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The issues just sent administered in researchers against Constantinople itself, only with a story of Bulgars, Avars and Gepids. The theoretical formulations of the model based on the formation of self-associates in binary liquid alloys as related to the various thermodynamic quantities, microscopic functions, transport and surface properties are presented in the next section.
This is followed by results and discussion in section 3, and conclusion in the last section. An understanding of Eq. The factor f n, W is responsible for the characteristic behavior of viscosity for a given binary alloy. In the light of Conformal solution [42, 44, 45], another expression for viscosity is written in terms of the enthalpy of mixing, H M as: 21 R is the universal gas constant.
Surface Properties: Surface Concentration and Surface Tension The grand partition functions set up for the surface layer and that of the bulk provides a link between the bulk and the surface properties within the frame of the statistical mechanical approach through the concept of layered structure near the interface [46, 47]. Results and Discussion The thermodynamic data used for the modelling of the bulk thermodynamic properties of liquid Cr-Mo and Cr-Fe alloys at K and K, respectively, were taken from [14, 22].
Table 1. In Fig. It can be noticed that there are fairly reasonable agreement between the calculated and experimental data especially below 0. Above these concentrations, the calculated values show some form of disagreement with experimental data. Since activity is one of the thermodynamic functions that can be measured directly from experiment, the inconsistencies observed could suggest further assessment of thermodynamic activity data of Cr-Mo liquid alloys.
On the other hand, Fig. Figure 1. Concentration dependence of component activities a Cr and a Mo in Cr-Mo liquid alloys computed using Eqs.
The solid lines denote calculated values. Concentration dependence of component activities a Cr and a Fe in Cr-Fe liquid alloys computed using Eqs. The solid lines denot calculated values. The degree of compound formation tendency in liquid alloys can be gauged by the normalized form of the Gibbs free energy of mixing of liquid phase at the equiatomic composition. From Fig. Also from Fig. The excellent agreement between the two sets of data also suggests that the choice of n and W used for the model calculations is quite reasonable.
Figure 3. The solid line denotes theoretical values, while times and stars denote experimental data  for Cr-Mo and Cr-Fe at respective temperatures. There exists a reasonable agreement between calculated and experimental values. We observed during the computation that if the interaction energy parameters are assumed to be temperature independent, i. The theoretical analysis reveals that the interaction energy parameter, W is temperature dependent. Figure 4. The deviation of S cc 0 from the ideal values Eq. If at a given composition, , there is a tendency of segregation.
On the contrary, refers to hetero-coordination. The theoretical values of S cc 0 are computed via Eq. The measured S cc 0 were determined from the experimental Gibbs free energy of mixing data taken from  when Eq. The results are shown in Fig.
www.obenef.com/includes/keylogger-iphone/turkcell-arama-gemii-goeruentueleme.html This suggests that both Cr-Mo and Cr-Fe are segregating liquid alloys. That is to say that homo-coordination of atoms preference for like atoms to be paired as nearest-neighbours exists in these molten alloy systems, which is consistent with positive values of the interaction energy parameter, W.
However, the positive deviation observed in S cc 0 behaviour for Cr-Fe liquid alloys at K in this work contrast sharply with the results of Novakovic and Brillo  who used the quasi-chemical approximation for regular alloys and reported that Cr-Fe alloys exhibited negative deviation with at K. Figure 6.
Concentration-concentration fluctuations at long wavelength limits, S cc 0 as a function of concentration for Cr-Mo and Cr-Fe liquid alloys at K and K, respectively. The dots denote the ideal values of S cc 0. It is found from Fig. Figure 7.
The phase separating tendency in Cr-Mo and Cr-Fe liquid alloys at K and K is maximum at the intermediate composition. Figure 8. To overcome this challenges, many theoretical models have been proposed for estimating viscosity [, ], but none of the existing models is universally applicable to estimate viscosity data for a large class of liquid alloy systems. In this work, the expressions of viscosity due to Singh and Sommer  through Eqs. The negative values of experimental enthalpy of mixing calculated using Eq.
As a rule, the compound forming systems are apt to exhibit maximum due to positive deviations in their isothermal viscosity [38, 46] in those composition ranges where intermetallic compounds are formed in the solid state. One would therefore expect for segregating alloys like Cr-Mo and Cr-Fe with positive H M , to exhibit negative deviations of isothermal viscosity [36, 38, 58] as seen in Fig.
The correlation between the calculated and experimental viscosity data shows a better agreement in Cr-Mo alloys than that of Cr-Fe liquid alloys.
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Surface Properties Using the parameters given in Tables 1 and 2 as input and the required activities as obtained from the relevant expressions in the model, the surface concentration of Cr has been computed by solving Eq. Table 2. S and Si for each atomic species of the alloy systems were computed using Eq.
The structural analysis shows that as bulk concentration of Cr in Cr-Mo liquid alloys increases, the surface concentration remain constant at about 0. At This is an indication that in the alloy there are more atoms of component with bigger atomic size i. Mo-atoms with atomic size of 9. Hence, at the surface of Cr-Mo, more Mo-atoms segregate at the surface in preference to Cr-atoms up to around On the other hand, the calculated values of surface concentration, , in Cr-Fe liquid alloys Fig.
The rate at which Cr- atoms segregates to the surface is nearly proportional to the rate at which it segregates to the bulk surface with the surface isotherm curve for Cr- Fe liquid alloys almost close to ideal mixture behaviour. This implies that Cr-atoms with lower value of surface tension with respect to Fe-atoms tend to segregate to the surface, while the Fe-atoms with higher surface tension value prefer to remain in the bulk in the molten alloy. A closer look at the surface isotherm curve also reveals that Cr-Fe liquid alloy exhibits a slight positive to negative deviations with respect to the ideality.
Figure The curves were computed via Eq. The dots denote the ideal values of the surface concentration, computed from:. Surface tension data of pure Cr, Mo and Fe metals were taken from . The surface tension isotherms of Cr-Mo and Cr-Fe liquid alloys exhibit negative deviations from corresponding ideal mixture isotherms as shown in Figs.
The dots labelled denote the ideal values of the surface tension obtained from the relation:. Cr-atoms Fig. The negative deviation between calculated surface tension isotherms of both systems and ideal values of the surface tensions substantiates earlier claim that the two liquid alloys are segregating systems. However, due to lack of experimental data at the investigation temperatures, it was impossible to compare the calculated surface tension values with experimental values.
Concluding Remarks The theoretical study shows positive deviation in the mixing properties from the ideal mixture behaviour indicating segregation in Cr-Mo and Cr-Fe liquid alloys.