ATOMIC MODELS OF THE STRUCTURE OF NIOBIUM SILICIDES IN NB-SI IN SITU COMPOSITES
E. N. Kablov1, N. A. Kuzmina1, N. N. Eremin2, I. L. Svetlov1, A. V. Neyman1
1All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russia
2Lomonosov Moscow State University, Moscow, Russia
Keywords: ниобий-кремниевые естественные композиционные материалы, жаропрочные сплавы, микроструктура, рентгеноструктурный анализ, внедрение стабилизирующих атомов, niobium-silicon natural composite materials, heat-resistant alloys, microstructure, single crystal X-ray diffraction analysis, introduction of stabilizing atoms
Abstract
The results of the investigation of the phase and quantitative composition of reinforcing phases of the Nb-Nb5Si3 in situ eutectic composite during high-gradient directional crystallization are reported. The crystal structures of the hexagonal γ and tetragonal α modifications of Nb5Si3 silicide are comparatively characterized. Possible structural positions for the stabilizing atoms in the structure of hexagonal silicide are proposed. The dependence of the creep deformation resistance on the silicide structure is discussed.
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