Evolution of dislocation structure during inverse creep of a nickel aluminide: Ni–23.5 Al–0.5 Hf–0.2B (at. %)
- 1 August 1988
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 3 (4) , 651-655
- https://doi.org/10.1557/jmr.1988.0651
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.Keywords
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