Double minimum creep in the rafting regime of a single-crystal Co-base superalloy

Xue F, Zenk C, Freund L, Hoelzel M, Neumeier S, Göken M (2018)


Publication Status: Published

Publication Type: Journal article

Publication year: 2018

Journal

Publisher: PERGAMON-ELSEVIER SCIENCE LTD

Book Volume: 142

Pages Range: 129-132

DOI: 10.1016/j.scriptamat.2017.08.039

Abstract

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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APA:

Xue, F., Zenk, C., Freund, L., Hoelzel, M., Neumeier, S., & Göken, M. (2018). Double minimum creep in the rafting regime of a single-crystal Co-base superalloy. Scripta Materialia, 142, 129-132. https://dx.doi.org/10.1016/j.scriptamat.2017.08.039

MLA:

Xue, Fei, et al. "Double minimum creep in the rafting regime of a single-crystal Co-base superalloy." Scripta Materialia 142 (2018): 129-132.

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