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

Chen, ZhuoErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria (författare)

Funding: Austrian Science Fund (Fonds zur Frderung der Wissenschaftlichen Forschung) [FWF P 33696]; China Scholarship Council (CSC) [201908440933]; Competence Center Functional Nanoscale Materials (FunMat-II) (Vinnova) [2022-03071]; Swedish Research Council (VR) [Ndegrees VR-2021-04426]; Swedish Research Council [Ndegrees VR-2015-04630]
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.

Huang, YongErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria (författare)
Koutná, Nikola,1991-Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten,Institute of Materials Science and Technology, TU Wien, A-1060, Vienna, Austria(Swepub:liu)nikko93 (författare)
Gao, ZecuiInstitute of Materials Science and Technology, TU Wien, Vienna, Austria (författare)
Sangiovanni, Davide Giuseppe,1979-Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten(Swepub:liu)davsa82 (författare)
Fellner, SimonInstitute of Materials Science and Technology, TU Wien, Vienna, Austria (författare)
Haberfehlner, GeorgInstitute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Graz, Austria (författare)
Jin, ShengliChair of Ceramics, Montanuniversität Leoben, Leoben, Austria (författare)
Mayrhofer, Paul H.Institute of Materials Science and Technology, TU Wien, Vienna, Austria (författare)
Kothleitner, GeraldInstitute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Graz, Austria; Graz Centre for Electron Microscopy, Graz, Austria (författare)
Zhang, ZaoliErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria; Department of Materials Science, Montanuniversität Leoben, Leoben, Austria (författare)
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, AustriaTeoretisk Fysik (creator_code:org_t)

Av författaren/redakt...: Chen, Zhuo; Huang, Yong; Koutná, Nikola, ...; Gao, Zecui; Sangiovanni, Dav ...; Fellner, Simon; visa fler...; Haberfehlner, Ge ...; Jin, Shengli; Mayrhofer, Paul ...; Kothleitner, Ger ...; Zhang, Zaoli; visa färre...

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