Compressive strain-dependent bending strength property of Al2O3–ZrO2 (1.5mol% Y2O3) composites performance by HIP

Nanometric powders and sintered ceramics of Al2O3-ZrO2 (1.5 mol% Y2O3) prepared by hot isostatic pressing HIP have been studied. A detailed crystallographic study has been performed through X-ray diffraction, Williamson-Hall method, Rietveld method and high-resolution electron microscopy HREM analys...

Full description

Saved in:
Bibliographic Details
Published in:Materials chemistry and physics 2009-04, Vol.114 (2-3), p.756-762
Main Authors: Reyes-Rojas, A., Esparza-Ponce, H., De la Torre, S.D., Torres-Moye, E.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Nanometric powders and sintered ceramics of Al2O3-ZrO2 (1.5 mol% Y2O3) prepared by hot isostatic pressing HIP have been studied. A detailed crystallographic study has been performed through X-ray diffraction, Williamson-Hall method, Rietveld method and high-resolution electron microscopy HREM analysis. The crystallographic structure data, such as domain size, lattice parameters, wt% phase, and micro-strain direction have been obtained using Rietveld refinement and Williamson-Hall methods. The results revealed that the compressive strain () increased from 0.56 to 1.18 (10-3) as the t-ZrO2 content increased too. The HREM interface study conducted along the [0 0 0 1]Al2O3||[0 0 1]ZrO2 zone axis revealed a micro-strain lattice distortion accumulated at the grain boundary due to the ZrO2 martensitic phase transformation on cooling, t-ZrO2 grains coalescence and to the grain growth of alpha-Al2O3 which cause elongated tetragonal crystals. Micro-strain lattice distortion is adjusted by the shear displacements of the planes (1 1 0) and along and crystallographic directions, respectively; these planes are arrested by the alumina plane. In this case, semi-coherent interfaces were observed along the grain boundary. It is verified that the bending strength increased in connection with the strain accumulation and amount of tetragonal structure.
ISSN:0254-0584
DOI:10.1016/j.matchemphys.2008.10.044