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The Influence of PKA Direction on Displacement Cascade Evolution

Published online by Cambridge University Press:  21 March 2011

Roger E. Stoller
Roger E. Stoller*
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN, USA, rkn@ornl.gov
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Abstract

An extensive database of atomic displacement cascades in iron has been developed using molecular dynamic simulations. More than 300 cascades have been completed at 100K at energies between 100 eV and 100 keV, with fewer simulations at 600 and 900K. A systematic evaluation of the database has revealed an unexpected influence of PKA direction in low energy simulations. For primary knockon (PKA) directions that lie in the close-packed {110} planes, the cascade tends to be constrained to develop in only two dimensions. This planar “channeling” leads to much higher point defect survival than when a random high-index PKA direction is used to initiate the cascade. For example, the average number of stable Frenkel pair produced in 300 eV cascades is about 2.1 for cascades initiated with a [135] PKA, and 3.2 for [114] cascades. Some influence of this PKA direction effect was observed for energies up to 2 keV. The interstitial clustering behavior also appears to be affected in cascades with high defect survival.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 650: Symposium R – Microstructural Processes in Irradiated Materials-2000 , 2000 , R3.5
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1. Gibson, J. B., Goland, A. N., Milgram, M., and Vineyard, G. H., Phys. Rev. 120 (1960) 1229.Google Scholar
2. Averback, R. S., Rubia, T. Diaz de la, and Benedek, R., Nucl. Inst. and Meth. B33 (1988) 693.Google Scholar
3. Rubia, T. Diaz de la and Guinan, M. W., J. Nucl. Mater. 174 (1990) 151.Google Scholar
4. Foreman, A. J. E., Phythian, W. J., and English, C. A., Phil. Mag. A66 (1992) 571.Google Scholar
5. Calder, A. F. and Bacon, D. J., J. Nucl. Mater. 207 (1993) 25.Google Scholar
6. Bacon, D. J. and Rubia, T. Diaz de la, J. Nucl. Mater. 216 (1994) 275.Google Scholar
7. Phythian, W. J., Stoller, R. E., Foreman, A. J. E., Calder, A. F., and Bacon, D. J., J. Nucl. Mater. 223 (1995) 245.Google Scholar
8. Stoller, R. E., “Molecular Dynamics Simulations of High Energy Cascades in Iron,” Microstructure of Irradiated Materials, Symp. Proc. Vol. 373, Robertson, I. M., Rehn, L. E., Zinkle, S. J., and Phythian, W. J., Editors, Materials Research Society, Warrandale, PA, 1995, pp. 21–26.Google Scholar
9. Stoller, R. E., J. Nucl. Mater. 233–237 (1996) 999.Google Scholar
10. Stoller, R. E., Odette, G. R., and Wirth, B. D., J. Nucl. Mater. 251 (1997) 49.Google Scholar
11. Stoller, R. E., J. Nucl. Mater. 276 (1999) 22.Google Scholar
12. Stoller, R.E. and Calder, A. F., J. Nucl. Mater., 283–287 (2001) 746.Google Scholar
13. Stoller, R. E. and Greenwood, L. R., J. Nucl. Mater. 271 & 272 (1999) 57.Google Scholar
14. Robinson, M. T., “The Dependence of Radiation Effects on the Primary Recoil Energy,” Radiation-Induced Voids in Metals, Proc. of Int. Conf., Corbett, J. W. and Ianniello, L. C., Eds., CONF-710601, U.S. National Technical Information Service, Springfield, VA, 1972, pp.397–428.Google Scholar
15. Norgett, M. J., Robinson, M. T., and Torrens, I. M., Nucl. Eng. and Des. 33 (1975) 50.Google Scholar
16. ASTM E521, Standard Practice for Neutron Radiation Damage Simulation by Charged-Particle Irradiation, Annual Book of ASTM Standards, Vol. 12.02, American Society of Testing and Materials, West Conshohocken, PA.Google Scholar
17. Bacon, D. J., Calder, A. F., Harder, J. M., and Wooding, S. J., J. Nucl. Mater. 205 (1993) 52.Google Scholar