Effects of irradiation of stainless steel and TiMoN coatings on stainless with lowenergy Alpha-particles, Krypton and Xenon ions

One of the directions for development of new structural materials for nuclear installations is deposition of protective coatings with high stability of physical and mechanical properties to ionizing irradiation on the existing structural materials. In particular, this applies to the nuclear reactors of generation IV, among which are considered as promising reactors with liquid metal and gas coolant..

Effects of irradiation of stainless steel and TiMoN coatings on stainless with lowenergy Alpha-particles, Krypton and Xenon ions

One of the directions for development of new structural materials for nuclear installations is deposition of protective coatings with high stability of physical and mechanical properties to ionizing irradiation on the existing structural materials. In particular, this applies to the nuclear reactors of generation IV, among which are considered as promising reactors with liquid metal and gas coolant..

Spectral analysis of the structure of ultradispersed diamonds

The structure of ultradispersed diamonds (UDD) is studied by spectral methods. The presence of diamond crystal phase in the UDD is found based on x-ray analysis and Raman spectra. The Raman spectra also show sp2- and sp3-hybridized carbon. Analysis of IR absorption spectra suggests that the composition of functional groups present in the particles changes during the treatment

Упругие свойства наноструктурированных материалов и их радиационная стойкость

Young’s modulus of the nc-TiN/a-Si3N4 nanocomposite has been calculated depending on a size and a volume fraction of the nanocrystalline phase. The elastic moduli of a-Si3N4 matrix and nc-TiN nanocrystals as well as their relation show that they play an important role in the total elastic modulus of the nanocomposite. The kinetics of the defect structure during nanocomposite irradiation was investigated taking into account the recombination processes and sinks on the nanocrystals. Проведены расчеты модуля Юнга наноструктурированного материала в зависимости от размеров и объемной доли нанокристаллов на примере объемного nc-TiN/a-Si3 N4 нанокомпозита. Показано, что определяющую роль здесь играют модули упругости a-Si3 N4 матрицы и самих nc-TiN нановключений и их соотношения. Исследована кинетика дефектной подсистемы с учетом рекомбинационных процессов и действия стоков, которыми являются нанокристаллы, при радиационном воздействии на нанокомпозит

ЭРОЗИЯ ПОВЕРХНОСТИ МНОГОСЛОЙНЫХ ПЛЕНОК НА ОСНОВЕ НИТРИДОВ ЦИРКОНИЯ И КРЕМНИЯ, ОБЛУЧЕННЫХ ИОНАМИ ГЕЛИЯ

The article is devoted to the investigation of surface erosion of ZrN/SiNx multilayer films irradiated with He ions (30 keV) and annealed in vacuum at 600 °C. It was found that multilayer ZrN/SiNx films remain resistant to blistering and flacking when irradiated with He ions (30 keV) up to a dose of 8∙1016 cm–2. The influence of the thickness of the crystalline and amorphous layer on the surface erosion nature and degree of multilayer films as a result of post-radiation annealing at 600 °C are revealed. The possible mechanisms of blistering and flexing in multilayer systems ZrN/SiNx are discussed in the work. Работа посвящена исследованию процессов эрозии поверхности многослойных пленок ZrN/SiNx , облученных ионами He (30 кэВ) и отожженных в вакууме при T = 600 °С. Выявлено, что многослойные пленки ZrN/SiNx остаются устойчивыми к образованию блистеров и отшелушиванию при облучении ионами He (30 кэВ) до дозы 8∙1016 см–2. Обнаружено влияние толщины кристаллического и аморфного слоя на характер и степень эрозии поверхности многослойных пленок в результате пострадиационного отжига при T = 600 °С. Обсуждаются возможные механизмы блистеринга и отшелушивания в многослойных системах ZrN/SiNx .

Flexoelectricity and apparent piezoelectricity of a pantographic micro-bar

We discuss a homogenized model of a pantographic bar considering flexoelectricity. A pantographic bar consists of relatively stiff small bars connected by small soft flexoelectric pivots. As a result, an elongation of the bar relates almost to the torsion of pivots. Taking into account their flexoelectric properties we find the corresponding electric polarization. As a results, the homogenized pantographic bar demonstrates piezoelectric properties inherited from the flexoelectric properties of pivots. The effective stiffness properties of the homogenized bars are determined by the geometry of the structural elements and shear stiffness whereas the piezoelectric properties follow from the flexoelectric moduli of the pivots