Frantsevych Institute for Problems of Materials Science

Kiev, Ukraine

Frantsevych Institute for Problems of Materials Science

Kiev, Ukraine
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Bilobrov Y.M.,NASU G.V. Kurdyumov Institute For Metal Physics | Trachevskii V.V.,NASU G.V. Kurdyumov Institute For Metal Physics | Trachevskii V.V.,Ukrainian Academy of Sciences | Bondar A.A.,Frantsevych Institute for Problems of Materials Science | And 4 more authors.
Journal of Phase Equilibria and Diffusion | Year: 2014

Alloys of the Ti-Si-B system in the Ti5Si3 vicinity melted in an arc furnace from pure components were studied after annealing at 1850 °C for 3 h by means of XRD analysis, scanning electron microscopy with electron probe microanalysis (SEM/WDS), and 11B solid state nuclear magnetic resonance (NMR). The phase based on Ti5Si3 (D88 crystal structure of the Mn5Si3 or Hf 5CuSn3 type), Ti5Si4 silicide (Sm5Ge4 crystal structure type) and TiB2 diboride were identified in the alloys. The NMR spectra contained two well-separated narrow peaks (at δ = 9 and δ = 274 ppm; Δν = 18 and Δν = 14 kHz) related to the B atoms located in the crystal lattices of TiB2 and solid solution based on Ti5Si 3 respectively, which stand out against a broad peak (δ = 150 ppm, Δν = 120 kHz) from B atoms which lack for a long-range order environment. The 11B spectra were used to determine boron contents in the constituents. The B content of the Ti5Si3-based phase determined from the integral intensity of proper narrow peaks is in agreement with SEM/WDS data (both about 5 at.%). © 2014 ASM International.


Potazhevska O.A.,Frantsevych Institute for Problems of Materials Science | Bondar A.A.,Frantsevych Institute for Problems of Materials Science | Duma L.A.,Frantsevych Institute for Problems of Materials Science | Soboliev V.B.,Ukrainian Academy of Sciences | Velikanova T.Y.,Frantsevych Institute for Problems of Materials Science
Journal of Phase Equilibria and Diffusion | Year: 2016

B-Mo-Nb alloys, as-cast and annealed at subsolidus temperatures, were experimentally studied by x-ray diffraction technique and scanning electron microscopy with electron probe microanalyses. Temperatures of incipient melting were measured by pyrometry after Pirani and Alterthum. No ternary compound was found in the examined alloys. Based on the experimental data, the B-Mo-Nb phase diagram was constructed for the first time, including liquidus and solidus surface projections and Scheil’s reaction scheme. © 2016 ASM International

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