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The Al−Fe−Nb system was critically assessed by means of the CALPHAD technique. The solution phases (liquid, face-centered cubic and body-centered cubic) were modeled with the Redlich–Kister equation. The thermodynamic models of compounds Al13Fe4, Al2Fe and Al5Fe2 in the Al–Fe system and Al3Nb and AlNb3 in the Al–Nb system kept consistent with ones in the corresponding binary systems. The Fe2Nb and...
The V–Zr system was investigated by experiments and thermodynamic modeling. In experiments, 10 crucial alloys were selected, and the microstructure, crystal structure and phase transformation temperatures of the alloys were obtained using scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS), X-ray powder diffraction (XRD) and differential thermal analysis (DTA). A thermodynamic...
The Ga–Pt–Sb system was modeled using the CALPHAD (CALculation of PHAse Diagram) technique. Solution phases, liquid, fcc(Pt) and rhom(Sb), of the Ga–Pt–Sb ternary system were modeled with the substitutional solution model. The compounds, Ga6Pt, Ga7Pt3, Ga2Pt, Ga3Pt2, GaPt, Ga3Pt5, and GaPt2 of the Ga–Pt system, and PtSb2, PtSb, Pt3Prod. Type: FTPSb2, and Pt7Sb of the Pt–Sb system, were treated as...
On the basis of the experimental data of the phase equilibria and the thermochemical properties, a critical evaluation for the Ni–Sc binary system has been carried out using the CALPHAD (Calculation of Phase Diagrams) method. The associated model is used for the liquid phase containing the constituent species Ni, Sc and ScNi. The terminal solid solutions Fcc_A1 (Ni), Hcp_A3 (Sc), and Bcc_A2 (Sc) are...
The Co–Fe–Sb ternary system is critically assessed by CALPHAD (CALculation of PHAse Diagram) technique in the present work. The NiAs-type structure phase β-(Co,Fe)Sb with a wide non-stoichiometric range is described by three sublattices, (Sb)1/3(Co,Fe,Va)1/3 (Co,Fe,Va)1/3, following the extension of the sublattices of the phases β(CoSb) and β(FeSb) in the related binaries. The intermetallic compounds...
The Gd–Pb system was critically modeled by means of the CALPHAD technique on the basis of experimental data in the literature. Given the asymmetric shape of the liquidus in the Gd–Pb phase diagram, the associate model for the liquid phase was tested and compared with the substitutional solution model. The results of the optimization show that a better agreement with the available experimental data...
A complete thermodynamic description of the Bi–Mg–Sn ternary system was obtained by means of the CALPHAD (CALculation of PHAse Diagram) technique. The solution phases, Rhomb, Bct_A5 and Hcp_A3, are modeled with Redlich–Kister equation. The associate model has been used to describe the liquid phase with the constituents of the species Bi, Bi 2 Mg 3 , Mg, Mg 2 Sn and Sn. The...
The thermodynamic optimization of the Fe–Ti–V system was carried out using the CALPHAD technique. The solution phases (liquid, bcc, fcc and hcp) were modeled as substitutional solution. The compound Fe 2 Ti with C14 structure had a solubility of 34at% V at 1273K and was described as (Fe,Ti,V) 2 (Fe,Ti,V) by a two-sublattice model in the Fe–Ti–V system. The compound FeTi with B2 crystal...
The thermodynamic reassessment of the Al–Mo–Si system was performed using the CALPHAD technique. The solution phases (liquid, bcc, fcc and diamond) were modeled as a substitutional solution. The compounds AlMo 3 in the Al–Mo system and Mo 3 Si in the Mo–Si system had the same A15 crystal structure, and were treated as one phase and described by a two-sublattice model (Al,Mo,Si)(Al,Mo)...
The thermodynamic properties of the Pd–Ti system were optimized using the CALPHAD (CALculation of PHAse Diagram) technique. The solution phases, liquid, bcc, fcc and hcp, were described by the substitutional-solution model. Both compounds Pd 2 Ti and PdTi 2 with tetragonal MoSi 2 -type structure were treated as one phase with the formula (Pd,Ti) 2 (Pd,Ti) by a two-sublattice...
Among the phase diagrams of six binary systems composed of alkali metals, Sodium (Na), Potassium (K), Rubidium (Rb) and Cesium (Cs), three of them, those of the Cs–K, Cs–Rb and K–Rb systems, indicate a complete range of solid solubility, and the other three, those of the Cs–Na, K–Na and Na–Rb systems, have the eutectic type characteristic. The computational thermodynamic descriptions of the six binary...
The Al–Li–Zn system was critically assessed using the CALPHAD technique. The solution phases (liquid, bcc, fcc and hcp) were described by the substitutional solution model. The compounds Al 2 Li 3 and Al 4 Li 9 in the Al–Li system had homogeneity ranges of Zn and were treated as (Al,Zn) 2 Li 3 and (Al,Zn) 4 Li 9 in the Al–Li–Zn system,...
The Mg–Sm, Gd–Sm and Gd–Mg–Sm systems were thermodynamically optimized using the CALPHAD technique. The solution phases, liquid, bcc, hcp and rhombohedral, were described by the substitutional solution model. The isostructural compounds, MgGd in the Gd–Mg system and MgSm in the Mg–Sm system with a B2 structure was assumed to form a continuous range of solid solutions in the Gd–Mg–Sm system. The order–disorder...
The Fe–Zr and Al–Fe–Zr systems were critically assessed by means of the CALPHAD technique. The solution phases, liquid, face-centered cubic, body-centered cubic and hexagonal close-packed, were described by the substitutional solution model. The compounds with homogeneity ranges, hex.- Fe 2 Zr, Fe 2 Zr, FeZr 2 and FeZr 3 in the Fe–Zr system, were described by the two-sublattice...
The phase equilibria and thermodynamic properties of the Cu–Pd system are optimized using the CALPHAD (CALculation of PHAse Diagram) technique. In the present work, the liquid and face-centered cubic (fcc) solution phases are modeled with the substitutional solution model. A two-sublattice model (Cu,Pd) 0.75 (Cu,Pd) 0.25 is applied to describe the ordered Cu 3 Pd phase, the...
The thermodynamic modeling and optimization of the Mg–Pr, Pr–Y binary systems and Mg–Pr–Y ternary system were critically carried out by means of the CALPHAD (CALculation of PHAse Diagram) technique. The solution phases (liquid, body-centered cubic, hexagonal close-packed and double hexagonal close-packed) were modeled with the Redlich–Kister equation. The Compound Energy Model has been used to describe...
Thermodynamic modeling and optimization of the Gd–Mg, Mg–Y, Gd–Y binary systems and the Gd–Mg–Y ternary system have been critically carried out by means of the CALPHAD (CALculation of PHAse Diagrams) technique. The solution phases (liquid, body-centered cubic, and hexagonal close-packed) are modeled with the Redlich–Kister equation. The Compound Energy Model has been used to describe the thermodynamic...
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