Structural refinement of neutron powder diffraction data of two-stage martensitic phase transformations in Ti50.75Ni47.75Fe1.50 shape memory alloy

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dc.contributorVirginia Techen
dc.contributor.authorSitepu, H.en
dc.contributor.departmentGeosciencesen
dc.date.accessed2014-07-15en
dc.date.accessioned2014-07-21T15:49:43Zen
dc.date.available2014-07-21T15:49:43Zen
dc.date.issued2007-09en
dc.description.abstractTransformation behaviors of the technologically important polycrystalline Ti50.75Ni47.75Fe1.50 shape memory alloy were investigated using differential scanning calorimeter (DSC) and powder diffraction techniques. DSC revealed that there are two-stage (i.e., cubic -> trigonal -> monoclinic) martensitic phase transformations on cooling and a one-step transformation (monoclinic -> cubic) on heating. In situ structural refinement of cubic -> trigonal -> monoclinic on cooling was carried out using the D1A high-resolution neutron powder diffractometer at the Institut Laue-Langevin Neutrons for Science in Grenoble, France. Results showed that the phases involved during the phase transition are consistent with the differential scanning calorimeter cooling curve, and the refined crystal structure parameters obtained from Rietveld refinements with the generalized spherical harmonic description agreed reasonably well with X-ray single-crystal data. Subsequently, a combined neutron and synchrotron structural refinement for each phase was conducted because the trial refinements initially using only the synchrotron data of trigonal phase yielded a false minimum with a somewhat high goodness-of-fit chi(2). Results obtained from the combined neutron and synchrotron data of the cubic, trigonal, and monoclinic phases show that the same minimum goodness-of-fit indices were always obtained. (C) 2007 International Centre for Diffraction Data.en
dc.description.sponsorshipCOMPRES under NSF Cooperative Agreement No. EAR 01-35554en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSitepu, H., "Structural refinement of neutron powder diffraction data of two-stage martensitic phase transformations in Ti50.75Ni47.75Fe1.50 shape memory alloy," Powder Diffr., Vol. 22, 2007. DOI: 10.1154/1.2754715en
dc.identifier.doihttps://doi.org/10.1154/1.2754715en
dc.identifier.issn0885-7156en
dc.identifier.urihttp://hdl.handle.net/10919/49653en
dc.identifier.urlhttp://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8503278&fulltextType=RA&fileId=S0885715600004176en
dc.language.isoenen
dc.publisherCambridge University Pressen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectneutron powder diffractionen
dc.subjectgeneralized spherical harmonicen
dc.subjectshape memoryen
dc.subjectalloyen
dc.subjectti-nien
dc.subjectmartensitic transformationen
dc.subjectquantitative texture analysisen
dc.subjectpreferred orientationen
dc.subjectr-phaseen
dc.subjectrietvelden
dc.subjectrefinementen
dc.subjectcrystal-structureen
dc.subjectpercent-nien
dc.subjectintensitiesen
dc.subjectsynchrotronen
dc.subjectmolybditeen
dc.subjectmarchen
dc.subjectmaterials science, characterization & testingen
dc.titleStructural refinement of neutron powder diffraction data of two-stage martensitic phase transformations in Ti50.75Ni47.75Fe1.50 shape memory alloyen
dc.title.serialPowder Diffractionen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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