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The Effect of Bulk Boron Level on its Segregation to Grain Boundaries in Substoichiometric Ni3Al

Published online by Cambridge University Press:  26 February 2011

Ashok Choudhury ,
C.L. White  and
C.R. Brooks
Ashok Choudhury
Affiliation:
Div. of Mat. Sci. & Engr., Dept. Of Mech. Engr. Univ. Of California, Davis, CA 95616
C.L. White
Affiliation:
Department Of Metallurgical Engineering, Michigan Technological University, Houghton, MI 49931
C.R. Brooks
Affiliation:
Materials Science and Engineering Department, The University Of Tennessee, Knoxville, TN 37996-2200
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Abstract

It is well established that the grain boundary strength (and thus the ductility) of polycrystalline Ni3Al is a function of the level of boron segregated to su h boundaries. This paper presents some Auger Electron Spectroscopy (AES) results obtained as part of an extensive investigation into the details of this segregation behavior. Specifically, the level of segregated boron was obtained in three substoichiometric alloys containing 0.048, 0.24 and 0.48 at.% (100, 500 and 1000 wppm, respectively) boron in the bulk. This level was correlated with the accruing fracture morphology for samples subjected to widely different thermal histories. Using McLean's approach, these segregant levels were used to arrive at the effective binding energy of boron to such boundaries. The observed trend of decreasing effective binding energy with increasing bulk boron level is more consistent with a “spectrum of binding energies” model of grain boundary segregation than with the single binding energy model of McLean.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 261
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

1. Liu, C.T., White, C.L., and Horton, J.A., Acta Metall. 33(2)), 213–29 (1985).CrossRefGoogle Scholar
2. Aoki, K. and Izumi, O., Nippon Kinzoku Gakkaishi 43(12)), 1190–95 (1979).Google Scholar
3. Ogura, T., Hanada, S., Masumoto, T., and Izumi, O., Metall. Trans. A 16A, 441–43 (1985).CrossRefGoogle Scholar
4. Schulson, E.M., Weihs, T.P., Viens, D.V. and Baker, I., Acta Metall. 33(9)), 1587–91 (1985).Google Scholar
5. Briant, C.L. and Messmer, R.P., Acta Metall. 32(11)), 2043–52 (1984).Google Scholar
6. Eberhart, M.E., Latanision, R.M. and Johnson, K.H., Acta Metall. 33(10)), 1769–83 (1985).Google Scholar
7. McLean, D., Grain Boundaries in Metals, (Clarendon Press, Oxford, 1957) P. 116.Google Scholar
8. Rice, J.R. in Effect of Hydrogen on Behavior of Materials, edited by Thompson, A.W. and Bernstein, I.M., (AIME, New York, 1976) pp. 455–66.Google Scholar
9. White, C.L., Padgett, R.A., Liu, C.T., and Yalisove, S.M., Scripta Metall. 18, 1417–20 (1984).Google Scholar
10. White, C.L. and Choudhury, A., in “High Temperature Ordered Intermetallic Alloys”, MRS Symp. Proc., Vol. 81, 427–441 (1987).Google Scholar
11. White, C.L., Padgett, R.A. and Liu, C.T., Manuscript accepted for publication in Acta Metall.Google Scholar
12. Choudhury, A., White, C.L., and Brooks, C.R., Scr. Metall. 20(7)), 1061–66 (1986).CrossRefGoogle Scholar
13. Kuruvilla, A.K. and Stoloff, N.S., in “High Temperature Ordered Intermetallic Alloys” MRS Symp. Proc., Vol. 39, 229–238 (1985).Google Scholar
14. Davis, L.E., McDonald, N.C., Palmberg, P.W., Riach, G.E. and Weber, R.E., in “Handbook Of Auger Electron Spectroscopy”, Physical Electronics Industries (1976).Google Scholar
15. Choudhury, A., Ph.D. Dissertation, The Univ. of Tennessee, Knoxville, June 1987.Google Scholar
16. Bohn, H., Williams, J.M., Barrett, J.H. and Liu, C.T. in “High Temperature Ordered Intermetallic Alloys”, MRS Symp. Proc., Vol. 81, 127–133 (1987).Google Scholar
17. White, C.L. and Coghlan, W.A., Metall. Trans. A 8A, 1403–11, (1977).Google Scholar
18. White, C.L. and Stein, D.F., Metall. Trans. A 9A, 12–21, (1978).Google Scholar