Título
Compressive strain-dependent bending strength property of Al2O3–ZrO2 (1.5 mol% Y2O3) composites performance by HIP
Autor
HILDA ESPERANZA ESPARZA PONCE
ARMANDO REYES ROJAS
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
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 throughX-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 microstrain direction have been obtained using Rietveld refinement and Williamson–Hall methods. The results revealed that the compressive strain (ε) increased from0.56 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 α-Al2O3which cause elongated tetragonal crystals. Micro-strain lattice distortion is adjusted by the shear displacements of the planes (1 1 0) and (1 1
0) along [1
1 0] and [1
1 0] crystallographic directions, respectively; these planes are arrested by the (1 0 1
0) alumina plane. In this case, semi-coherent interfaceswere observed along the grain boundary. It is verified that the bending strength increased in connection with the strain accumulation and amount of tetragonal structure.
Fecha de publicación
2009
Tipo de publicación
Artículo
Versión de la publicación
Versión enviada
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Formato
application/pdf
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Inglés
Repositorio Orígen
Fuente de Objetos Científicos Open Access
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