Fracture Toughness and Strength of Al2O3-Y3Al5O12 and Al2O3-Y3Al5O12-ZrO2 Directionally-Solidified Eutetic Oxides up to 1900K

Pastor Caño, Jose Ignacio and Llorca Martinez, Francisco Javier and Martin Sanz, Antonia and Peña Torre, José Ignacio and Oliete Terraz, Patricia Beatriz (2008). Fracture Toughness and Strength of Al2O3-Y3Al5O12 and Al2O3-Y3Al5O12-ZrO2 Directionally-Solidified Eutetic Oxides up to 1900K. "Journal of The European Ceramic Society", v. 28 (n. 12); pp. 2345-2351. ISSN 0955-2219. https://doi.org/10.1016/j.jeurceramsoc.2008.01.006.

Description

Title: Fracture Toughness and Strength of Al2O3-Y3Al5O12 and Al2O3-Y3Al5O12-ZrO2 Directionally-Solidified Eutetic Oxides up to 1900K
Author/s:
  • Pastor Caño, Jose Ignacio
  • Llorca Martinez, Francisco Javier
  • Martin Sanz, Antonia
  • Peña Torre, José Ignacio
  • Oliete Terraz, Patricia Beatriz
Item Type: Article
Título de Revista/Publicación: Journal of The European Ceramic Society
Date: August 2008
ISSN: 0955-2219
Volume: 28
Subjects:
Freetext Keywords: Microstructure-final; Strength; Fracture; ZrO2–Al2O3–Y2O3; Directionally solidified eutectic oxides
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (347kB) | Preview

Abstract

Ceramics rods of binary (Al2O3–Y3Al5O12) and ternary (Al2O3–Y3Al5O12–ZrO2) eutectic ceramic oxides were grown in air and nitrogen using the laser-heated floating zone method. Both materials presented a fine and homogeneous microstructure, free from defects, with an average interlamellar spacing of 1.1 and 0.7 _mfor the binary and ternary eutectics, respectively. The strength and the toughness of the rods were measured from ambient temperature up to 1900K by three-point bending. For the fracture tests, a sharp notch was introduced in the rods using a femto second-pulsed laser. Samples grown in nitrogen presented higher strength than those grown in air. The mechanical properties of the Al2O3–YAG binary eutectic did not change with a temperature up to 1500–1600K and plastic deformation above this temperature led to a slight reduction in strength and an increase in toughness. In the case of the ternary eutectic, the toughening effect of the thermal residual stresses disappeared at high temperature and the toughness decreased by a factor of two at 1473 K. The behavior of the ternary eutectic above this temperature followed the trends of the binary one although the changes in strength and toughness were much larger because of the smaller domain size (which favored diffusion-assisted plastic flow) and the lower eutectic temperature.

  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM