Xue-min Yang, Jin-yan Li, Fang-jia Yan, Dong-ping Duan
Accurately, a thermodynamic model for calculating the mass action concentrations Ni of structural
units in Fe–Al binary melts describing activity or reaction ability of Al is a vital task in aluminum
refining process as well as in steelmaking processes as Al is one of common deoxidizing agents.
Beside activity aR, Al relative to pure liquid matter Al as standard state, the defined mass action
concentrations Ni of structural units by the atom and molecule coexistence theory, i.e., AMCT,
are also widely applied to describe reaction abilities. In this study melts based on the AMCT have
been developed and verified through comparing with the reported activities of both Al and Fe in
Fe–Al binary melts over a temperature from 1573 K to 1873 K from literature. The results indicate
that the calculated mass action concentration NAl of Al or NFe of Fe can be applied to accurately
describe the measured activity aR, Al of Al or aR, Fe of Fe in Fe–Al binary melts.
Thermodynamic Analysis on Reaction Abilities of Structural Units in Fe–Al Binary Melts Based on the Atom and Molecule Coexistence Theorys