Origin of the hardness enhancement in superhard nc-TiN/a-Si<sub>3</sub>N<sub>4</sub>and ultrahard nc-TiN/a-Si<sub>3</sub>N<sub>4</sub>/TiSi<sub>2</sub>nanocomposites
S. VepřekDepartment of Chemistry , Technical University of Munich , Lichtenbergstr. 4, D-85747 Munich, GermanyA. S. ArgonDepartment of Mechanical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA, 02139, USARuifeng ZhangDepartment of Chemistry , Technical University of Munich , Lichtenbergstr. 4, D-85747 Munich, Germany
2007en
ABI
Аннотация
The ideal shear strengths of a variety of TiN/SiN x /TiN interfaces have been calculated with the ab initio density functional theory. Using these data, the high hardness H ≥ 105 GPa, which has been reported for the quasi-ternary nc-TiN/a-Si3N4/TiSi2 nanocomposites, can be explained on the basis of the Sachs average of polycrystal plasticity of randomly oriented equiaxed grains and pressure-enhanced flow stress.
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