Fabrication, microstructure and high-temperature plastic deformation of three-phase Al2O3/Er3Al5O12/ZrO2 sintered ceramics

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dc.contributor.authorHuamán-Mamani, F.A.
dc.contributor.authorJiménez-Holgado, C.
dc.contributor.authorJiménez-Melendo, M.
dc.date.accessioned2022-03-10T21:42:16Z
dc.date.available2022-03-10T21:42:16Z
dc.date.issued2021
dc.description.abstract"The fabrication, microstructure and high-temperature creep behavior of chemically compatible, three-phase alumina/erbium aluminum garnet (Er3Al5O12, EAG)/erbia fully-stabilized cubic ZrO2 (ESZ) particulate composites with the ternary eutectic composition is investigated. The composites were fabricated by a solid-state reaction route of α-Al2O3, Er2O3 and monoclinic ZrO2 powders. The final phases α-Al2O3, EAG and ESZ were obtained after calcination of the powder mixtures at 1400 °C. High dense bulk composites were obtained after sintering at 1500 °C in air for 10 h, with a homogeneous microstructure formed by fine and equiaxed grains of the three phases with average sizes of 1 μm. The composites were tested in compression at temperatures between 1250 and 1450 °C in air at constant load and at constant strain rate. As the temperature increases, a gradual brittle-to-ductile transition was found. Extended steady states of deformation were attained without signs of creep damage in the ductile region, characterized by a stress exponent of nearly 2 and by the lack of dislocation activity and modifications in grain size and shape. The main deformation mechanism in steady state is grain boundary sliding, as found in superplastic metals and ceramics. In the semibrittle region, microcavities developed along grain boundaries; these flaws, however, did not grow and coalescence into macrocracks, resulting in a flaw-tolerant material. Alumina is the creep-controlling phase in the composite because of the grain boundary strengthening caused by the (unavoidable) Er3+- and Zr4+-doping provided by the other two phases. © 2021"es_PE
dc.description.uriTrabajo académicoes_PE
dc.identifier.doi10.1016/j.ceramint.2021.09.286es_PE
dc.identifier.issn02728842
dc.identifier.urihttps://hdl.handle.net/20.500.12590/17052
dc.language.isoenges_PE
dc.publisherElsevier Ltdes_PE
dc.publisher.countryPEes_PE
dc.relationinfo:eu-repo/semantics/articlees_PE
dc.relation.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85116597217&origin=resultslist&sort=plf-f&src=s&st1=Fabrication%2cmicrostructure+and+high-temperature+plastic+deformation+of+three-phase+Al2O3%2fEr3Al5O12%2fZrO2+sintered+ceramics&sid=4d4cbcd9d263ac55de06f2a29deb8998&sot=b&sdt=b&sl=137&s=TITLE-ABS-KEY%28Fabrication%2c+microstructure+and+high-temperature+plastic+deformation+of+three-phase+Al2O3%2fEr3Al5O12%2fZrO2+sintered+ceramics%29&relpos=0&citeCnt=0&searchTerm=&featureToggles=FEATURE_NEW_DOC_DETAILS_EXPORT:1es_PE
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_PE
dc.sourceUniversidad Católica San Pabloes_PE
dc.sourceRepositorio Institucional - UCSPes_PE
dc.subjectAl2O3es_PE
dc.subjectCompositeses_PE
dc.subjectCreepes_PE
dc.subjectGrain boundarieses_PE
dc.titleFabrication, microstructure and high-temperature plastic deformation of three-phase Al2O3/Er3Al5O12/ZrO2 sintered ceramicses_PE
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_PE
renati.typehttps://purl.org/pe-repo/renati/type#trabajoAcademico
thesis.degree.disciplineCiencias Naturaleses_PE
thesis.degree.grantorUniversidad Católica San Pablo. Departamento de Ciencias Naturaleses_PE
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