Mechanical properties of nonstoichiometric cubic titanium carbide TiCy
Literature Information
The changes of elastic constants cij in the homogeneity interval from TiC0.50 to TiC1.00 of nonstoichiometric disordered cubic titanium carbide are evaluated by a semiempirical method for the first time. It is established that the elastic stiffness constants cij of a disordered TiCy decrease as the titanium carbide composition deviates from stoichiometry. The distributions of the Young's modulus E, the Poisson's ratio μ, shear G and bulk B moduli of monocrystalline particles of cubic TiCy on the crystallographic direction [hkl] and on relative carbon content y are calculated. The lowest values of Ghkl for TiCy are observed in the (111) plane. It is found that the deviation of titanium carbide from stoichiometric composition TiC1.0 is accompanied by increase of the elastic anisotropy. It is shown that the calculated Vickers hardness HV of titanium carbide on the relative carbon content y increases non-linearly with growing y.
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