The Al–Li–Si System: 2. Experimental Study and Thermodynamic Calculation of the Polythermal Equilibria

The ternary Al–Li–Si system was investigated experimentally by differential thermal analysis (DTA). Melting temperatures were established for the three ternary phases, LiAlSi (1), Li5.3Al0.7Si2 (2), and Li8Al3Si5 (3), found in part 1 of this work. Additionally selected ternary alloys were also studied by DTA. These results were combined with the phase relations examined in the first part of this work. Using all these data together with the available information from the literature the ternary phase diagram was calculated applying the Calphad method. Calculated invariant reactions and isothermal sections were compared with the experimental data. The stability of the phases depending on temperature is shown using various isothermal sections and the liquidus surface. The interpretation of experimental data concerning the results of the calculation is discussed.