Creep behavior of a γ′-strengthened Co-base alloy with zero γ/γ′-lattice misfit at 800 °C, 196 MPa

dc.contributor.authorMidtlyng, Jan
dc.contributor.authorEpishin, Alexander I.
dc.contributor.authorPetrushin, Nikolay V.
dc.contributor.authorLink, Thomas
dc.contributor.authorNolze, Gert
dc.contributor.authorSvetlov, Igor L.
dc.contributor.authorReimers, Walter
dc.date.accessioned2019-02-11T17:20:52Z
dc.date.available2019-02-11T17:20:52Z
dc.date.issued2017
dc.descriptionDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.de
dc.descriptionThis publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.en
dc.description.abstractDeformation and structural behavior of an experimental γ′-strengthened Co-base alloy during creep at 800 °C and 196 MPa have been investigated. The characteristic features of this alloy are zero γ/γ′-lattice misfit and a fine γ/γ′-microstructure. In the initial condition, the γ′-precipitates in this alloy are small (size of about 100 nm), have polyhedral morphology, and are separated by the very narrow γ-channels (width of about 10 nm). The tests performed up to about 1% creep strain (about 500 h creep time) gave creep curves with a slow constant strain rate and without an apparent transient creep, typical for superalloys with nonzero misfit. In this initial stage of creep, entering of the narrow γ-channels by dislocations is blocked by a strong Orowan force. The micromechanism of creep was identified as an octahedral glide of 〈011〉 superdislocations simultaneously in two phases, γ and γ′. The γ/γ′-microstructure with zero misfit shows no rafting but rapidly coarsens isotropically. It is concluded that zero misfit is beneficial at the initial stages of the creep but is unfavourable for long-term creep because of the continuous microstructural coarsening.en
dc.identifier.eissn2044-5326
dc.identifier.issn0884-2914
dc.identifier.urihttps://depositonce.tu-berlin.de//handle/11303/9091
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-8192
dc.language.isoen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc670 Industrielle Fertigungde
dc.titleCreep behavior of a γ′-strengthened Co-base alloy with zero γ/γ′-lattice misfit at 800 °C, 196 MPaen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1557/jmr.2017.424
dcterms.bibliographicCitation.issue24
dcterms.bibliographicCitation.journaltitleJournal of Materials Researchen
dcterms.bibliographicCitation.originalpublishernameCambridge University Pressen
dcterms.bibliographicCitation.pageend4474
dcterms.bibliographicCitation.pagestart4466
dcterms.bibliographicCitation.volume32
tub.accessrights.dnbdomain
tub.affiliationFak. 3 Prozesswissenschaften>Inst. Werkstoffwissenschaften und -technologien>FG Metallische Werkstoffede
tub.affiliation.facultyFak. 3 Prozesswissenschaftende
tub.affiliation.groupFG Metallische Werkstoffede
tub.affiliation.instituteInst. Werkstoffwissenschaften und -technologiende
tub.publisher.universityorinstitutionTechnische Universität Berlinde
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