Data on the phase diagram of the Al-Li-Se system up to 15 mass % Li an
d 65 mass % Sc are presented. Polythermal and isothermal (at 450 degre
es C) cross sections are constructed. In equilibrium with the aluminum
solid solution are the phases AlLi and Al3Sc, which participate in no
nvariant eutectic equilibrium at 595 degrees C, The phase AILi is also
in equilibrium with the phases AI,Sc and AlSc.