wisconsin, Madison, WI (now University of Oxford, UK)
Yu. N. Osetsky
Affiliation:
Materials Science and Technology Division Oak Ridge National Laboratory, Oak Ridge, TN 37831-6138
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Abstract

Molecular dynamics simulations provide an atomistic description of the processes that control primary radiation damage formation in atomic displacement cascades. An extensive database of simulations describing cascade damage production in single crystal iron has been compiled using a modified version of the interatomic potential developed by Finnis and Sinclair. This same potential has been used to investigate primary damage formation in nanocrystalline iron in order to have a direct comparison with the single crystal results. A statistically significant number of simulations were carried out at cascade energies of 10 keV and 20 keV and temperatures of 100 and 600K to make this comparison. The results demonstrate a significant influence of nearby grain boundaries as a sink for mobile defects during the cascade cooling phase. This alters the residual primary damage that survives the cascade event. Compared to single crystal, substantially fewer interstitials survive in the nanograined iron, while the number of surviving vacancies is similar or slightly greater than the single crystal result. The fraction of the surviving interstitials contained in clusters is also reduced. The asymmetry in the survival of the two types of point defects is likely to alter damage accumulation at longer times.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1125: Symposium R – Materials for Future Fusion and Fission Technologies , 2008 , 1125-R05-05
Copyright
Copyright © Materials Research Society 2009

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