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Evolution of dislocation structure during inverse creep of a nickel aluminide: Ni–23.5 Al–0.5 Hf–0.2B (at. %)

Published online by Cambridge University Press:  31 January 2011

J. H. Schneibel  and
J. A. Horton
J. H. Schneibel
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
J. A. Horton
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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Abstract

A well-annealed polycrystalline nickel aluminide of composition Ni–23.5Al–0.5 Hf–0.2B (at. %) shows inverse creep behavior at 1033 K and 250 MPa. The minimum creep rate does not correspond to a steady-state creep condition. The increase in the creep rate with strain and time is accompanied by an increase in the volume fraction of dislocation-containing regions. The inverse transient can be eliminated by prestraining at room temperature. It is absent in the diffusional creep regime.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 4 , August 1988 , pp. 651 - 655
Copyright
Copyright © Materials Research Society 1988

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