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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 ISSN 2041-1723.

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Official URL: http://dx.doi.org/10.1038/s41467-017-00139-w

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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 and Medicine > Engineering > 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:
DateEvent
24 July 2017Published
26 May 2017Accepted
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 (Creative Commons)
Date of first compliant deposit: 24 July 2017
Date of first compliant Open Access: 25 July 2017
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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