The molecular interaction volume model(MIVM) and the regular solution model have been applied to fit the activities of components in 37 binary solid alloys.

The data were correlated by the regular solution model using only one adjustable binary parameter, and the root mean square deviations of temperature are less than 1.1K. It implicates that the regular solution model can be used to predict the solid-liquid equilibria for the mixtures of nonpolar isomers with fair accuracy.

Based on the regular solution model and the previous reports,an evalution of the Gibbs energy of formation of ζ phase (when the stoichiometric components as Mn 4N) was expressed as follows:ΔG 0 Mn 4N =-110850(±3000)+64.714(±2.2) T(J/mol).

The phase diagram of Cu-Al system has been fully utilized to derive severalthermodynamic parameters of Cu-Al alloys on the basis of the regular solution model.

By using the regular solution model,the calculations of equilibrium composition X￣E in the deformed austenite→ferrite transformation in Fe-C-Mn alloy have been performed,and the influences of alloy compositions,temperature and deformation conditions on the volume free energy change △G_v of ferrite nucleation,were discussed in detail.

Gibbs free energy change for tetragonal(t) to monoclinic(m) martensitic transformation in ZrO_2 based ceramics containing CeO_2 and Y_2O_3 was calculated by the regular solution model. The martensitic transformation temperature was predicted, combined with the measured strength for this ZrO_2 containing ceramic.

The electric conductivity of 0. 5 XNa2O-(1-X)Li2O -0. 5P2O5 system glass changes obviously with the content of Na2O and Li2O. When xis spproximately equal to 0. 5,the electric conductivity decreases to the minimun. In this paper,the expression of the electric conductivity of the system glass is calculated by means of the regular solution model.

The calculation results for three crude oil systems from literature and the model crude oil system studied in this research by the modified thermodynamic model present in this work and the regular solution model proposed by Leelavanichkul are compared with theexperimental ones, it can be seen that not only for complicated crude oil systems but also for simple model system, the modified thermodynamic model is much better than the regular solution model proposed by Leelavanichkul for calculating the amount of wax precipitation under different temperatures.

A local composition activity coefficient model was proposed and applied to calculate the wax precipitation from crude oil. The calculation result was compared with that of the regular solution model.

The regular solution model describes the orthosilicate and the metasilicate solid solutions at 1373 K within experimental uncertainties.

The application of the compound energy model to crystalline ionic phases is discussed and compared with the regular solution model.

Using the regular solution model, the interfacial tension between the nucleus and substrate and, hence, the interfacial tension between nucleus and mother phase and thermodynamical potential of the compounds have been calculated.

In addition, the thermodynamic data in the slag system were assessed based on the regular solution model to mathematically describe the activities of chromium oxides in the slags.

The regular solution model was used to estimate the oxygen potential in the slag.

Based on the ideal solution and the regular solution model and by means of the analysis of the Gibbs, free energy of alloy systems, the thermodynamic principle for constructing phase diagrams is described, the numerical method for solving nonlinear equations is discussed, and the methods and stages for constructing phase diagrams are given. By using IBM-PC microcomputer, some binary phase diagrams such as Mo-Ru, Pt-Re, Nb-Os, W-Pd and Mo-Ir systems and some equitemperature sections of ternary phase diagrams...

Based on the ideal solution and the regular solution model and by means of the analysis of the Gibbs, free energy of alloy systems, the thermodynamic principle for constructing phase diagrams is described, the numerical method for solving nonlinear equations is discussed, and the methods and stages for constructing phase diagrams are given. By using IBM-PC microcomputer, some binary phase diagrams such as Mo-Ru, Pt-Re, Nb-Os, W-Pd and Mo-Ir systems and some equitemperature sections of ternary phase diagrams such as Mo- WOs, Re-Hf-Mo systems have been drawn. The comparison of the calculated phase diagrams with experimental ones has shown that the type, the form and the precision of the phase diagrams constructed depend on the free energy model, the expression as well as the relative thermodynamic parameters of the alloy systems.

Thermodyamics of Spinodal Decomposition in Cu-Ni-Sn System has been analyzed using the Thermodynamics criterion of spinodal decomposition in ternary system:G_(xx)(δX)~2+2G_(xy)(δXδy)+G_(yy_(δy)~2<0 Applying the regular solution model,the interaction parameters of binary systems are estimated and used to calculated the chemical spinodal solvus and the directions of composition fluctuation.It has been found that the spinodal decomposition at 623K in Cu-Ni-Sn alloys belongs to that so called“decomposition...

Thermodyamics of Spinodal Decomposition in Cu-Ni-Sn System has been analyzed using the Thermodynamics criterion of spinodal decomposition in ternary system:G_(xx)(δX)~2+2G_(xy)(δXδy)+G_(yy_(δy)~2<0 Applying the regular solution model,the interaction parameters of binary systems are estimated and used to calculated the chemical spinodal solvus and the directions of composition fluctuation.It has been found that the spinodal decomposition at 623K in Cu-Ni-Sn alloys belongs to that so called“decomposition restricted by the direction of composition fluctuation”.Both segregation of Ni and Sn play an important role during decomposition process.The experiments of TEM and SAXS prove that the spinodal decom-position does occur in Cu-15Ni-SSn alloy aged at 623K..

The phase diagram of Cu-Al system has been fully utilized to derive severalthermodynamic parameters of Cu-Al alloys on the basis of the regular solution model.Astatistical method has also been used to deal with α→α′and β→β′ ordering transitions ac-companying the martensitic transformation in Cu-Al alloys.The equilibrium temperaturesT_0~* and T_0,as well as M_s temperature have then been calculated theoretically in Cu-Alalloys with various compositions,and the M_s obtained are in good agreement with the...

The phase diagram of Cu-Al system has been fully utilized to derive severalthermodynamic parameters of Cu-Al alloys on the basis of the regular solution model.Astatistical method has also been used to deal with α→α′and β→β′ ordering transitions ac-companying the martensitic transformation in Cu-Al alloys.The equilibrium temperaturesT_0~* and T_0,as well as M_s temperature have then been calculated theoretically in Cu-Alalloys with various compositions,and the M_s obtained are in good agreement with the ex-perimental ones.The calculated results also show that the equilitrium temperature of theordered α′and β′phases,T_o,is higher than that of the disordered α and β phases,T_o~*.