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In situ stable crack growth at the micron scale
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Sernicola, Giorgio, Giovannini, Tommaso, Patel, Punitbhai, Kermode, James R., Balint, Daniel S., Britton, T. Ben and Giuliani, Finn (2017) In situ stable crack growth at the micron scale. Nature Communications, 8 (1). 108. doi:10.1038/s41467-017-00139-w
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Official URL: http://dx.doi.org/10.1038/s41467-017-00139-w
Abstract
Grain boundaries typically dominate fracture toughness, strength and slow crack growth in ceramics. To improve these properties through mechanistically informed grain boundary engineering, precise measurement of the mechanical properties of individual boundaries is essential, although it is rarely achieved due to the complexity of the task. Here we present an approach to characterize fracture energy at the lengthscale of individual grain boundaries and demonstrate this capability with measurement of the surface energy of silicon carbide 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 correlate well with our density functional theory calculations of the surface energy of the same silicon carbide plane. Subsequently, we measure the fracture energy for a bi-crystal of silicon carbide, diffusion bonded with a thin glassy layer.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TP Chemical technology | ||||||
| Divisions: | Faculty of Science > Engineering | ||||||
| Library of Congress Subject Headings (LCSH): | Ceramics -- Industrial applications , Grain boundaries | ||||||
| Journal or Publication Title: | Nature Communications | ||||||
| Publisher: | Nature Publishing Group | ||||||
| ISSN: | 2041-1723 | ||||||
| Official Date: | 24 July 2017 | ||||||
| Dates: |
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| Date of first compliant deposit: | 24 July 2017 | ||||||
| Volume: | 8 | ||||||
| Number: | 1 | ||||||
| Article Number: | 108 | ||||||
| DOI: | 10.1038/s41467-017-00139-w | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access | ||||||
| Funder: | Element Six, Royal Academy of Engineering, Engineering and Physical Sciences Research Council (EPSRC), United States. Department of Energy. Office of Science | ||||||
| Grant number: | EP/F033605/1, EP/L027682/1, EP/K028707/ 1, EP/P002188/1 (EPSRC), Contract DE-AC02-06CH11357 (United States. Department of Energy. Office of Science) |
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