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Phase transformation induces plasticity with negligible damage in ceria-stabilized zirconia-based ceramics
Université de Lyon, France; ANTHOGYR, France.
Université de Lyon, France.
Université de Lyon, France.
Université de Lyon, France.
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2020 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 183, p. 261-273Article in journal (Refereed) Published
Abstract [en]

Ceramics and their composites are in general brittle materials because they are predominantly made up of ionic and covalent bonds that avoid dislocation motion at room temperature. However, a remarkable ductile behavior has been observed on newly developed 11 mol.% ceria-stabilized zirconia (11Ce-TZP) composite containing fine alumina (8 vol.% Al2O3) and elongated strontium hexa-aluminate (8 vol.% SrAl12O19) grains. The as-synthesized composite also has shown full resistance to Low Temperature Degradation (LTD), relatively high strength and exceptionally high Weibull modulus, allowing its use in a broader range of biomedical applications. In this study, to deepen the understanding of plastic deformation in Ce-TZP based composites that could soon be used for manufacturing dental implants, different mechanical tests were applied on the material, followed by complete microstructural characterization. Distinct from pure Ce-TZP material or other zirconia-based ceramics developed in the past, the material here studied can be permanently strained without affecting the Young modulus, indicating that the ductile response of tested samples cannot be associated to damage occurrence. This ductility is related to the stress-induced tetragonal to monoclinic (t-m) zirconia phase transformation, analogue to Transformation-Induced Plasticity (TRIP) steels, where retained austenite is transformed to martensite. The aim of this study is to corroborate if the observed plasticity can be associated exclusively to the zirconia t-m phase transformation, or also to microcraking induced by the transformation. The t-m transformed-zones produced after bending and biaxial tests were examined by X-ray refraction and SEM/TEM coupled with Raman. The results revealed that the observed elastic-plastic behavior occurs without extensive microcracking, confirming a purely elastic-plastic behavior driven by the phase transformation (absence of damage).

Place, publisher, year, edition, pages
Acta Materialia Inc , 2020. Vol. 183, p. 261-273
Keywords [en]
Ceramic matrix composite, Ceria, Phase transformation, Plasticity, Zirconia, Alumina, Aluminum oxide, Bending tests, Ceramic materials, Ceramic matrix composites, Cerium compounds, Cerium oxide, Elastoplasticity, High strength steel, Linear transformations, Medical applications, Phase transitions, Sodium Aluminate, Strontium compounds, Temperature, Transformation Induced Plasticity steel, Biomedical applications, Dislocation motion, Elastic-plastic behavior, Low-temperature degradations, Micro-structural characterization, Retained austenite, Stabilized zirconia, Zirconia-based ceramics, Polymer matrix composites
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-43410DOI: 10.1016/j.actamat.2019.10.046Scopus ID: 2-s2.0-85075192597OAI: oai:DiVA.org:ri-43410DiVA, id: diva2:1390311
Note

Funding details: 280741; Funding details: 737954, H2020-FTIPilot-2016; Funding text 1: This research was undertaken in the framework of the LONGLIFE project ( http://www.longlife-project.eu ) funded by the European Community's Seventh Framework Program ( FP7/2007-2013 ) [grant agreement n. 280741 ] and the SISCERA project ( http://siscera-project.eu ) also funded by E.U. ( H2020-FTIPilot-2016 ), [grant agreement n. 737954 ].

Available from: 2020-01-31 Created: 2020-01-31 Last updated: 2020-01-31Bibliographically approved

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