Origin of the hardness enhancement in superhard nc-TiN/a-Si3N4 and ultrahard nc-TiN/a-Si3N4/TiSi2 nanocomposites |
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| Authors: | S Veprek A S Argon R F Zhang |
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| Institution: | 1. Department of Chemistry , Technical University of Munich , Lichtenbergstr. 4, D-85747 Munich, Germany stan.veprek@lrz.tu-muenchen.de;3. Department of Mechanical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA, 02139, USA;4. Department of Chemistry , Technical University of Munich , Lichtenbergstr. 4, D-85747 Munich, Germany |
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| Abstract: | 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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