Superplastic deformation of directionally solidified nanofibrillar Al2O3-Y3Al5O12-Zr O2 eutectics
Resumen: Nanofibrillar Al2O3–Y3Al5O12–ZrO2 eutectic rods were manufactured by directional solidification from the melt at high growth rates in an inert atmosphere using the laser-heated floating zone method. Under conditions of cooperative growth, the ternary eutectic presented a homogeneous microstructure, formed by bundles of single-crystal c-oriented Al2O3 and Y3Al5O12 (YAG) whiskers of ˜100 nm in width with smaller Y2O3-doped ZrO2 (YSZ) whiskers between them. Owing to the anisotropic fibrillar microstructure, Al2O3–YAG–YSZ ternary eutectics present high strength and toughness at ambient temperature while they exhibit superplastic behavior at 1600 K and above. Careful examination of the deformed samples by transmission electron microscopy did not show any evidence of dislocation activity and superplastic deformation was attributed to mass-transport by diffusion within the nanometric domains. This combination of high strength and toughness at ambient temperature together with the ability to support large deformations without failure above 1600 K is unique and shows a large potential to develop new structural materials for very high temperature structural applications.
Idioma: Inglés
DOI: 10.1016/j.jeurceramsoc.2013.03.033
Año: 2013
Publicado en: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 33, 13-14 (2013), 2579-2586
ISSN: 0955-2219

Factor impacto JCR: 2.307 (2013)
Categ. JCR: MATERIALS SCIENCE, CERAMICS rank: 2 / 25 = 0.08 (2013) - Q1 - T1
Factor impacto SCIMAGO:

Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2009-13979
Financiación: info:eu-repo/grantAgreement/EUR/NMP4-SL-2008-213669-ENSEMBLE
Tipo y forma: Article (PostPrint)
Área (Departamento): Ciencia de los Materiales e Ingeniería Metalúrgica (Departamento de Ciencia y Tecnología de Materiales y Fluidos)

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Articles > Artículos por área > Ciencia de los Materiales e Ingeniería Metalúrgica



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