Large mechanical properties enhancement in ceramics through vacancy-mediated unit cell disturbance
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
Autoren
Organisationseinheiten
Externe Organisationseinheiten
- Erich-Schmid-Institut für Materialwissenschaft der Österreichischen Akademie der Wissenschaften
- Technische Universität Wien
- Linköping University
- Technische Universität Graz
- Zentrum für 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
Originalsprache | Englisch |
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Aufsatznummer | 8387 |
Seitenumfang | 11 |
Fachzeitschrift | Nature Communications |
Jahrgang | 14.2023 |
Ausgabenummer | 1 |
DOIs | |
Status | Veröffentlicht - 16 Dez. 2023 |