No abstract

No abstract

a b s t r a c tNitrides of high-entropy alloys (TiHfZrNbVTa)N were fabricated using cathodic-vacuum-arc-vapordeposition method. Morphology and topology of the surface of the coatings, roughness, elemental and phase composition, microstructure and mechanical properties were investigated. Dependence of deposition parameters on surface morphology and elemental composition was demonstrated. Influence of the heavy negative charged Au À ions implantation on phase structure, microstructure and hardness of nitride (TiHfZrNbVTa)N coatings was investigated.

No abstract

No abstract

Abstract-It has been found that the phase with the fcc lattice of the NaCl structural type is formed due to the vacuum arc deposition of the nanostructured multicomponent (TiZrHfVNbTa)N coating. Implantation of negative Au -ions with a dose of 1 × 10 17 cm -2 leads to the formation of a disordered polycrystalline struc ture without a preferred orientation of the fcc phase and nanocrystallites from 5-7 to 1-3 nm is size, which are dispersed in a layer up to 35 nm in depth. Nanohardness increases to 33 GPa, and the Vickers hardness reaches 51 GPa. Gold nanoclusters are formed in the near surface region, while the fcc lattice and the for mation of local Au regions are observed in the coating itself. Fragments with the hcp lattice are formed at depths above 180 nm because of the low nitrogen concentration.

The results of new studies of creating protective oxide coatings based on Al 2 O 3 (Si, Mn) and deposited onto aluminum alloys using electrolyte-plasma oxidation are presented. An analysis is performed by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X ray diffraction, Rutherford backscattering of 4 He + and protons, nanoindentation, scratching, friction coefficient measure ments, and acoustic emission measurements. The results demonstrate that the deposited coatings have a high quality, hardness, and wear resistance and a low thermal diffusivity. Apart from Al 2 O 3 , the coatings are found to have Si, Mn, C, and Ca. The stoichiometry of the coatings is determined. The density and hardness of the coatings are close to those of α Al 2 O 3 in the coating on an Al-Cu (D 16) substrate, and these values of the coating on an Al-Mg (S006) are lower by a factor of 1.5.

Abstract-The nitrides of high entropy alloys, (TiZrAlYNb)N, fabricated by cathodic vacuum arc evapora tion are studied with electron microscopy, atomic force microscopy, laser scanning microscopy; energy dis persive X ray analysis, X ray phase analysis, time of flight secondary ion mass spectrometry; and hardness measurements. It is found that the deposition parameters influence the structure, surface morphology, ele ment distribution, and mechanical properties. The structural-phase state of the coatings before and after the ion implantation of heavy negative gold ions Au -are compared.