Structure and Physicomechanical Properties of Nanostructured (TiHfZrNbVTa)N Coatings after Implantation of High Fluences of N⁺(10¹⁸cm^-2)

Abstract

New classes of high-entropy alloys, which consist of at least 5 main elements with atomic concentrations 5-35 at.%, are under great interest in modern material science. It is also very important to explore the limits of resistance of high-entropy alloy nitrides to implantation by high-energy atoms. Structure and properties of nanostructured multicomponent (TiHfZrNbVTa)N coatings were investigated before and after ion implantation. We used the Rutherford backscattering, scanning electron microscopy with energy dispersive X-ray spectroscopy, high resolution transmission electron microscopy and scanning transmission electron microscopy with local microanalysis, X-ray diffraction and nanoindentation for investigations. Due to the high-fluence ion implantation (N + , the fluence was 10 18 cm −2 ) a multiphase structure was formed in the surface layer of the coating. This structure consisted of amorphous, nanocrystalline and initial nanostructured phases with small sizes of nanograins. Two phases were formed in the depth of the coating: fcc and hcp (with a small volume fraction). Nitrogen concentration reached 90 at.% near the surface and decreased with the depth. Nanohardness of the as-deposited coatings varied from 27 to 34 GPa depending on the deposition conditions. However, hardness decreased to a value of 12 GPa of the depth of the projected range after ion implantation and increased to 23 GPa for deeper layers.

Analysis of the Electroconsolidation Process of Fine-Dispersed Structures Out of Hot Pressed Al2O3–WC Nanopowders

“…where: θ 0 -initial porosity of the powder compact. Equation (10) demonstrates that the densification rate depends primarily on the applied pressure and viscosity of the material. Since the heating rate was very high, changes in viscosity and diffusion were not taken into consideration.…”

“…The efficiency of coatings is greatly influenced by the application process itself and the specific parameters of technological spraying. Therefore, research related to the proper selection of spray parameters in order to ensure the resistance of the coating to various deterioration processes is a current topic of many scientific papers [8][9][10][11][12].…”

Peculiarities of the Phase Formation during Electroconsolidation of Al2O3–SiO2–ZrO2 Powders Mixtures

“…Sintering is one of the most powerful technologies to obtain ceramics and cermets of starting powders [ 1 ]. Alumina Al 2 O 3 is one of the ceramic materials widely used in industrial applications [ 2 , 3 , 4 , 5 ]. Among refractories, the Al 2 O 3 –SiO 2 –ZrO 2 system is an important category, suitable for many applications, such as steel and glass manufacturing industries, due to their high refractory characteristics, chemical resistance, toughness, high-creep resistance and adequate thermo-mechanical performance [ 6 ].…”

Research into the Effect of Grain and the Content of Alundum on Tribological Properties and Selected Mechanical Properties of Polymer Composites

“…Furthermore, the material should meet both economic and environmental criteria (for future recycling) [ 6 ]. The simulations [ 7 , 8 ] and laboratory tests [ 9 , 10 , 11 ] comprehensively conducted over the manufactured engineering materials result from their later use in components of responsible structures of machinery or devices [ 12 ].…”