| Autor: |
Sernicola, G, Giovannini, T, Patel, P, Kermode, J, Balint, D, Britton, TB, Giuliani, F |
| Přispěvatelé: |
Engineering and Physical Sciences Research Council |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
Nature Communications, Vol 8, Iss 1, Pp 1-9 (2017) |
| ISSN: |
2041-1723 |
| Popis: |
Grain boundaries typically dominate fracture toughness, strength, slow crack growth of ceramics. To improve these properties through mechanistically informed grain boundary engineering, precise measurement of the mechanical properties of individua l boundaries is essential, although this is rarely achieved due to its complexity. Here we present a new approach to characterise the fracture energy at the lengthscale of individual grain boundaries and demonstrate this capability with measurement of the surface energy of silicon carbide (SiC) single crystals. We perform experiments using an in situ scanning electron microscopy based double cantilever beam test, thus enabling viewing and measurement of stable crack growth directly. These experiments correl ate well with our density functional theory (DFT) calculations of the surface energy of the same SiC plane. Subsequently, we measure the fracture energy for a bi - crystal of SiC, diffusion bonded with a thin glassy layer. These measurements ultimately promo te microstructural engineering of novel and advanced ceramics. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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