Large mechanical properties enhancement in ceramics through vacancy-mediated unit cell disturbance
Research output: Contribution to journal › Article › Research › peer-review
Authors
Organisational units
External Organisational units
- Erich Schmid Institute of Materials Science
- Institute of Materials Science and Technology
- Linköping University
- Technische Universität Graz
- Zentrum f Elektronenmikroskopie Graz
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.
Details
Original language | English |
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Article number | 8387 |
Number of pages | 11 |
Journal | Nature Communications |
Volume | 14.2023 |
Issue number | 1 |
DOIs | |
Publication status | Published - 16 Dec 2023 |