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Positron Annihilation Spectroscopy and Small Angle Neutron Scattering Characterization of Nanostructural Features in Irradiated Fe-Cu-Mn Alloys

Published online by Cambridge University Press:  21 March 2011

B. D. Wirth
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551
P. Asoka-Kumar
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551
R. H. Howell
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551
G. R. Odette
Affiliation:
University of California, Santa Barbara, Santa Barbara, CA 93106
P. A. Sterne
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551
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Abstract

Radiation embrittlement of nuclear reactor pressure vessel steels results from a high number density of nanometer sized Cu-Mn-Ni rich precipitates (CRPs) and sub-nanometer matrix features, thought to be vacancy-solute cluster complexes (VSC). However, questions exist regarding both the composition of the precipitates and the defect character and composition of the matrix features. We present results of positron annihilation spectroscopy (PAS) and small angle neutron scattering (SANS) characterization of irradiated and thermally aged Fe-Cu and Fe-Cu-Mn alloys. These complementary techniques provide insight into the composition and character of both types of nanoscale features. The SANS measurements indicate populations of CRPs and VSCs in both alloys. The CRPs are coarser in the Fe-Cu alloy and the number densities of CRP and VSC increase with the addition of Mn. The PAS involved measuring both the positron lifetimes and the Doppler broadened annihilation spectra in the high momentum region to provide elemental sensitivity at the annihilation site. The spectra in Fe-Cu-Mn specimens thermally aged to peak hardness at 450°C and irradiated at 288°C are nearly identical to elemental Cu. Positron lifetime and spectrum measurements in Fe-Cu specimens irradiated at 288°C clearly show the existence of long lifetime (∼500 ps) open volume defects, which also contain Cu. Thus the SANS and PAS provide a self-consistent picture of nanostructures composed of CRPs and VSCs and tend to discount high Fe concentrations in the CRPs.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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References

1. Odette, G. R., Scripta Met. 11, (1983) 1183.CrossRefGoogle Scholar
2. Odette, G. R., MRS Soc. Symp. Proc. 373, (1995) 137.CrossRefGoogle Scholar
3. Pareige, P. and Miller, M. K., App. Surf. Sci. 94/95, (1996) 370.CrossRefGoogle Scholar
4. Miller, M. K., Pareige, P. and Burke, M. G., Materials Characterization, 44, (2000) 235.CrossRefGoogle Scholar
5. Pareige, P., PhD Dissertation, Rouen University (1994).Google Scholar
6. Beaven, P. A., Frisius, F., Kampmann, R., Wagner, R., and Hawthorne, J. R., ASTM-STP1011, American Society for Testing and Materials, Philadelphia, PA (1989) 243.Google Scholar
7. Odette, G. R. and Lucas, G. E., Radiation Effects & Defects in Solids 144, (1998) 189.CrossRefGoogle Scholar
8. Mader, E. V., Ph.D. Dissertation, University of California Santa Barbara (1995).Google Scholar
9. Wirth, B. D., Ph.D. Dissertation, University of California, Santa Barbara (1998).Google Scholar
10. Eason, E. D., Wright, J. E., and Odette, G. R., Improved Embrittlement Correlations for Reactor Pressure Vessel Steels, NUREG/CR-6551, (1998).CrossRefGoogle Scholar
11. Odette, G. R. and Wirth, B. D., J. Nucl. Mater. 251, (1997) 157.CrossRefGoogle Scholar
12. Odette, G. R., Liu, C. L. and Wirth, B. D., MRS Symp. Proc. 439, (1997) 457.CrossRefGoogle Scholar
13. Puska, M.J., Lanki, P. and Niemen, R. M., J. Phys. Condens. Matter 1, (1989) 6081.CrossRefGoogle Scholar
14. Glinka, C. J., Rowe, J. M. and laRock, J. G., J. of Applied Crystallography 19, (1986) 427.CrossRefGoogle Scholar
15. Howell, R.H., Sterne, P.A., Hartley, J., Cowan, T.E., Appl. Surf. Sci. 149, (1999) 103.CrossRefGoogle Scholar
16. Asoka-Kumar, P., Alatalo, M., Ghosh, V. J., Kruseman, A. C., Nielsen, B. and Lynn, K. G., Phys. Rev. Letters 77, (1996) 2097.CrossRefGoogle Scholar
17. Nagai, Y., M Hasegawa, Tang, Z., Hempel, A., Yubata, K., Shimamura, T., Kawazoe, Y., Kawai, A. and Kano, F., Phys. Rev. B 61, (2000) 6574.CrossRefGoogle Scholar

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Positron Annihilation Spectroscopy and Small Angle Neutron Scattering Characterization of Nanostructural Features in Irradiated Fe-Cu-Mn Alloys
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Positron Annihilation Spectroscopy and Small Angle Neutron Scattering Characterization of Nanostructural Features in Irradiated Fe-Cu-Mn Alloys
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Positron Annihilation Spectroscopy and Small Angle Neutron Scattering Characterization of Nanostructural Features in Irradiated Fe-Cu-Mn Alloys
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