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Detection of Near-Surface 52Cr Segregation in Irradiated 51V(Cr) By Rbs*

  • L. E. Rehn (a1) and P. M. Baldo (a1)

Abstract

Irradiation at elevated temperatures of V(Cr) alloys is known to create a near-surface layer of nonequilibrium Cr enrichment. Highly reproducible RBS spectra were accumulated from a V-15%Cr alloy irradiated at 750°C, and from unirradiated portions of the same specimen. Differences between these spectra are used to demonstrate the high sensitivity of conventional RBS techniques for determining near-surface segregation behavior. Sensitivities obtained utilizing differences in the acquired spectra are much higher than those typically assumed for RBS measurements. Using 1.8 MeV 4He, and conventional RBS equipment and scattering geometries, segregation of < two atomic layers of 52Cr in 51V- 15at.%Cr over a depth of ∼5 nm has been observed.

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Work supported by the U. S. Department of Energy, BES-Materials Sciences, under Contract W-31-109-Eng-38.

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References

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1. Rehn, L. E. and Okamoto, P. R. in Phase Stability During Irradiation, Nolfi, F. V. Jr., ed. (Applied Science, Essex, U.K., 1983) 247.
2. Backscattering Spectrometry, Chu, W-K, Mayer, J. W. and Nicolet, M-A. (Academic Press, New York, 1978).
3. Rehn, L. E., Averback, R. S. and Okamoto, P. R. in Advanced Techniques for Characterizing Microstructures, Wiffen, F. W. and Spitznagel, J. A., eds. (AIME, Warrendale, PA, 1982) p. 269.
4. Averback, R. S., Rehn, L E., Wagner, W., Wiedersich, H. and Okamoto, P. R., Phys. Rev. B28, 3100 (1983).
5. Wagner, W., Rehn, L. E., Wiedersich, H. and Naundorf, V., Phys. Rev. B28, 6780 (1983).
6. Carlson, O. N., Eash, D. T. and Eustice, A. L. in Reactive Metals, Clough, W. R., ed. (Interscience Publishers, New York, 1959) 277.
7.PINTO was written by Benedek, R.; a description can be found in Averback, R. S., Benedek, R. and Merkle, K. L., Phys. Rev. B18, 4156 (1978).
8. Biersack, J. P. and Haggmark, L. G., Nucl. Inst. and Meth. B7/8, 257 (1980).
9. Rehn, L. E., Okamoto, P. R., Potter, D. I. and Wiedersich, H., J. Nucl. Mater. 85 & 86, 763 (1979).
10. Ziegler, J. F., Lever, R. F. and Hirvonen, J. K. in Ion Beam Surface Layer Analysis, Meyer, O., Linker, G. and Koppeler, F., eds. (Plenum Press, New York, 1975) 163.
11. Rehn, L. E. and Baldo, P. M., to be published.

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