Unique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained Fe-31Mn-3Al-3Si alloy

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dc.contributor.authorBai, Yuen
dc.contributor.authorKitamura, Hirokien
dc.contributor.authorGao, Sien
dc.contributor.authorTian, Yanzhongen
dc.contributor.authorPark, Nokeunen
dc.contributor.authorPark, Myeong-heom H.en
dc.contributor.authorAdachi, Hirokien
dc.contributor.authorShibata, Akinobuen
dc.contributor.authorSato, Masuguen
dc.contributor.authorMurayama, Mitsuhiroen
dc.contributor.authorTsuji, Nobuhiroen
dc.date.accessioned2022-02-10T12:10:22Zen
dc.date.available2022-02-10T12:10:22Zen
dc.date.issued2021-08-05en
dc.date.updated2022-02-10T12:10:19Zen
dc.description.abstractTensile mechanical properties of fully recrystallized TWIP steel specimens having various grain sizes (d) ranging from 0.79 μm to 85.6 μm were investigated. It was confirmed that the UFG specimens having the mean grain sizes of 1.5 μm or smaller abnormally showed discontinuous yielding characterized by a clear yield-drop while the specimens having grain sizes larger than 2.4 μm showed normal continuous yielding. In-situ synchrotron radiation XRD showed dislocation density around yield-drop in the UFG specimen quickly increased. ECCI observations revealed the nucleation of deformation twins and stacking faults from grain boundaries in the UFG specimen around yielding. Although it had been conventionally reported that the grain refinement suppresses deformation twinning in FCC metals and alloys, the number density of deformation twins in the 0.79 μm grain-sized specimen was much higher than that in the specimens with grain sizes of 4.5 μm and 15.4 μm. The unusual change of yielding behavior from continuous to discontinuous manner by grain refinement could be understood on the basis of limited number of free dislocations in each ultrafine grain. The results indicated that the scarcity of free dislocations in the recrystallized UFG specimens changed the deformation and twinning mechanisms in the TWIP steel.en
dc.description.versionPublished versionen
dc.format.extent15 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN 15870 (Article number)en
dc.identifier.doihttps://doi.org/10.1038/s41598-021-94800-6en
dc.identifier.eissn2045-2322en
dc.identifier.issn2045-2322en
dc.identifier.issue1en
dc.identifier.orcidMurayama, Mitsuhiro [0000-0003-1965-4891]en
dc.identifier.other10.1038/s41598-021-94800-6 (PII)en
dc.identifier.pmid34354093en
dc.identifier.urihttp://hdl.handle.net/10919/108249en
dc.identifier.volume11en
dc.language.isoenen
dc.publisherNature Portfolioen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000684433100010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectHALL-PETCH RELATIONSHIPen
dc.subjectX-RAY-DIFFRACTIONen
dc.subjectHYDROGEN EMBRITTLEMENT BEHAVIORSen
dc.subjectMANGANESE AUSTENITIC STEELen
dc.subjectSEVERE PLASTIC-DEFORMATIONen
dc.subjectTENSILE DEFORMATIONen
dc.subjectTWIP-STEELen
dc.subjectFRICTION STRESSen
dc.subjectSIZEen
dc.subjectDUCTILITYen
dc.titleUnique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained Fe-31Mn-3Al-3Si alloyen
dc.title.serialScientific Reportsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
dcterms.dateAccepted2021-07-15en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/Materials Science and Engineeringen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen

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