Dependence of Interphase Distribution Coefficients on Temperature and Concentration of Components in Double Metal Systems
In this work the computation of the equilibrium k0 and limiting k0limB distribution coefficients (DC) of the components according to the state diagrams of binary metal systems Mg–Ag, Ag–Mg, Al– Mg, Mg–Al, Ni–Ga, and Nb–Ge was achieved. These systems belong to systems with limited solubility and for them the approximating equations of the solidus and liquidus lines are obtained in the form of second-order polynomials in the temperature range from the melting point of the main component TMA to the eutectic temperature TEA. A mathematical analysis of the obtained equations for calculating DC is performed. For the first time by calculated and graphical methods the values of the limiting distribution coefficients k0limB for such systems as Mg – Al, Mg – Ag, and Al – Mg were determined. The complete coincidence of the k0limB values obtained by different methods is confirmed. For the Ag–Mg, Nb–Ge and Ni–Ga systems adjusted values of the limiting coefficient were obtained, which are in good agreement with the reference values. The dependences of the equilibrium distribution coefficients on temperature and concentration for the investigated systems are constructed. In the studied temperature range from TMA to TEA, a linear dependence of the distribution coefficients on temperature and concentration is observed.
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