Thermodynamic assessment of the Al-Li system

In the present work a Calphad type thermodynamic assessment of the Al-Li system is presented. The system is dominated by the central AlLi phase, which has an ordered bcc (1332) structure. fcc Al dissolves considerable amounts of Li. If the fcc solid solution is quenched from high temperature, coherent metastable Al3Li precipitates with an ordered fcc (L1(2)) structure can form. There are two nearly stoichiometric phases; Al2Li3 and Al4Li9. The disordered fcc phase and the ordered Al3Li phase as well as the disordered bcc phase (Li) and the ordered AILi phase are described by four-sublattice models. There is a fairly complete set of experimental data available for this system, and most of them are satisfactorily described by the currently optimised parameters.