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In Situ Investigation of TCP Phase Formation, Stress Relaxation and γ/γ′ Lattice Misfit Evolution in Fourth Generation Single Crystal Ni-Base Superalloys by X-Ray High Temperature Diffraction

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cam.issuedOnline2022-05-15
dc.contributor.authorBezold, A
dc.contributor.authorStone, HJ
dc.contributor.authorRae, CMF
dc.contributor.authorNeumeier, S
dc.contributor.orcidNeumeier, S [0000-0001-7853-0368]
dc.date.accessioned2022-07-05T15:01:00Z
dc.date.available2022-07-05T15:01:00Z
dc.date.issued2022
dc.date.submitted2022-03-08
dc.date.updated2022-07-05T15:00:59Z
dc.descriptionFunder: Friedrich-Alexander-Universität Erlangen-Nürnberg (1041)
dc.description.abstract<jats:title>Abstract</jats:title> <jats:p>In nickel-based superalloys, the lattice misfit between the <jats:italic>γ</jats:italic> and <jats:italic>γ</jats:italic>′ phases and the propensity to TCP phase formation at service temperatures critically influence the microstructural evolution that takes place and hence the resultant mechanical properties. In this work, the lattice misfits of a series of highly alloyed Ru-containing 4th generation Ni-base superalloys are investigated by <jats:italic>in situ</jats:italic> X-ray diffraction (XRD) at high temperature. While the lattice misfit values of all alloys range between − 0.3 and − 1.3 pct at room temperature, they show an atypical temperature dependence, becoming less negative above 900 °C. <jats:italic>In situ</jats:italic> XRD measurements at 1100 °C reveal that the majority of the internal coherency stresses are already relieved after two hours. This is particularly pronounced for the alloys that have both a lattice misfit larger than |0.6| pct at 1100 °C and are prone to TCP phase formation. However, throughout the relaxation of the internal coherency stresses the lattice misfit remains fairly constant. Due to the similar chemical compositions of the alloys studied, qualitative guidelines for an optimum lattice misfit magnitude are developed by comparing the lattice misfit values with previous creep experiments. Our results indicate that no universal optimal lattice misfit value exists for these alloys and the value strongly depends on the applied creep conditions.</jats:p> <jats:p> <jats:bold>Graphical Abstract</jats:bold> </jats:p>
dc.identifier.doi10.17863/CAM.86192
dc.identifier.eissn1543-1940
dc.identifier.issn1073-5623
dc.identifier.others11661-022-06713-2
dc.identifier.other6713
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/338785
dc.languageen
dc.language.isoeng
dc.publisherSpringer Science and Business Media LLC
dc.publisher.urlhttp://dx.doi.org/10.1007/s11661-022-06713-2
dc.subject40 Engineering
dc.subject4016 Materials Engineering
dc.subject4017 Mechanical Engineering
dc.titleIn Situ Investigation of TCP Phase Formation, Stress Relaxation and γ/γ′ Lattice Misfit Evolution in Fourth Generation Single Crystal Ni-Base Superalloys by X-Ray High Temperature Diffraction
dc.typeArticle
dcterms.dateAccepted2022-05-04
prism.endingPage2901
prism.issueIdentifier8
prism.publicationNameMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
prism.startingPage2890
prism.volume53
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1007/s11661-022-06713-2

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