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Transformation induced plasticity in ceramics

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dc.contributor.authorFocht, Eric M.en
dc.contributor.committeechairReynolds, William T. Jr.en
dc.contributor.committeememberBrown, Jesse J. Jr.en
dc.contributor.committeememberDesu, Seshu B.en
dc.contributor.committeememberHirschfeld, Deidre A.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T21:52:18Zen
dc.date.adate2009-12-23en
dc.date.available2014-03-14T21:52:18Zen
dc.date.issued1992-04-15en
dc.date.rdate2009-12-23en
dc.date.sdate2009-12-23en
dc.description.abstractTransformation induced plasticity was investigated in a model ceramic. The effect upon toughness of the martensitic transformation from the cubic (paraelectric) to the tetragonal ( ferroelectric) phase in BaTiO3 was determined. The K1C fracture toughness, as measured by the hardness indentation technique, exhibits a maximum within a temperature range approximately 50°C above the stress-free transformation temperature. Unlike the martensitic transformation associated with partially stabilized zirconia, there is no volume change during the cubic-to-tetragonal phase change in BaTi03. In addition, no evidence of microcracking was observed. The enhanced toughness in the vicinity of the transition temperature was attributed to limited plasticity at crack tips provided by the transformation shear strains. The effective strains at the crack tips required to produce the observed fracture toughness values are consistent with transformation strains calculated using the phenomenological theory of martensite.en
dc.description.degreeMaster of Scienceen
dc.format.extentvi, 66 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-12232009-020415en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12232009-020415/en
dc.identifier.urihttp://hdl.handle.net/10919/46389en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1992.F623.pdfen
dc.relation.isformatofOCLC# 26033542en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1992.F623en
dc.subject.lcshCeramics -- Plastic propertiesen
dc.subject.lcshMartensitic transformationsen
dc.titleTransformation induced plasticity in ceramicsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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