Structure of the phase equilibrium diagrams of aluminum alloys with scandium

The characteristics of a number of phase equilibrium diagrams of systems containing aluminum and scandium (Al−Sc, Al−(Li, Mg, Zr, Mn, Cu, Zn, Si)−Sc, Al−Mg−(Li, Zr)−Sc) were investigated in the high-aluminum range. A small, but significant, solubility of scandium in solid aluminum was observed, which was little affected by the presence of a third component. Ternary compounds in equilibrium with solid aluminum formed in only two of the systems investigated.