Donbass State Mechanical Engineering Academy

Kramators’k, Ukraine

Donbass State Mechanical Engineering Academy

Kramators’k, Ukraine
SEARCH FILTERS
Time filter
Source Type

Agraval P.G.,Donbass State Mechanical Engineering Academy | Dreval L.A.,Donbass State Mechanical Engineering Academy | Turchanin M.A.,Donbass State Mechanical Engineering Academy
Powder Metallurgy and Metal Ceramics | Year: 2017

The literature data on the enthalpies of mixing and thermodynamic activities of Fe–Ti, Fe–Zr, and Fe–Hf liquid alloys are summarized. It is shown that the thermodynamic properties of these systems are characterized by significant negative deviations from the ideal behavior. In the framework of the associated solution model, the composition and temperature dependences of the thermodynamic functions of mixing for the Fe–Ti, Fe–Zr, and Fe–Hf systems are described. The temperature dependence of the thermodynamic properties of the considered systems is characterized by increase in negative deviations from the ideality with decreasing temperature and increasing thermodynamic stability of supercooled melts. Analysis of the degree of short-range order in the system melts, estimated as the total mole fraction of associates Σxass at the glass transition temperature, allows us to successfully interpret the known composition ranges of glass transition for the Fe–Zr and Fe–Hf melts and predict the composition range of glass transition for the Fe–Ti melts. © 2017 Springer Science+Business Media New York


Storchak-Fedyuk A.M.,Frantsevich Institute for Problems of Materials Science | Artyukh L.V.,Frantsevich Institute for Problems of Materials Science | Grytsiv A.V.,University of Vienna | Agraval P.G.,Donbass State Mechanical Engineering Academy | And 2 more authors.
Powder Metallurgy and Metal Ceramics | Year: 2017

Alloys of the ternary Cu–Ti–Zr system with 50–100 at.% Cu, annealed at 750°C, are studied by scanning electron microscopy, electron microprobe analysis, and X-ray diffraction. The isothermal section at 750°C is constructed in this composition range. A new hexagonal ternary phase of composition Cu63.5Ti14.5Zr22 is found. © 2017 Springer Science+Business Media, LLC


Agraval P.G.,Donbass State Mechanical Engineering Academy | Dreval L.A.,Donbass State Mechanical Engineering Academy | Turchanin M.A.,Donbass State Mechanical Engineering Academy
Powder Metallurgy and Metal Ceramics | Year: 2017

The partial mixing enthalpies of titanium, zirconium, and hafnium with liquid copper and iron alloys are studied by high-temperature calorimetry. The studies are carried out at a temperature of 1873 K along the sections with constant ratios xCu/xFe = 3, 1, and 1/3. Along all the studied sections, these functions are negative. The integral mixing enthalpies of components in the Cu–Fe–(Ti, Zr, Hf) systems along the studied sections are calculated by integrating the Gibbs–Duhem equation. The ΔH functions for ternary Cu–Fe–(Ti, Zr, Hf) melts are characterized by positive values in the vicinity of the binary Cu–Fe system and show negative values in a range of compositions with xMe > 0.1 (Me = = Ti, Zr, Hf). © 2017 Springer Science+Business Media, LLC


Storchak-Fedyuk A.M.,Frantsevich Institute for Problems of Materials Science | Artyukh L.V.,Frantsevich Institute for Problems of Materials Science | Duma L.A.,Frantsevich Institute for Problems of Materials Science | Agraval P.G.,Donbass State Mechanical Engineering Academy | And 2 more authors.
Powder Metallurgy and Metal Ceramics | Year: 2017

Optical and scanning electron microscopy, electron microprobe analysis, and X-ray diffraction are employed to examine alloys in the Cu–Ti–Zr ternary system, annealed at 750°C, with copper content from 0 to 50 at.%. A partial isothermal section of the phase diagram is constructed at 750°C in the composition range in question. The existence of a continuous series of solid solutions between CuTi2 and CuZr2 isostructural compounds (γ phase, MoSi2 type) is confirmed. The homogeneity ranges of Cu2TiZr ternary compound (τ1, MgZn2 type) and β-(Ti, Zr), (CuTi) (CuTi type), and CuZr (CsCl type) solid solutions are determined. © 2017, Springer Science+Business Media, LLC.


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.

Loading Donbass State Mechanical Engineering Academy collaborators
Loading Donbass State Mechanical Engineering Academy collaborators