Article ID Journal Published Year Pages File Type
1621546 Journal of Alloys and Compounds 2009 6 Pages PDF
Abstract

The phase equilibria and compositions in Mg-rich corner at 320 °C have been investigated in detail in the Mg–Zn–Al ternary system through the equilibrated alloy method by using X-ray diffraction (XRD), scanning electron microscopy (SEM) assisted with energy dispersive spectroscopy of X-ray (EDS). Besides the binary compounds Mg17Al12 (γ) and MgZn in equilibrium with α-Mg solid solution, there exist two ternary compounds Al5Mg11Zn4 (φ) and Mg32(Al, Zn)49 (τ). A new two-phase region (α-Mg + τ) has been experimentally identified. The whole composition region of the φ phase has been also obtained at 320 °C, i.e., ∼53.7–57.0 at.% Mg, ∼14.7–27.4 at.% Al, ∼17.7–30.5 at.% Zn. The solubility of Al in the α-Mg solid solution in equilibrium with the γ phase decreases due to the dissolution of Zn, while the solubility of Zn increases for the addition of Al when the MgZn/α-Mg phases are in equilibrium, compared to the Mg–Al and Mg–Zn binary systems, respectively. The maximum solubility of Zn in the γ phase and that of Al in the MgZn phase are both about 8.3 at.% in the Mg-rich corner. Moreover, the element Al mainly substitutes the Zn in the MgZn phase while the Mg content hardly changes.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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