Construction of Solidus Lines of Binary Metal Systems Having a Low Solubility of Components in the Solid Phase

Shcherban, A. P.; Datsenko, O.A.; Ковтун, Г. П.

doi:10.4236/ojmetal.2014.43008

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…The difference from systems with low solubility takes place in the determination of the equilibrium distribution coefficients k 0B necessary for calculations depending on the dissolution temperature. For systems with low solubility, the procedure for determining k 0B requires additional calculations [3][4][5]. Since experimentally constructed lines of solidus and liquidus of SD are known for systems with limited solubility, their analysis allows one to directly determine the values k 0B .…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Computation of Thermodynamic Parameters of Binary Metal Systems With Limited Solubility of Components In THE SOLID Α-Phase

Shcherban¹,

Datsenko²

2020

Problems of Atomic Science and Technology

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In the region of the primary solid α-phase for systems with limited solubility thermodynamic quantities such as the partial enthalpy of dissolution  B H  , the activity coefficients   В and the activities  B a in binary metal systems were calculated. The above mentioned indicated values were determined from the relations that connect these parameters with the equilibrium distribution coefficient k 0B and known thermodynamic quantities, such as the enthalpy variation mВ H  and entropy variation mВ S  during melting of component B. The calculation of equilibrium distribution coefficients using data from experimentally constructed solidus and liquidus lines of state diagrams was performed. The values and temperature dependences of the dissolution enthalpy for such systems as Ag-Mg, Nb-Ge, Mg-Al, Mg-Ag, Al-Mg, Ni-Ga, as well as the values and dependences of the activity coefficients   В and activities  B a of the second component on these systems were determined.

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Section: Formulation Of the Problemmentioning

confidence: 99%

Computation of Thermodynamic Parameters of Binary Metal Systems With Limited Solubility of Components In THE SOLID Α-Phase

Shcherban¹,

Datsenko²

2020

Problems of Atomic Science and Technology

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“…для каждой системы брали из работы [7]. Справочные данные для расчетов по энтальпии и энтропии плавления растворенного компонента взяты из работы [9].…”

Section: постановка задачиunclassified

DETERMINATION OF THERMODYNAMIC QUANTITIES OF BINARY METAL SYSTEMS WITH LOW SOLUBILITY OF COMPONENTS IN THE SOLID Α-Phase

Shcherban

Datsenko

2018

EEJP

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The method for determining the thermodynamic quantities: the partial enthalpy of dissolution , the activity coefficients and activities of the second component B in binary metallic systems with low solubility in the solid α-phase has been proposed. The algorithm for determining the above values is a sequence of preliminary calculations of the limiting and equilibrium distribution coefficients and construction of saturated solid solution lines for such systems with low solubility of the second component. Preliminarily obtained data are necessary for determining the partial enthalpy of dissolution and other quantities in the systems under study. Such a sequence of calculations is the proposed method for determining the thermodynamic parameters of dissolution. The values and temperature dependences of the dissolution enthalpy of component having a low solubility for such systems as Cd-Na, Cd-Tl, Te-Ga, Te-As, Te-Cu, Zn-Sn, as well as the activity coefficients and the activities of the second component in the saturating α-phase in these systems were determined. An analysis of obtained results on the enthalpy of dissolution shows that a change in the partial enthalpy with a change in the dissolution temperature is observed. When the temperature decreases from the melting point of the pure main component to the eutectic temperature, an increase in the partial enthalpies of dissolution of the second component is observed for studied systems. The Te-Ga system is characterized by a negative value . A negative value indicates an exothermic process of gallium dissolution in tellurium, in contrast to other systems in which the dissolution of the second component occurs with heat absorption. Analyzing the enthalpy of dissolution in the systems under study, it should be noted that the low values of < 2000 J/mol are characterized by the systems Cd-Na and Te-Ga. For systems Te-Cu, Te-As, Te-Tl, Zn-Sn > 15000 J/mol. Systems with a value > 15000 J/mol reveal a tendency to the occurrence of retrograde solubility in them. The difference in values is found to be more than two orders of magnitude for different systems.

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Analytical approximation and numerical simulation of liquidus for non-equilibrium multi-component eutectic systems

Афанасьева

Афанасьева²,

Egorova³

2022

Vestnik of Samara State Technical University. Technical Science

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In the first part of the article, the methods of analytic approximation of melting curves for two-component systems and their visualization by means of computer graphics are considered. For two-component systems, a method is proposed for the approximate construction of a melting curve, based on their by approximation of polynomials of the first and second degree. The diagrams obtained by solving the Schroeder Le Chatelier system and the liquidus curves constructed on the basis of their approximation by polynomials are compared. The value of the maximum deviation of these approximations from each other is given. The errors of the diagrams of two systems are considered separately: Ba(ClO4)2 KClO4 and BaF2 BaSO4, obtained experimentally and constructed using a system of Schroeder Le Chatelier equations and their approximation by polynomials of the first and second degree. In the second part of the article, a method is proposed to construct crystallization surfaces for three-component systems based on the approximate formulas for calculation eutectic characteristics of the two-component and three-component systems, and the linear approximations of the three-component systems isotherms. Based on the proposed approximation procedure, a method for calculating the composition and temperature of eutectic for two-component systems, and the construction of three-component system isotherms in the Delphi visual programming environment with the user interface is created. The table of errors of the eutectic characteristics calculations for three-component systems is given. The results of visualization of numerical simulation of liquidus surfaces for three-component eutectic systems and their comparison with experimentally obtained samples of crystallization surfaces for two systems: Ba(ClO4)2 KClO4 and BaF2 BaSO2 are presented.

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Construction of Solidus Lines of Binary Metal Systems Having a Low Solubility of Components in the Solid Phase

Cited by 5 publications

References 3 publications

Computation of Thermodynamic Parameters of Binary Metal Systems With Limited Solubility of Components In THE SOLID Α-Phase

Computation of Thermodynamic Parameters of Binary Metal Systems With Limited Solubility of Components In THE SOLID Α-Phase

DETERMINATION OF THERMODYNAMIC QUANTITIES OF BINARY METAL SYSTEMS WITH LOW SOLUBILITY OF COMPONENTS IN THE SOLID Α-Phase

Analytical approximation and numerical simulation of liquidus for non-equilibrium multi-component eutectic systems

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