Crystallographic texture in Al2O3-ZrO2 (Y2Ο3) directionally solidified eutectics

• Published in: Journal of the European Ceramic Society 2008-10, Vol.28 (14), p.2681-2686
• Main Authors: RAMIREZ-RICO, J, DE ARELLANO-LOPEZ, A. R, MARTINEZ-FERNANDEZ, J, PENA, J. I, LARREA, A
• Format: Article
• Language: English
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Cermets, ceramic and refractory composites; Chemical industry and chemicals; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Other materials; Physics; Specific materials; Structural ceramics; Technical ceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2008.04.015

Directionally solidified Al2O3-based eutectics are in-situ composites grown from the melt. The directional nature of the solidification process makes these materials highly anisotropic and therefore the measurement and quantification of their crystallographic texture is necessary to understand their physical properties. The texture of Al2O3-ZrO2 (12 mol% Y2O3) eutectic rods was studied by X-ray and electron backscattering diffraction. The phases grew according to the relationship {10bar12}Al2O3//{110}ZrO2 and Al2O3 was oriented with its c-axis approximately parallel to the growth direction. The c-axis orientation was not constant throughout the sample, but changed according to the distance from the growth axis. The c-axis orientation spread was 10 degrees. This spread was a consequence of the curvature of the liquid-solid interface during solidification, whose shape was reconstructed using EBSD data. 24 refs.