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

Author

Listed:
  • Zhuo Chen

    (Austrian Academy of Sciences)

  • Yong Huang

    (Austrian Academy of Sciences)

  • Nikola Koutná

    (Institute of Materials Science and Technology, TU Wien
    Linköping University)

  • 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
    Graz Centre for Electron Microscopy)

  • Zaoli Zhang

    (Austrian Academy of Sciences
    Montanuniversität Leoben)

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.

Suggested Citation

  • Zhuo Chen & Yong Huang & Nikola Koutná & Zecui Gao & Davide G. Sangiovanni & Simon Fellner & Georg Haberfehlner & Shengli Jin & Paul H. Mayrhofer & Gerald Kothleitner & Zaoli Zhang, 2023. "Large mechanical properties enhancement in ceramics through vacancy-mediated unit cell disturbance," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-44060-x
    DOI: 10.1038/s41467-023-44060-x
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    References listed on IDEAS

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    1. Lei Li & Guoxujia Chen & He Zheng & Weiwei Meng & Shuangfeng Jia & Ligong Zhao & Peili Zhao & Ying Zhang & Shuangshuang Huang & Tianlong Huang & Jianbo Wang, 2021. "Room-temperature oxygen vacancy migration induced reversible phase transformation during the anelastic deformation in CuO," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    2. Ying Liu & Xiangyuan Cui & Ranming Niu & Shujun Zhang & Xiaozhou Liao & Scott D. Moss & Peter Finkel & Magnus Garbrecht & Simon P. Ringer & Julie M. Cairney, 2022. "Giant room temperature compression and bending in ferroelectric oxide pillars," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
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