Al-Ca-Mg-Mn-Sr (Aluminum-Calcium-Magnesium-Manganese-Strontium)

Thermodynamic descriptions of the aluminum-magnesium-manganese-strontium system were reviewed. Preliminary calculations extrapolated from ternary descriptions were used to identify the invariant reactions in the quinary system. The centroid composition of an invariant reaction, which fully converts the reacting phases to the product phases and thereby yields the maximum heat effect, can also be found by calculation. A total of 45 transition-type reactions and one eutectic reaction were found by computation in the quinary region. Twelve out of these 46 reactions contain both liquid and (Mg) and pertain to Mg-rich alloys. The phase equilibria in the other five ternary systems were calculated by extrapolation from the corresponding binaries. The quinary equilibria were calculated by extrapolating the ternary descriptions, assuming the absence of quaternary and quinary phases.