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Velikanova T.A.,Frantsevich Institute for Problems of Materials Science | Karpets M.V.,Frantsevich Institute for Problems of Materials Science | Kuprin V.V.,Frantsevich Institute for Problems of Materials Science | Turchanin M.A.,Donbass State Mechanical Engineering Academy
Powder Metallurgy and Metal Ceramics | Year: 2010

The β-Mn structure (π-phase) is revealed on contact and free surfaces of Fe63Mo37 melt-spinning ribbons. The full-profile analysis (Rietveld analysis) of diffraction patterns for a mixture of polycrystalline phases has identified, along with the metastable π phase, bcc solid solutions, μ and σ phases, and an intermediate bcc phase in the Fe-Mo phase diagram. © 2010 Springer Science+Business Media, Inc.


Velikanova T.A.,Frantsevich Institute for Problems of Materials Science | Karpets M.V.,Frantsevich Institute for Problems of Materials Science | Turchanin M.A.,Donbass State Mechanical Engineering Academy | Agraval P.G.,Donbass State Mechanical Engineering Academy
Powder Metallurgy and Metal Ceramics | Year: 2010

The CALPHAD method is used for the thermodynamic modeling of metastable phase transformations in the Fe-Mo system. The relative thermodynamic stability of metastable α and β Mn-like phases and stable phases of the system are assessed. The Gibbs energy of intermetallic compounds with a homogeneity range is described within the Compound Energy Formalism. The calculated versions of Fe-Mo metastable phase diagrams interpret correctly the phase relationships in high-speed solidification of 63Fe37Mo alloy. © 2010 Springer Science+Business Media, Inc.


Turchanin M.A.,Donbass State Mechanical Engineering Academy | Dreval L.A.,Donbass State Mechanical Engineering Academy | Abdulov A.R.,Donbass State Mechanical Engineering Academy | Agraval P.G.,Donbass State Mechanical Engineering Academy
Powder Metallurgy and Metal Ceramics | Year: 2011

The mixing enthalpies of ternary Cu-Fe-Co liquid alloys are studied by the calorimetric method at 873 K and x Co=0-0.55. Thermodynamic assessments of the Fe-Co and Cu-Fe-Co systems are carried out with the CALPHAD method. A set of self-consistent thermodynamic parameters of the phases is obtained using data on the mixing enthalpies established in this study and published information on phase transformations. Isothermal and vertical sections of the phase diagram, liquidus and solidus surfaces, and metastable miscibility gap for overcooled liquid alloys are calculated. The undercooling degrees for the metastable liquid phase separation and temperature-composition ranges of the formation of the supersaturated solid solutions during the liquid quenching have been assessed. © 2011 Springer Science+Business Media, Inc.


Velikanova T.A.,Frantsevich Institute for Problems of Materials Science | Karpets M.V.,Frantsevich Institute for Problems of Materials Science | Agraval P.G.,Donbass State Mechanical Engineering Academy | Turchanin M.A.,Donbass State Mechanical Engineering Academy
Powder Metallurgy and Metal Ceramics | Year: 2011

Evolution of the phase composition of Fe-Mo-C spinning alloys is investigated in situ with hightemperature x-ray diffraction from room temperature to solidus. The temperature range over which the metastable β-Mn-like phase exists is determined. It is shown that the γ-Fe-based fcc-phase and Mo 2C-based solid solution coexist in equilibrium at 1273 K and the γ-phase and η-carbointermetallide of W 3Fe 3C type coexist with the liquid phase at 1473 K. The vertical section at 11 at.% carbon is plotted. © 2011 Springer Science+Business Media, Inc.

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