000151151 001__ 151151 000151151 005__ 20251017144608.0 000151151 0247_ $$2doi$$a10.1016/j.actamat.2021.117139 000151151 0248_ $$2sideral$$a125839 000151151 037__ $$aART-2021-125839 000151151 041__ $$aeng 000151151 100__ $$0(orcid)0000-0001-6337-5510$$aMoshtaghioun B. M. 000151151 245__ $$aCan Y2O3-MgO eutectics be new promising structural and optical ceramics? 000151151 260__ $$c2021 000151151 5060_ $$aAccess copy available to the general public$$fUnrestricted 000151151 5203_ $$aThe manuscript addresses the solidification of Y2O3-MgO eutectic composites for the first time, and the study of their microstructure, mechanical properties and infrared transmittance. The composites with eutectic composition (20 % vol MgO) have been solidified using the laser floating zone method, at solidification rates between 25 mm/h and 750 mm/h. Their microstructure has been quantified and the conditions for coupled or cellular regime determined. They are dense, with elastic modulus, as determined from nanoindentation tests of around 200 GPa. The highest 3-point flexural strength (256±25 MPa) values and highest infrared optical transmittance has been observed for the material solidified with the finest, still homogeneous microstructure that could be achieved. This microstructure, which is achieved at a solidification rate of 50mm/h, consists of MgO fibers of 600 nm diameter embedded in the Y2O3 matrix. The thin MgO rods and the associated residual stress field contribute to the material strength as they deviate the propagating crack. The Vickers Hardness ranged from 9.5 to 11.5 GPa, with mild increase with the decrease of the microstructural size which has been rationalized as the MgO rods blocking the movement of dislocations in the matrix, as in other studied composites. Indentation fracture toughness values around 3 MPa.m1/2, independent of the sample microstructure, have been measured. In the longitudinal direction transmittance values higher than 80 % in the wavelength range from 3.5 to 7 µm, for 1 mm thick slices have been measured. Light scattering limits the short wavelength cut-off to around 2 µm for light travelling in the longitudinal direction, while a transmittance gap is observed in the transverse direction, of photonic crystal like nature. 000151151 536__ $$9info:eu-repo/grantAgreement/ES/DGA/T02-20R$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2016-77769R$$9info:eu-repo/grantAgreement/ES/MINECO/PID2019-103847RJ-I00 000151151 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es 000151151 590__ $$a9.209$$b2021 000151151 591__ $$aMETALLURGY & METALLURGICAL ENGINEERING$$b3 / 79 = 0.038$$c2021$$dQ1$$eT1 000151151 591__ $$aMATERIALS SCIENCE, MULTIDISCIPLINARY$$b60 / 344 = 0.174$$c2021$$dQ1$$eT1 000151151 592__ $$a2.828$$b2021 000151151 593__ $$aCeramics and Composites$$c2021$$dQ1 000151151 593__ $$aPolymers and Plastics$$c2021$$dQ1 000151151 593__ $$aElectronic, Optical and Magnetic Materials$$c2021$$dQ1 000151151 594__ $$a14.2$$b2021 000151151 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000151151 700__ $$0(orcid)0000-0003-2242-6822$$aPeña J. I.$$uUniversidad de Zaragoza 000151151 700__ $$0(orcid)0000-0003-0747-405X$$aMerino R. I. 000151151 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal. 000151151 773__ $$g216 (2021), 117139 [12 pp.]$$pActa mater.$$tActa Materialia$$x1359-6454 000151151 8564_ $$s4042270$$uhttps://zaguan.unizar.es/record/151151/files/texto_completo.pdf$$yVersión publicada 000151151 8564_ $$s2758260$$uhttps://zaguan.unizar.es/record/151151/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000151151 909CO $$ooai:zaguan.unizar.es:151151$$particulos$$pdriver 000151151 951__ $$a2025-10-17-14:16:05 000151151 980__ $$aARTICLE