MATERIALS SCIENCE AND TECHNOLOGY OF MATERIALS

Mechanical properties of nanoscale coatings on the base of Ti, Tin и ZrN

V. G. Zavodinskу^a, Yu. G. Kabaldin<sup>b

a</sup> Institute for Materials Science of the Russian Academy of Sciences
^b Nizhny Novgorod State Technical University

Abstract: Mechanical properties of TiN/ZrN and TiN/Ti/ZrN coatings used for protection of cutting tools and other details and construction from wear and corrosion are studied in the framework of the density functional theory and the theory of pseudopotentials.
Calculations have shown that the Young’s module of the TiN/Ti/ZrN coatings is approximately twice larger than the Young’s module of the TiN/ZrN coatings, while the shear module a little less. That fact can lead at the same time to increasing of their hardnessand to decreasing of fragility.
Simulation of surface stretching of the TiN/ZrN and TiN/Ti/ZrN coatings had shown that the surface of the TiN/Ti/ZrN system is much stronger than that of TiN/ZrN. Its break comes at twice bigger lengthening and at twice bigger applied force. Therefore, TiN/Ti/ZrN coatings are much more crac k- stable than TiN/ZrN coatings.

Keywords: Young's module, shear module, modeling, surface stretching, cracks.

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