POSSIBILITIES FOR THE DEVELOPMENT OF A NEW GENERATION OF HEAT-RESISTANT ALLOYS STRENGTHENED BY NIOBIUM CARBIDES

The paper presents studies of the structure and mechanical properties of alloys hardened with niobium carbides at temperatures of 20–1500 °C. It is shown that the mechanical properties of the studied alloys are superior to the properties of highalloyed alloys of the Nb–Si system. The alloys demonstrated higher short.term and 100.hour strengths than Nb–Si system alloys at a temperature of 1500 °C. However, it was found that the alloys have low crack resistance.В работе представлены исследования структуры и механических свойств сплавов, упрочненных карбидами ниобия, при температурах 20–1500 °C. Показано, что механические свойства исследуемых сплавов превосходят свойства высоколегированных сплавов системы Nb–Si. Сплавы продемонстрировали более высокие, чем сплавы системы Nb–Si, кратковременную и 100.часовую прочность при температуре 1500 °C. Вместе с тем установлено, что сплавы обладают низкой трещиностойкостью.Работа выполнена в рамках проекта РФФИ 19-02-00434 А

Anisotropy in the inelastic neutron scattering from fcc NiH

A sample of nearly stoichiometric fcc nickel hydride in the form of polycrystalline plates with strong texture was studied by inelastic neutron scattering (INS) in two different orientations, with the [100] axis of the texture parallel and at an angle of 45° to the direction of neutron momentum transfer. The INS spectra were measured at 5 K with energy transfers ω ranging from 26 to 380 meV. In the region of the second and third band of optical hydrogen vibrations, they showed a significant directional dependence. A similar anisotropy was recently observed in the INS spectrum of fcc palladium hydride, and the now available data for NiH and PdH are discussed together