Strategies for simultaneous strengthening and toughening via nanoscopic intracrystalline defects in a biogenic ceramic.

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Tytuł:: Strategies for simultaneous strengthening and toughening via nanoscopic intracrystalline defects in a biogenic ceramic.
Autorzy:: Deng Z; Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA.
Chen H; Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA.
Yang T; Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA.
Jia Z; Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA.
Weaver JC; John A. Paulson School of Engineering and Applied Sciences, Harvard University, 60 Oxford Street, Cambridge, MA, 02138, USA.
Shevchenko PD; Advanced Photon Source, Argonne National Laboratory, 9700S Cass Ave, Lemont, IL, 60439, USA.
De Carlo F; Advanced Photon Source, Argonne National Laboratory, 9700S Cass Ave, Lemont, IL, 60439, USA.
Mirzaeifar R; Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA.
Li L; Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA. .
Źródło:: Nature communications [Nat Commun] 2020 Nov 10; Vol. 11 (1), pp. 5678. Date of Electronic Publication: 2020 Nov 10.
Typ publikacji:: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
Język:: English
Imprint Name(s):: Original Publication: [London] : Nature Pub. Group
MeSH Terms:: Biomineralization*
Bivalvia/*metabolism
Calcium Carbonate/*metabolism
Ceramics/*chemistry
Animals ; Computer Simulation ; Models, Biological
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Substance Nomenclature:: H0G9379FGK (Calcium Carbonate)
Entry Date(s):: Date Created: 20201111 Date Completed: 20201125 Latest Revision: 20231112
Update Code:: 20240105
PubMed Central ID:: PMC7655841
DOI:: 10.1038/s41467-020-19416-2
PMID:: 33173053
: Czasopismo naukowe

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While many organisms synthesize robust skeletal composites consisting of spatially discrete organic and mineral (ceramic) phases, the intrinsic mechanical properties of the mineral phases are poorly understood. Using the shell of the marine bivalve Atrina rigida as a model system, and through a combination of multiscale structural and mechanical characterization in conjunction with theoretical and computational modeling, we uncover the underlying mechanical roles of a ubiquitous structural motif in biogenic calcite, their nanoscopic intracrystalline defects. These nanoscopic defects not only suppress the soft yielding of pure calcite through the classical precipitation strengthening mechanism, but also enhance energy dissipation through controlled nano- and micro-fracture, where the defects' size, geometry, orientation, and distribution facilitate and guide crack initialization and propagation. These nano- and micro-scale cracks are further confined by larger scale intercrystalline organic interfaces, enabling further improved damage tolerance.

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