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

Abstract

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.