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Coble creep in a powder-metallurgical nickel aluminide of composition Ni–22.8Al–0.6Hf–0.1B (at. %)

Published online by Cambridge University Press:  31 January 2011

J. H. Schneibel  and
W. D. Porter
J. H. Schneibel
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
W. D. Porter
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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Abstract

Coble creep, which is controlled by mass transport along grain boundaries, has been identified in a powder-metallurgically prepared nickel aluminide with the nominal composition Ni–22.8Al–0.6Hf–0.1B (at. %). Diffusional creep rates ∊ as a function of temperature T, stress σ, and grain size L are well described by ∊ = 33δb Db Ωσ (kTL3), where δb Db = 3 × 10−6 m3 s−1 × exp [– (313 kJ/mol)/(RT) (δb is the diffusional grain boundary width, Db is the grain boundary diffusivity, R is the gas constant, and T is the absolute temperature). The activation energy of 313 kJ/mol is unusually high as compared to that for volume diffusion.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 3 , Issue 3 , June 1988 , pp. 403 - 406
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

1Proceedings of the Materials Research Society Symposium on High-Temperature Ordered Intermetallics, edited by Koch, C. C., Liu, C. T., and Stoloff, N. S. (Materials Research Society, Pittsburgh, PA, 1985), Vol. 39.Google Scholar
2Proceedings of the Materials Research Society Symposium on High-Temperature Ordered Intermetallic Alloys II, edited by Stoloff, N. S., Koch, C. C., Liu, C. T., and Izumi, O. (Materials Research Society, Pittsburgh, PA, 1987), Vol. 81.Google Scholar
3Liu, C. T. and White, C. L., in Ref. 1, p. 365.Google Scholar
4Liu, C. T., in Ref. 1, p. 355.Google Scholar
5Schneibel, J. H., Petersen, G. F., and Liu, C. T., J. Mater. Res. 1, 68 (1986).CrossRefGoogle Scholar
6Burton, B., Diffusional Creep in Polycrystalline Materials (Trans Tech Publications, Ohio, 1977), No. 5.Google Scholar
7Sikka, V. K. and Loria, E. A., in Nickel Metallurgy, Industrial Applications of Nickel (The Canadian Institute of Mining and Metallurgy, Montreal, Canada, 1986), Vol. 2, p. 293.Google Scholar
8Sikka, V. K., in the Proceedings of the First American Society for Metals Europe Technical Conference, Paris, 1987 (to be published).Google Scholar
9Raj, R. and Ashby, M. F., Metall. Trans. 2, 1113 (1971).CrossRefGoogle Scholar
10Spingarnand, J. R., Nix, W. D., Acta. Metall. 26, 1389 (1978).CrossRefGoogle Scholar
11Chou, T. C. and Chou, Y. T., in Ref. 1, p. 461.Google Scholar
12Schneibel, J. H. and Martinez, L., in Creep and Fracture of Engineering Materials and Structures, edited by Wilshire, B. and Evans, R. W. (The Institute of Metals, London, 1987), p. 203.Google Scholar
13Schneibel, J. H. and Martinez, L., in Ref. 2, p. 297.Google Scholar
14Hoshino, K., Rothman, S. J., and Averback, R. S., Acta Metall. (to be published).Google Scholar