000151450 001__ 151450
000151450 005__ 20250313085414.0
000151450 0247_ $$2doi$$a10.1111/jace.20443
000151450 0248_ $$2sideral$$a143169
000151450 037__ $$aART-2025-143169
000151450 041__ $$aeng
000151450 100__ $$0(orcid)0000-0003-3480-398X$$aOliete, Patricia B.$$uUniversidad de Zaragoza
000151450 245__ $$aPhase segregation of aged MgCSZ–MgO directionally solidified eutectic composites
000151450 260__ $$c2025
000151450 5203_ $$aThe 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.
000151450 536__ $$9info:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-S$$9info:eu-repo/grantAgreement/ES/DGA/T02-23R$$9info:eu-repo/grantAgreement/ES/MCINN/FEDER/PID2021-124863OB-I00
000151450 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000151450 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000151450 700__ $$0(orcid)0000-0003-0747-405X$$aMerino, Rosa I.
000151450 700__ $$0(orcid)0000-0003-2242-6822$$aPeña, Jose I.$$uUniversidad de Zaragoza
000151450 700__ $$0(orcid)0000-0002-5793-2058$$aSanjuán, María Luisa
000151450 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal.
000151450 773__ $$g(2025), e20443 [16 pp.]$$pJ. Am. Ceram. Soc.$$tJOURNAL OF THE AMERICAN CERAMIC SOCIETY$$x0002-7820
000151450 8564_ $$s3658956$$uhttps://zaguan.unizar.es/record/151450/files/texto_completo.pdf$$yVersión publicada
000151450 8564_ $$s2351938$$uhttps://zaguan.unizar.es/record/151450/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000151450 909CO $$ooai:zaguan.unizar.es:151450$$particulos$$pdriver
000151450 951__ $$a2025-03-13-08:43:50
000151450 980__ $$aARTICLE