Alumina Segregation at Grain Boundaries in Superplastic Y-TZP
| Autor: | Sundararaman, D., Sato, Eiichi, Morioka, H., Kuribayashi, Kazuhiko |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Analytical chemistry Sintering Superplasticity Activation energy Condensed Matter Physics Microstructure Amorphous solid Mechanics of Materials visual_art visual_art.visual_art_medium General Materials Science Grain boundary Ceramic High-resolution transmission electron microscopy |
| Zdroj: | Materials Science Forum. :459-464 |
| ISSN: | 0255-5476 |
| Popis: | 3mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) with various levels of Al 2 O 3 doping and free from SiO 2 contamination were prepared and the supcrplastic behavior and the microstructures were examined. High-purity TZP with less than 0.07wt%Al 2 O 3 had two deformation regions: the low stress region had a stress exponent of three and an apparent activation energy of 630 kJ/mol, and the high stress region had correspondingly two and 460 kJ/mol. On the other hand, TZP containing more than 0.12wt%Al 2 O 3 had only one region which had a stress exponent of two and an activation energy of 480 kJ/mol. High resolution transmission electron microscopy revealed that no amorphous grain boundary phase was produced even with 0.18wt%Al 2 O 3 doping. EDS analyses near grain boundarics revealed that Y segregated at the grain boundaries with denuded zoncs of 30 nm width that may be created during cooling from the sintering temperature. |
| Databáze: | OpenAIRE |
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