Influence of intense bombardment of Cu{+} ions on microhardness and structure of VT-23 titanium alloy

The structural-phase state of the ion-modified surface layer of the VT-23 titanium samples was investigated by TEM and SEM. The results of the surface modification of the VT-23 titanium alloy by the intense flux of copper ions with energy of 2 keV and the ion current density of 3.5 mA/cm{2} were studied. The dependence of the microhardness and the penetration depth of ions as a function of duration of ion treatment was determined. The microhardness was investigated by the nanoindentation method

Changes in the structure and wear resistance of the surface layer of copper under treatment by nitrogen ion beams

The structural-phase state of the treated sample surface was investigated by TEM. It was shown by the TEM and VIMS method that the improvement of tribological properties of the copper samples can be associated with an increase of relaxation ability due to a significant increase of the nitrogen concentration in it, which is accompanied by the refinement of fcc-Cu main phase grain structure and the formation of nanopores or gas bubbles in the ion-modified surface layer. A high-dose implantation of nitrogen ions and copper samples increases the wear resistance in 1.5-4.5 times together with a counterbody from the same material in the argon environment. The microhardness of the copper samples also increases

Internal stresses and structure of multilayer coatings on the basis of Zr-Y-O / Si-Al-N

X-ray and TEM research of the structure of multilayered coatings consisting of the alternating layers Si-Al-N and Zr-Y-O of equal thickness are carried out. It is shown that the boundaries between different layers are sharp enough, and the chemical composition in each layer is homogeneous. The phase composition of the layers on the basis of Zr-Y-O contains basicallynanocrystalline ZrO2 and the layers on the basis of Si-Al-N contain Si3N4 amorphous phase. The internal field of stresses is determined by X-ray and TEM analyses. It is established that thecrystal lattice curvaturetorsion and the internal elastic stresses depend on the grain cross-section size of the Zr-Y-O layer

Internal stresses and structure of multilayer coatings on the basis of Zr-Y-O / Si-Al-N

X-ray and TEM research of the structure of multilayered coatings consisting of the alternating layers Si-Al-N and Zr-Y-O of equal thickness are carried out. It is shown that the boundaries between different layers are sharp enough, and the chemical composition in each layer is homogeneous. The phase composition of the layers on the basis of Zr-Y-O contains basicallynanocrystalline ZrO2 and the layers on the basis of Si-Al-N contain Si3N4 amorphous phase. The internal field of stresses is determined by X-ray and TEM analyses. It is established that thecrystal lattice curvaturetorsion and the internal elastic stresses depend on the grain cross-section size of the Zr-Y-O layer

The fine structure of coatings on the basis Ni-Al formed by the magnetron method

Phase composition, fine structure and surface morphology of intermetallic coatings are investigated by X-ray analysis and TEM. It is shown that Ni[3]Al is the main phase of the intermetallic coating for all the investigated samples. There is a Ni-Al phase in the samples of the first type. Three types of grains, differing in size, are discovered in the structure of nanocrystalline coatings: dislocation free, dislocation, and fragmented. The internal stresses, obtained by TEM and X-ray analysis, have close values

Changes in the structure and wear resistance of the surface layer of copper under treatment by nitrogen ion beams

The structural-phase state of the treated sample surface was investigated by TEM. It was shown by the TEM and VIMS method that the improvement of tribological properties of the copper samples can be associated with an increase of relaxation ability due to a significant increase of the nitrogen concentration in it, which is accompanied by the refinement of fcc-Cu main phase grain structure and the formation of nanopores or gas bubbles in the ion-modified surface layer. A high-dose implantation of nitrogen ions and copper samples increases the wear resistance in 1.5-4.5 times together with a counterbody from the same material in the argon environment. The microhardness of the copper samples also increases

High-Temperature TEM investigation of the phase composition and structure of the Zr-Y-O/Si-Al-N multilayer coatings

Deposition of nanostructured multi-layered coatings on the basis of Zr-Y-0 was implemented by the pulse magnetron methods. Structural-phase states and morphology of the nanostructured coatings were investigated by SEM and the high-temperature TEM method. The high-temperature TEM revealed the presence of reversible phase transition of the tetragonal phase to the monoclinic phase, which can ensure stress relaxation and closure of surface cracks

Влияние обработки высокоинтенсивным потоком ионов Zr на структуру и механические свойства высокопрочной стали 30ХГСН2А

Исследование структуры модифицированного поверхностного слоя высокопрочной стали30ХГСН2А проводили с помощью оптической просвечивающей электронной микроскопии, а так жеметодов рентгеновской дифракции. Испытания на статическое и циклическое растяжение проводилидля стальных образцов в состоянии поставки, а так же после модификации поверхностного слояпотоком ионов Zr

Phase composition and structure of multilayered coatings of Ni-Al system

The nanostructured multilayer coating on the basis of the Ni-Al system is formed by magnetron sputtering. The structural-phase state of the coatings is studied by X-ray analysis. It is established that the coatings with different thickness of nanolayers has NiAl, Al[3]Ni, Ni[2]Al[3] phases and the solid solution of aluminium in nickel. There are different sets of these phases depending on the thickness of layers in the coatings

Obtaining Composite Zr-Al-O Coating on the Surface of Zirconium by Microplasma Oxidation

The paper describes the application of the microplasma oxidation for production of Zr-Al-O composition on the surface of zirconium. Certification of a new-type power supply for depositing oxide ceramic coatings by microplasma oxidation was also carried out. The growth rate of Zr-Al-O coating amounted around 0.2 nm/s, which around 10 times exceeds that for depositing similar coatings using the similar equipment. We have studied the change of surface morphology and the chemical composition of the formed ceramic coating by means of EVO 50 scanning electron microscope and X-ray spectral analysis