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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

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