Large mechanical properties enhancement in ceramics through vacancy-mediated unit cell disturbance

Zhuo Chen, Yong Huang, Nikola Koutná, Zecui Gao, Davide G. Sangiovanni, Simon Fellner, Georg Haberfehlner, Shengli Jin, Paul H. Mayrhofer, Gerald Kothleitner and Zaoli Zhang ()
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Zhuo Chen: Austrian Academy of Sciences
Yong Huang: Austrian Academy of Sciences
Nikola Koutná: Institute of Materials Science and Technology, TU Wien
Zecui Gao: Institute of Materials Science and Technology, TU Wien
Davide G. Sangiovanni: Linköping University
Simon Fellner: Austrian Academy of Sciences
Georg Haberfehlner: Graz University of Technology
Shengli Jin: Chair of Ceramics, Montanuniversität Leoben
Paul H. Mayrhofer: Institute of Materials Science and Technology, TU Wien
Gerald Kothleitner: Graz University of Technology
Zaoli Zhang: Austrian Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Tailoring vacancies is a feasible way to improve the mechanical properties of ceramics. However, high concentrations of vacancies usually compromise the strength (or hardness). We show that a high elasticity and flexural strength could be achieved simultaneously using a nitride superlattice architecture with disordered anion vacancies up to 50%. Enhanced mechanical properties primarily result from a distinctive deformation mechanism in superlattice ceramics, i.e., unit-cell disturbances. Such a disturbance substantially relieves local high-stress concentration, thus enhancing deformability. No dislocation activity involved also rationalizes its high strength. The work renders a unique understanding of the deformation and strengthening/toughening mechanism in nitride ceramics.

Date: 2023
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DOI: 10.1038/s41467-023-44060-x

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