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dc.rights.licenseCC BY-NC-SA 3.0 Unportedeng
dc.contributor.authorKaufmann, S.
dc.contributor.authorNiemann, R.
dc.contributor.authorThersleff, T.
dc.contributor.authorRößler, U.K.
dc.contributor.authorHeczko, O.
dc.contributor.authorBuschbeck, J.
dc.contributor.authorHolzapfel, B.
dc.contributor.authorSchultz, L.
dc.contributor.authorFähler, S.
dc.date.accessioned2018-06-12T04:44:01Z
dc.date.available2019-06-28T12:39:59Z
dc.date.issued2011
dc.identifier.urihttps://doi.org/10.34657/1600-
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/4372
dc.description.abstractDiffusionless phase transitions are at the core of the multifunctionality of (magnetic) shape memory alloys, ferroelectrics and multiferroics. Giant strain effects under external fields are obtained in low symmetric modulated martensitic phases. We outline the origin of modulated phases, their connection with tetragonal martensite and consequences owing to their functional properties by analysing the martensitic microstructure of epitaxial Ni–Mn–Ga films from the atomic to the macroscale. Geometrical constraints at an austenite–martensite phase boundary act down to the atomic scale. Hence, a martensitic microstructure of nanotwinned tetragonal martensite can form. Coarsening of twin variants can reduce twin boundary energy, a process we could observe from the atomic to the millimetre scale. Coarsening is a fractal process, proceeding in discrete steps by doubling twin periodicity. The collective defect energy results in a substantial hysteresis, which allows the retention of modulated martensite as a metastable phase at room temperature. In this metastable state, elastic energy is released by the formation of a 'twins within twins' microstructure that can be observed from the nanometre to the millimetre scale. This hierarchical twinning results in mesoscopic twin boundaries. Our analysis indicates that mesoscopic boundaries are broad and diffuse, in contrast to the common atomically sharp twin boundaries of tetragonal martensite. We suggest that the observed extraordinarily high mobility of such mesoscopic twin boundaries originates from their diffuse nature that renders pinning by atomistic point defects ineffective.eng
dc.formatapplication/pdf
dc.language.isoengeng
dc.publisherMilton Park : Taylor & Franciseng
dc.relation.ispartofseriesNew Journal of Physics, Volume 13eng
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/3.0/eng
dc.subjectAtomic scaleeng
dc.subjectDefect energyeng
dc.subjectDiscrete stepeng
dc.subjectElastic energyeng
dc.subjectExternal fieldseng
dc.subjectFunctional propertieseng
dc.subjectGeometrical constraintseng
dc.subjectGiant straineng
dc.subjectHigh mobilityeng
dc.subjectMacro scaleeng
dc.subjectMartensitic microstructureeng
dc.subjectMartensitic phasiseng
dc.subjectMesoscopicseng
dc.subjectMeta-stable stateeng
dc.subjectMetastable phaseeng
dc.subjectModulated phasiseng
dc.subjectMultiferroicseng
dc.subjectMultifunctionalityeng
dc.subjectNanometreseng
dc.subjectNi-Mn-GaRoom temperatureeng
dc.subjectShape memory alloyeng
dc.subjectTwin boundarieseng
dc.subjectTwin boundary energyeng
dc.subject.ddc530eng
dc.titleModulated martensite: Why it forms and why it deforms easilyeng
dc.typearticleeng
dc.typeTexteng
dc.description.versionpublishedVersioneng
wgl.contributorIFWDeng
wgl.subjectPhysikeng
wgl.typeZeitschriftenartikeleng
dc.relation.doihttps://doi.org/10.1088/1367-2630/13/5/053029
dcterms.bibliographicCitation.journalTitleNew Journal of Physicseng
tib.accessRightsopenAccesseng
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Kaufmann, S., R. Niemann, T. Thersleff, U.K. Rößler, O. Heczko, J. Buschbeck, B. Holzapfel, L. Schultz and S. Fähler, 2011. Modulated martensite: Why it forms and why it deforms easily. 2011. Milton Park : Taylor & Francis
Kaufmann, S., Niemann, R., Thersleff, T., Rößler, U. K., Heczko, O., Buschbeck, J., Holzapfel, B., Schultz, L. and Fähler, S. (2011) “Modulated martensite: Why it forms and why it deforms easily.” Milton Park : Taylor & Francis. doi: https://doi.org/10.1088/1367-2630/13/5/053029.
Kaufmann S, Niemann R, Thersleff T, Rößler U K, Heczko O, Buschbeck J, Holzapfel B, Schultz L, Fähler S. Modulated martensite: Why it forms and why it deforms easily. Milton Park : Taylor & Francis; 2011.
Kaufmann, S., Niemann, R., Thersleff, T., Rößler, U. K., Heczko, O., Buschbeck, J., Holzapfel, B., Schultz, L., & Fähler, S. (2011). Modulated martensite: Why it forms and why it deforms easily (Version publishedVersion). Version publishedVersion. Milton Park : Taylor & Francis. https://doi.org/https://doi.org/10.1088/1367-2630/13/5/053029
Kaufmann S, Niemann R, Thersleff T, Rößler U K, Heczko O, Buschbeck J, Holzapfel B, Schultz L, Fähler S. Modulated martensite: Why it forms and why it deforms easily. Published online 2011. doi:https://doi.org/10.1088/1367-2630/13/5/053029


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