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Preliminary experiments and phase diagram calculations were conducted to determine the equilibrium phase diagram of the Al–Mg2Si pseudobinary section. It was found that there is a narrow ternary phase field of Al+Mg2Si+liquid in the diagram. At the pseudoeutectic composition of Al–13.9 wt-%Mg2Si, a pseudoeutectic reaction takes place between the temperatures of 583.5 and 594°C. The solubility of Mg2Si in Al at 583.5°C is calculated as 1.91 wt-%.
Zhang et al. (Tue,) studied this question.