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The phase equilibria and thermodynamic properties of the Al–Ge–Ni system are useful for understanding the diffusion process during the transient liquid phase (TLP) bonding. In this work, the thermodynamic description of the Al–Ge–Ni system over the whole composition and temperature ranges was performed by means of the CALPHAD (CALculation of PHAse Diagrams) method. The enthalpies of mixing of the...
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...
This paper focuses on the theoretical descriptions of the Gibbs energies concerning the unary systems of Antimony and Germanium. The Gibbs energy expressions of the vapor phase and the condensed phases are included in order to study the influences of temperature and pressure on the phase equilibrium status. The vapor phase is treated as a real solution of the constituent species by considering the...
The isothermal sections at 1073 and 1273K, and liquidus surface projection of the Ti–V–Zr system were investigated using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) and differential thermal analysis (DTA). Combined with experimental results in the present work and literature, the Ti–V–Zr system was optimized by the means of the CALPHAD...
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...
The Yb–Bi and the Yb–Te systems are thermodynamically assessed by CALPHAD approach based on the available experimental data including thermochemical properties and phase equilibria. All of the intermetallic phases in these two systems are treated as stoichiometric compounds due to their unnoticeable homogeneity ranges, and their formation enthalpies at 0K are calculated by the first-principles method...
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 CaO–CaF2, Al2O3–CaF2, and CaO–CaF2–Al2O3 systems are modeled using the CALculation of PHAse Diagram (CALPHAD) approach. The liquid phase is described by a two-sublattice ionic model (Al+3, Ca+2)p(F−, O−2, AlO3/2)q. The compounds Al2O3, CaF2, and CaO are treated as stoichiometric phases. The Gibbs energy of formation of (CaO)11(Al2O3)7(CaF2) is predicted by means of first-principles calculations...
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...
Based on the experimental measurements of the liquidus projection and the isothermal sections, the Nb–Si–W ternary system is thermodynamically assessed using the CALPHAD (CALculation of PHAse Diagram) approach. The parameters for the thermodynamic descriptions of all the phases in the system are optimized, following the reported descriptions of the three constituent binaries the Nb–Si, the Nb–W and...
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...
This paper describes the experimental study on liquidus projection and the isothermal section at 1873K of the Nb–Si–W ternary system in the Si-rich portion. The microstructures and solidification paths of the as-cast alloys were analysed. The constituent phases and their equilibrium compositions of the as-cast+heat-treated alloys were determined. The microstructure observation, the phase identification...
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