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Fracture behaviour of microcrack-free alumina-aluminium titanate ceramics with second phase nanoparticles at alumina grain boundaries

dc.contributor.authorBueno, Salvador
dc.contributor.authorBerger, Marie Hélène
dc.contributor.authorMoreno-Botella, Rodrigo
dc.date.accessioned2024-01-29T08:43:12Z
dc.date.available2024-01-29T08:43:12Z
dc.date.issued2008
dc.description.abstractAlumina + 10 vol.% aluminium titanate composites were obtained by colloidal filtration and reaction sintering of alumina and titania. The materials were dense with aluminium titanate grains of average sizes 2.2–2.4 μm located mainly at alumina triple points. The reaction sintering schedule promoted the formation of additional nanometric grains, identified as aluminium titanate using STEM–EDX analysis between the alumina grains. This special microstructure led to a change of the toughening mechanism from the typical crack bridging reported for microcrack-free composites fabricated from alumina and aluminium titanate powders to microcracking. The identification of microcracking as the main toughening mechanism was done from the analysis of stable fracture tests of SENVB samples in three points bending and fractographic observations. Monophase alumina materials with similar grain sizes were used as reference. Different fracture toughness parameters were derived from the load–displacement curves: the critical stress intensity factor, KIC, the critical energy release rate, GIC, the J-Integral and the work of fracture, γWOF, and the R curves were also built. The comparison between the linear elastic fracture parameters and the non-linear ones revealed significant toughening and flaw tolerance.
dc.identifier.issn0955-2219es_ES
dc.identifier.otherhttps://doi.org/10.1016/j.jeurceramsoc.2008.01.017es_ES
dc.identifier.urihttps://hdl.handle.net/10953/1716
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofJournal of the European Ceramic Societyes_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectAl2O3es_ES
dc.subjectAl2TiO5es_ES
dc.subjectMechanical propertieses_ES
dc.subjectTougheninges_ES
dc.subjectNanocompositeses_ES
dc.titleFracture behaviour of microcrack-free alumina-aluminium titanate ceramics with second phase nanoparticles at alumina grain boundarieses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.type.versioninfo:eu-repo/semantics/draftes_ES

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