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  • Chen, Zhuo, et al. (author)
  • Large mechanical properties enhancement in ceramics through vacancy-mediated unit cell disturbance
  • 2023
  • In: Nature Communications. - : Nature Publishing Group. - 2041-1723. ; 14:1
  • Journal article (peer-reviewed)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.
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