Journal
ACTA MATERIALIA
Volume 61, Issue 8, Pages 2926-2943Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.01.052
Keywords
Superalloy single crystals; Creep anisotropy; Rafting; Dislocations; Deformation mechanisms
Funding
- Project A1 of the collaborative research centre SFB/Transregio [103]
- Project A2 of the collaborative research centre SFB/Transregio [103]
- DFG
- MRD
- ICAMS
- Bundesanstalt fur Materialforschung und -prufung (BAM)
- CSF [202/09/2073]
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The high-temperature and low-stress creep (1293 K, 160 MPa) of the single-crystal Ni-based superalloy LEK 94 is investigated, comparing the tensile creep behavior of miniature creep specimens in [0 0 1] and [1 1 0] directions. In the early stages of creep, the [0 0 1]-direction loading shows higher minimum creep rates, because a greater number of microscopic crystallographic slip systems are activated, the dislocation networks at gamma/gamma' interfaces accommodate lattice misfit better, and gamma channels are wider. After the creep rate minimum, creep rates increase more strongly as a function of strain for [1 1 0] tensile loading. This may be related to the nature of rafting during [1 1 0] tensile creep, which results in a more open topology of the gamma channels. It may also be related to more frequent gamma' cutting events compared with [1 0 0] tensile creep. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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