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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1856| Compressive strain-dependent bending strength property of Al2O3–ZrO2 (1.5 mol% Y2O3) composites performance by HIP | |
| HILDA ESPERANZA ESPARZA PONCE ARMANDO REYES ROJAS | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| TEM | |
| 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. | |
| 2009 | |
| Artículo | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
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| Compressive strain-dependent bending strenght property of Al2O3-ZrO2 PDF 2009.pdf | 899.87 kB | Adobe PDF | Visualizar/Abrir |