N.S. Pushilina

Application of Automated Complex Gas Reaction Controller for Hydrogen Storage Materials Investigation

Automated complex Gas Reaction Controller and its application for hydrogen storage materials investigation are described in this article. Pressure-composition isotherms (PCI) and kinetics measurements of LaNi5 have been obtained for validation of the apparatus. Measurements of both absorption and desorption PCI curves and kinetics measurements at different conditions have been obtained for carbon nanotubes to estimate its hydrogen storage properties.

Investigation of Hydrogen Distribution from the Surface to the Depth in Technically Pure Titanium Alloy with the Help of Glow Discharge Optical Emission Spectroscopy

Optimal operating parameters for the study of titanium-hydrogen system with the help of glow discharge optical emission spectroscopy have been selected. Hydrogen distribution from the surface to the depth in technically pure titanium alloy after electrochemical hydrogen saturation has been studied.

Influence of hydrogen on the properties of Zr-1%Nb alloy modified by a pulsed electron beam

The influence of hydrogen and a pulsed electron beam on the properties of Zr-1%Nb alloy is studied. It is shown that electron beam processing results in the formation of martensite with an intricate morphology in the subsurface layer of the alloy. It is found that the amount of hydrogen penetrating into the modified alloy is twice as low as in the as-prepared material. In addition, the modified alloy is more stable against the hydrogen action.

Properties of the ZrO2 and TiO2 coatings deposited by plasma-assisted arc spraying onto an E110 zirconium alloy

The structure, the physicomechanical properties, and the hydrogen penetration in the volume of an E110 alloy with a ZrO2 or TiO2 coating deposited by a vacuum-arc plasma-assisted method are studied. These coatings increase the wear resistance, the hardness, and the adhesion properties of the zirconium alloy. The ZrO2 coating is found to decrease the rate of hydrogen absorption by a Zr-1% Nb alloy as compared to the initial material at a hydrogenation temperature of 450°C.

Effect of Pulsed Electron Beam Treatment and Hydrogen on Properties of Zirconium Alloy

The paper presents the results of the pulsed beam effect on the structure and phase composition of zirconium alloy. Such treatment is demonstrated to lead to forming of complex morphology martensite in the surface layer of the alloy. The processes of hydrogen absorption by zirconium alloy with modified surface have been studied. Modification of the samples is found to reduce the amount of hydrogen, absorbed by the volume of zirconium alloy during hydrogenation.

Properties of the VT1-0 titanium surface modified by a pulsed ion beam

The physicomechanical properties of the VT1-0 titanium surface modified by a pulsed carbon ion beam at a pulse duration of 80 ns, an energy of 200 keV, a current density of 120 A/cm2, an energy density of 1.92 J/cm2, and various numbers of pulses (four regimes) are studied. Irradiation by the beam leads to hardening of a 1.8-μm-thick surface layer in titanium, a decrease in the hydrogen sorption rate, a decrease in the grain size, and the formation of twins.

Structure and Properties of Zirconium Alloy after Modification by Pulse Ion Beam

Experimental results on the impact of pulsed ion beam with parameters the pulse duration 80 ns, energy of 200 keV and current density 120 А/сm2 , pulse energy ~ 1,5 J/сm2 on the alloy Zr1Nb on structure – phase state of the alloy of zirconium Zr1Nb. It is shown that such irradiation leads to changes in the structure of the surface and the hardening of the material.

The investigation of hydrogenation influence on structure changes of zirconium with nickel layer

The results of experimental investigation of hydrogenation influence on structure changes of zirconium alloy (Zr-1%Nb) with thin nickel layer have presented in this work. Nickel layer was formed by magnetron sputter deposition. Hydrogenation was carried out at gas atmosphere at constant temperature. Different hydrogen concentrations were obtained by varying time of hydrogenation. Defect and phase structure was studied by means of X-ray diffraction, glow discharge optical emission spectroscopy, positron lifetime and Doppler broadening spectroscopies. New experimental data about the evolution of the positron annihilation parameters depending on hydrogen concentration in Zr-1Nb alloy with nickel layer was obtained.

Influence of Manufacturing Parameters on Microstructure and Hydrogen Sorption Behavior of Electron Beam Melted Titanium Ti-6Al-4V Alloy

Influence of manufacturing parameters (beam current from 13 to 17 mA, speed function 98 and 85) on microstructure and hydrogen sorption behavior of electron beam melted (EBM) Ti-6Al-4V parts was investigated. Optical and scanning electron microscopies as well as X-ray diffraction were used to investigate the microstructure and phase composition of EBM Ti-6Al-4V parts. The average α lath width decreases with the increase of the speed function at the fixed beam current (17 mA). Finer microstructure was formed at the beam current 17 mA and speed function 98. The hydrogenation of EBM Ti-6Al-4V parts was performed at the temperatures 500 and 650 °С at the constant pressure of 1 atm up to 0.3 wt %. The correlation between the microstructure and hydrogen sorption kinetics by EBM Ti-6Al-4V parts was demonstrated. Lower average hydrogen sorption rate at 500 °C was in the sample with coarser microstructure manufactured at the beam current 17 mA and speed function 85. The difference of hydrogen sorption kinetics between the manufactured samples at 650 °C was insignificant. The shape of the kinetics curves of hydrogen sorption indicates the phase transition αH + βH→βH.

Influence of surface state on hydrogen sorption by zirconium alloy Zr1Nb

This work is focused on the investigation of hydrogen sorption behavior by zirconium alloy Zr1Nb with different surface states. Zirconium alloy samples in initial state, after ion cleaning with subsequent nickel deposition and after treatment by Low Energy High Current Pulsed Electron Beam (LEHCPEB) were hydrogenated at constant pressure and different temperatures. Hydrogen sorption rates as well as the energy of hydrogen adsorption by zirconium alloy with different surface states have been evaluated. It was shown, that ion cleaning with subsequent nickel deposition leads to the hydrogen sorption rate increasing at temperatures 350 – 550 °C, while the energy of hydrogen adsorption by zirconium alloy reduces on 15%. Modification by LEHCPEB leads to the hydrogen sorption rate decreasing at temperatures 350 – 550 °C, while the energy of hydrogen adsorption by zirconium alloy grows on 15%.