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December 20, 2021
Abstract
The Mg-rich phase equilibria in the Mg–Sc binary system have been established by experiments and thermodynamic modelling. The (Mg)-βSc two-phase region is of special interest, because the shape of the diagram proposed in the literature is thermodynamically not possible. A series of experiments have therefore been defined based on preliminary thermodynamic calculations. The c/a ratio of the lattice parameters within the (Mg) solid solution decreases monotonically. The measured liquidus temperatures of selected samples confirmed the literature values. The final thermodynamic modelling reproduces well the equilibria in the Mg-rich part of the Mg–Sc system. Our experimentally supported and calculated phase diagram differs considerably from the proposed diagram in the literature. Open questions still remain concerning the solid state equilibria in the Sc-rich part, where further experimental work is needed.