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Point Defect Cluster Formation in Iron Displacement Cascades UP to 50 keV

Published online by Cambridge University Press:  15 February 2011

Roger E. Stoller
Roger E. Stoller*
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6376, USA, rkn@ornl.gov
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Abstract

The results of molecular dynamics displacement cascade simulations in iron at energies up to 50 keV and temperatures of 100, 600, and 900K are summarized, with a focus on the characterization of interstitial and vacancy clusters that are formed directly within the cascade. The fraction of the surviving point defects contained in clusters, and the size distributions of these in-cascade clusters have been determined. Although the formation of true vacancy clusters appears to be inhibited in iron, a significant degree of vacancy site correlation was observed. These well correlated arrangements of vacancies can be considered nascent clusters, and they have been observed to coalesce during longer term Monte Carlo simulations which permit short range vacancy diffusion. Extensive interstitial clustering was observed. The temperature and cascade energy dependence of the cluster size distributions are discussed in terms of their relevance to microstructural evolution and mechanical property changes in irradiated iron-based alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 540: Symposium N / Microstructural Processes in Irradiated Materials , 1998 , 679
Copyright
Copyright © Materials Research Society 1999

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References

1. Averback, R. S., Rubia, T. Diaz de la, and Benedek, R., Nucl. Inst. and Meth. B33, 693 (1988).Google Scholar
2. Foreman, A. J. E., Phythian, W. J., and English, C. A., Phil. Mag. A66, 571 (1992).Google Scholar
3. Calder, A. F. and Bacon, D. J., J. Nucl. Mater 207, 25 (1993).Google Scholar
4. Bacon, D. J. and Rubia, T. Diaz de la, J. Nucl. Mater 216, 275 (1994).Google Scholar
5. Phythian, W. J., Stoller, R. E., Foreman, A. J. E., Calder, A. F., and Bacon, D. J., J. Nucl. Mater 223, 245 (1995).Google Scholar
6. Stoller, R. E., Microstructure of Irradiated Materials, Mat. Res. Soc. Symp. Proc. Vol. 373, Materials Research Society, Warrandale, PA, 1995, pp. 21–26.Google Scholar
7. Bacon, D. J., Calder, A. F., Gao, F., Kapinos, V. G., and Wooding, S. J., Nucl. Inst. and Meth. B102, 37 (1995).Google Scholar
8. Stoller, R. E., JOM (formerly Journal of Metals) 48, 23 (1996).Google Scholar
9. Stoller, R. E., Odette, G. R., and Wirth, B. D., J. Nucl. Mater 251, 49 (1997).Google Scholar
10. Finnis, M. W., “MOLDY6-A Molecular Dynamics Program for Simulation of Pure Metals,” AERE R-13182, UK AEA Harwell Laboratory (1988).Google Scholar
11. Finnis, M. W. and Sinclair, J. E., Phil. Mag. A50, 45 (1984) and Erratum, Phil. Mag. A53, 161 (1986).Google Scholar
12. Gao, F., Bacon, D. J., Flewitt, P. E. J., and Lewis, T. A., J. Nucl. Mater 249, 77 (1997).Google Scholar
13. Norgett, M. J., Robinson, M. T., and Torrens, I. M., Nucl. Eng. and Des. 33, 50 (1975).Google Scholar
14. Stoller, R. E. and Greenwood, L. R., “From Molecular Dynamics to Kinetic Rate Theory: A Simple Example of Multiscale Modeling,” these proceedings.Google Scholar
15. Stoller, R. E., “Primary Defect Formation in bcc Iron: The Role of Cascade Energy and Temperature and Pre-existing Defects,” presented at the International Workshop: Basic Aspects of Differences in Irradiation Effects Between fcc, bcc, and hcp Metals and Alloys, Cangas de Onis, Spain, 15-20 October 1998, to be submitted to J. Nucl. Mater.Google Scholar
16. Wirth, B. D., “On the Character of Nano-scale Features in Reactor Pressure Vessel Steels Under Neutron Irradiation,” Ph. D. Dissertation, University of California, Santa Barbara (1998).Google Scholar
17. Wirth, B. D. and Odette, G. R., “Kinetic Lattice Monte Carlo Simulations of Cascade Aging in Iron and Dilute Iron-Copper Alloys,” these proceedings.Google Scholar