Superplastic deformation of directionally solidified nanofibrillar Al2O3-Y3Al5O12-ZrO2 eutectics

Pastor Caño, Jose Ignacio ORCID: https://orcid.org/0000-0003-3561-5999, Martin Sanz, Antonia ORCID: https://orcid.org/0000-0003-1291-948X, Molina Aldareguía, Jon M. ORCID: https://orcid.org/0000-0003-3508-6003, Llorca Martinez, Francisco Javier ORCID: https://orcid.org/0000-0002-3122-7879, Oliete Terraz, Patricia Beatriz, Larrea, Angel, Peña Torre, José Ignacio, Orera, V.M. and Arenal, Raúl (2013). Superplastic deformation of directionally solidified nanofibrillar Al2O3-Y3Al5O12-ZrO2 eutectics. "Journal of the European Ceramic Society", v. 33 (n. 13-14); pp. 2579-2586. ISSN 0955-2219. https://doi.org/10.1016/j.jeurceramsoc.2013.03.033.

Description

Title: Superplastic deformation of directionally solidified nanofibrillar Al2O3-Y3Al5O12-ZrO2 eutectics
Author/s:
Item Type: Article
Título de Revista/Publicación: Journal of the European Ceramic Society
Date: November 2013
ISSN: 0955-2219
Volume: 33
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 26558
DC Identifier: https://oa.upm.es/26558/
OAI Identifier: oai:oa.upm.es:26558
DOI: 10.1016/j.jeurceramsoc.2013.03.033
Official URL: http://www.sciencedirect.com/science/article/pii/S...
Deposited by: Memoria Investigacion
Deposited on: 26 May 2014 11:36
Last Modified: 01 Dec 2015 23:56
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