CONSTITUTION OF THE Al CORNER OF THE TERNARY Al–Ge–Mg PHASE DIAGRAM

Abstract

A fragment of the Al corner of the ternary Al–Ge–Mg phase diagram has been con-structed. Experimental methods have shown that the tie-line of the L ⇄ α-Al + Mg₂Ge three-phase eutectic equilibrium (that corresponds to the maximum temperature of eutectic transformation) does not coincide with the stoichiometric Al–Mg₂Ge section in the Al–Ge–Mg ternary system and is shifted to the magnesium-rich side of the ternary phase diagram. The concentration–temperature parameters of the univariant eutectic L ⇄ α-Al + Mg₂Ge transformation and the boundaries of two-phase α-Al + Mg₂Ge alloys after crystallization and annealing have been determined. The results will be used in the development of new aluminum casting alloys.