Thermal stability of the structure and properties of gradient and gradient-layered coatings of the Ti-Al-Si-Cu-N system | Izvestiya vuzov. Fizika. 2019. № 9. DOI: 10.17223/00213411/62/9/63

Thermal stability of the structure and properties of gradient and gradient-layered coatings of the Ti-Al-Si-Cu-N system

A study of the changes in the elemental composition, structure and mechanical properties of the Ti-Al-Si-Cu-N system during annealing in vacuum in the temperature range up to 1373 K was made using techniques of dark-field electron microscopic analysis, X-ray energy dispersive analysis, hardness measurement and scratch tests. It has been established that at annealing temperatures up to 1173 K structural changes (alignment of the lattice parameter of the nitride phase over the coating thickness, decrease in the bending-torsion of the crystal lattice) are due to diffusion redistribution with a decrease in the concentrations of nitride alloying elements and precipitation of nanosized copper crystals. The decrease in the bending-torsion of the crystal lattice nitride phase at several times in comparison with the state after deposition, changes in the concentrations of the coating elements in tens of at. %, the formation of a heterophase nanocrystalline structure were found for an annealing temperature of 1373 K at their localization on the interfaces. The similarity of the defective microstructure inside the coatings crystals after annealing 1373 K was established. The possible influence of the identified structural-phase transformations on the change in the values of hardness and adhesive strength of the coatings is discussed.

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Keywords

градиентные, градиентно-слоистые покрытия, отжиги в вакууме, электронная микроскопия, изгиб решётки, фазовые превращения, твёрдость, скрэтч, gradient and gradient-layered coatings, annealing in vacuum, electron microscopy, bending-torsion of the crystal lattice, phase transformations, hardness, scratch

Authors

Name	Organization	E-mail
Ovchinnikov S.V.	Institute of Strength Physics and Materials Science of SB RAS	ovm@spti.tsu.ru
Pinzhin Y.P.	Institute of Strength Physics and Materials Science of SB RAS	pinzhin@phys.tsu.ru

Всего: 2

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