Journal
SCRIPTA MATERIALIA
Volume 142, Issue -, Pages 129-132Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.08.039
Keywords
Co-base superalloys; Lattice misfit; Directional coarsening; Creep; Neutron diffraction
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB/TR 103]
- SinoGerman (CSC-DAAD) Postdoc Scholarship Program
- Alexander von Humboldt Foundation
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To investigate whether the formation of rafts in Co-base superalloys has a hardening or softening effect, the single crystal deformation behavior was studied in the high temperature/low stress creep regime. The large positive lattice misfit of the investigated Co-base superalloy led to a pronounced directional coarsening of the microstructure normal to the stress axis during compressive creep at 950 degrees C/150 MPa. Two creep minima were observed similar to Ni-base superalloys under tensile creep. Rafting was accompanied by a decreasing creep rate indicating a hardening effect, although cutting of gamma' rafts by partial dislocations under the formation of stacking faults occurred. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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