Anisotropy of fracture toughness in nanostructured ceramics controlled by grain boundary design

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F19%3APU143518" target="_blank" >RIV/00216305:26620/19:PU143518 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.matdes.2018.11.028" target="_blank" >https://doi.org/10.1016/j.matdes.2018.11.028</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matdes.2018.11.028" target="_blank" >10.1016/j.matdes.2018.11.028</a>

Result language

angličtina

Original language name

Anisotropy of fracture toughness in nanostructured ceramics controlled by grain boundary design

Original language description

The fracture toughness of nanostructured materials depends on anisotropic physical properties of individual microstructural features, their texture and/or topology. In this work, intentionally sculptured grain boundaries of low cohesive energy were used to form "weak" and "tough" crack propagation directions within a nanocrystal-line TiN film, allowing to correlate the directional arrangement of grains and anisotropy of fracture toughness. By using a selective micromechanical testing approach, two different cracking directions were probed in a scanning electron microscope by loading microcantilever beam specimens prepared parallel and perpendicular to the stacked direction of the alternately tilted columnar grains. The fracture toughness along the sculptured grain boundaries was similar to 30% higher due to effective multiple crack deflection at the kink planes, which was not observed along weak cleavage planes in the stacked direction. The results indicate the fundamental importance of microstructural design in the synthesis of tough nanostructured ceramics, whose anisotropic mechanical properties can be controlled effectively by incorporating dedicated microstructural features of well-defined topology, orientation and density. (C) 2018 The Authors. Published by Elsevier Ltd.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20504 - Ceramics

Project

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Continuities

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Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Materials & Design

ISSN

0264-1275

e-ISSN

1873-4197

Volume of the periodical

161

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

6

Pages from-to

80-85

UT code for WoS article

000453745400009

EID of the result in the Scopus database

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