Thermodynamic optimization of the Li–Mg and Al–Li–Mg systems

The thermodynamic reassessment of the Li–Mg system has been performed by considering the latest experimental data. A noticeable improvement for the description of the experimental phase diagram and thermodynamic data has been made in the present description of the Li–Mg system compared with the previous assessments. The artificial phase equilibria, which exist in the previous optimization, have been eliminated. The obtained thermodynamic description for the Li–Mg system is then combined with those for the Al–Mg and Al–Li systems to form a basis for a ternary assessment. A set of self-consistent thermodynamic parameters for the Al–Li–Mg system is then obtained. Comparisons between the calculated and experimental results in the Al–Li–Mg system show that the present description can account for the experimental data satisfactorily.