Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites

The improvement of the thermomechanical properties of Mg-partially stabilized zirconia after appropriate thermal treatments is well known. Most studies in this subject have been conducted in polycrystalline materials produced by solid-state reaction. In this work, we analyze the segregation behavior...

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Authors: Oliete, Patricia B., Merino, R. I., Peña, J. I., Sanjuán, M. L.
Format: article
Status:Published version
Publication Date:2025
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/390170
Online Access:http://hdl.handle.net/10261/390170
Access Level:Open access
Keyword:Ageing
Mechanical properties
Eutectics
MgO
Mg2Zr5O12
ZrO2
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spelling Phase segregation of aged MgCSZ–MgO directionally solidified eutectic compositesOliete, Patricia B.Merino, R. I.Peña, J. I.Sanjuán, M. L.AgeingMechanical propertiesEutecticsMgOMg2Zr5O12ZrO2The improvement of the thermomechanical properties of Mg-partially stabilized zirconia after appropriate thermal treatments is well known. Most studies in this subject have been conducted in polycrystalline materials produced by solid-state reaction. In this work, we analyze the segregation behavior and mechanical properties of solidified eutectic composites of the ZrO2–MgO system, where MgO lamellae or fibers are embedded into a cubic Mg-stabilized zirconia (MgCSZ) containing ∼18 mol% MgO. The eutectics have been aged at 1240 or 1225°C for periods varying between 2 and 24 h. This treatment results in the progressive phase separation of the MgCSZ matrix into different mixtures of tetragonal (t), monoclinic (m), δ (Mg2Zr5O12), and MgO phases. Two types of segregation are observed, according to whether the Mg-rich phase is the metastable δ phase (type I) or MgO (type II). Both types may coexist in the same sample but type I predominates at 1240°C and type II at 1225°C. Type I is mainly of the t + δ type, although for long ageing time the t precipitates transform to monoclinic symmetry, resulting in a final m + δ segregation scheme. In type II segregation, the monoclinic phase is the main Mg-poor product. Hardness and toughness have been studied by the Vickers indentation method. The indentation fracture toughness KIC increases progressively with ageing time and for 24 h treatment is more than doubled with respect to the as-processed eutectic, while the hardness decreases slightly.The authors acknowledge financial support through grant PID2021-124863OB-I00 funded by MCIN/AEI/10.13039/501100011033; CEX2023-001286-S funded by MICIU/AEI/10.13039/ 501100011033 and DGA funds to T02_23R research group.With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2023-001286-S).Peer reviewedWiley-VCHAgencia Estatal de Investigación (España)Ministerio de Ciencia, Innovación y Universidades (España)Diputación General de AragónConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/390170reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-124863OB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2023-001286-SThe underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1111/jace.20443https://doi.org/10.1111/jace.20443Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3901702026-05-22T06:33:51Z
dc.title.none.fl_str_mv Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
title Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
spellingShingle Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
Oliete, Patricia B.
Ageing
Mechanical properties
Eutectics
MgO
Mg2Zr5O12
ZrO2
title_short Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
title_full Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
title_fullStr Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
title_full_unstemmed Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
title_sort Phase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
dc.creator.none.fl_str_mv Oliete, Patricia B.
Merino, R. I.
Peña, J. I.
Sanjuán, M. L.
author Oliete, Patricia B.
author_facet Oliete, Patricia B.
Merino, R. I.
Peña, J. I.
Sanjuán, M. L.
author_role author
author2 Merino, R. I.
Peña, J. I.
Sanjuán, M. L.
author2_role author
author
author
dc.contributor.none.fl_str_mv Agencia Estatal de Investigación (España)
Ministerio de Ciencia, Innovación y Universidades (España)
Diputación General de Aragón
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Ageing
Mechanical properties
Eutectics
MgO
Mg2Zr5O12
ZrO2
topic Ageing
Mechanical properties
Eutectics
MgO
Mg2Zr5O12
ZrO2
description The improvement of the thermomechanical properties of Mg-partially stabilized zirconia after appropriate thermal treatments is well known. Most studies in this subject have been conducted in polycrystalline materials produced by solid-state reaction. In this work, we analyze the segregation behavior and mechanical properties of solidified eutectic composites of the ZrO2–MgO system, where MgO lamellae or fibers are embedded into a cubic Mg-stabilized zirconia (MgCSZ) containing ∼18 mol% MgO. The eutectics have been aged at 1240 or 1225°C for periods varying between 2 and 24 h. This treatment results in the progressive phase separation of the MgCSZ matrix into different mixtures of tetragonal (t), monoclinic (m), δ (Mg2Zr5O12), and MgO phases. Two types of segregation are observed, according to whether the Mg-rich phase is the metastable δ phase (type I) or MgO (type II). Both types may coexist in the same sample but type I predominates at 1240°C and type II at 1225°C. Type I is mainly of the t + δ type, although for long ageing time the t precipitates transform to monoclinic symmetry, resulting in a final m + δ segregation scheme. In type II segregation, the monoclinic phase is the main Mg-poor product. Hardness and toughness have been studied by the Vickers indentation method. The indentation fracture toughness KIC increases progressively with ageing time and for 24 h treatment is more than doubled with respect to the as-processed eutectic, while the hardness decreases slightly.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/390170
url http://hdl.handle.net/10261/390170
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-124863OB-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2023-001286-S
The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1111/jace.20443
https://doi.org/10.1111/jace.20443
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Wiley-VCH
publisher.none.fl_str_mv Wiley-VCH
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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