A correlation between grain boundary character and deformation twin nucleation mechanism in coarse-grained high-Mn austenitic steel

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dc.contributor.authorHung, Chang-Yuen
dc.contributor.authorBai, Yuen
dc.contributor.authorShimokawa, Tomotsuguen
dc.contributor.authorTsuji, Nobuhiroen
dc.contributor.authorMurayama, Mitsuhiroen
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2021-08-13T17:10:14Zen
dc.date.available2021-08-13T17:10:14Zen
dc.date.issued2021-04-19en
dc.date.updated2021-08-13T17:10:10Zen
dc.description.abstractIn polycrystalline materials, grain boundaries are known to be a critical microstructural component controlling material’s mechanical properties, and their characters such as misorientation and crystallographic boundary planes would also influence the dislocation dynamics. Nevertheless, many of generally used mechanistic models for deformation twin nucleation in fcc metal do not take considerable care of the role of grain boundary characters. Here, we experimentally reveal that deformation twin nucleation occurs at an annealing twin (Σ3{111}) boundary in a high-Mn austenitic steel when dislocation pile-up at Σ3{111} boundary produced a local stress exceeding the twining stress, while no obvious local stress concentration was required at relatively high-energy grain boundaries such as Σ21 or Σ31. A periodic contrast reversal associated with a sequential stacking faults emission from Σ3{111} boundary was observed by in-situ transmission electron microscopy (TEM) deformation experiments, proving the successive layer-by-layer stacking fault emission was the deformation twin nucleation mechanism, different from the previously reported observations in the high-Mn steels. Since this is also true for the observed high Σ-value boundaries in this study, our observation demonstrates the practical importance of taking grain boundary characters into account to understand the deformation twin nucleation mechanism besides well-known factors such as stacking fault energy and grain size.en
dc.description.versionPublished versionen
dc.format.extent13 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN 8468 (Article number)en
dc.identifier.doihttps://doi.org/10.1038/s41598-021-87811-wen
dc.identifier.eissn2045-2322en
dc.identifier.issn2045-2322en
dc.identifier.issue1en
dc.identifier.orcidMurayama, Mitsuhiro [0000-0003-1965-4891]en
dc.identifier.other10.1038/s41598-021-87811-w (PII)en
dc.identifier.pmid33875690 (pubmed)en
dc.identifier.urihttp://hdl.handle.net/10919/104638en
dc.identifier.volume11en
dc.language.isoenen
dc.publisherNature Researchen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000642580700002&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.subjectLATTICE DISLOCATIONSen
dc.subjectBICRYSTAL INTERFACESen
dc.subjectTENSILE PROPERTIESen
dc.subjectSLIP TRANSMISSIONen
dc.subjectFCC METALSen
dc.subjectPLASTICITYen
dc.subjectENERGYen
dc.subjectSIZEen
dc.subjectMICROSTRUCTUREen
dc.subjectCOINCIDENCEen
dc.titleA correlation between grain boundary character and deformation twin nucleation mechanism in coarse-grained high-Mn austenitic steelen
dc.title.serialScientific Reportsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
dcterms.dateAccepted2021-04-05en
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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