科研之友
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摘要
In the present study, the elastic properties of Ti1-xAlxN (0 <= x <= 0.75) hard coatings were studied by ab initio calculations. The bulk (B), shear (G) and Young's (E) moduli and Poisson's ratio (upsilon) were calculated for isotropic materials. In addition, the anisotropy of the elastic moduli (G(12), G(23), E-11, E-22) and the Poisson's ratios (nu(12), nu(21), nu(23)) are described with respect to particular crystallographic planes. The results of the calculations enable us to relate the experimentally observed increase in hardness to an increasing Al content, at least within the range 0 <= x <= 0.5, to an increase in G and E and to a decrease in B. The calculated longitudinal Young's modulus E-11(1 1 1) of Ti1-xAlxN (0 <= x <= 0.4) is in good agreement with experimental data taken from the coatings with the (1 0 0) preferred orientation.
- 出版日期2007-7-7
