Phase Formation of Mg-Zn-Gd Alloys on the Mg-rich Corner
AbstractThe phase constitutions of as-cast magnesium (Mg)-Zn-Gd alloys (Zn/Gd = 0.25~60, Zn 0~10 at.%, Gd 0~2 at.%, 48 samples) were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The Mg-Zn-Gd phase diagram focused on the Mg-rich corner (with up to 20 at.% Zn, 10 at.% Gd) has been set up. Five regions can be classified as follows: (I) α-Mg+W-phase+(binary compounds), (II) α-Mg+W-phase+I-phase(+binary compounds), (III) α-Mg+I-phase(+binary compounds), (IV) α-Mg+binary compounds, and (V) α-Mg. The phase diagram has been verified by solidification behaviors observation using differential thermal analysis (DTA). Moreover, the structures of I-phase and W-phase in the alloy were explored in details. In terms of the Hume-Rothery rules, I-phase is confirmed as FK-type quasicrystalline with a chemical stoichiometry as Mg30±1Zn62Gd8±1 (at.%). The composition and lattice parameter a W-phase (fcc structure,
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Luo, L.; Liu, Y.; Duan, M. Phase Formation of Mg-Zn-Gd Alloys on the Mg-rich Corner. Materials 2018, 11, 1351.
Luo L, Liu Y, Duan M. Phase Formation of Mg-Zn-Gd Alloys on the Mg-rich Corner. Materials. 2018; 11(8):1351.Chicago/Turabian Style
Luo, Lan; Liu, Yong; Duan, Meng. 2018. "Phase Formation of Mg-Zn-Gd Alloys on the Mg-rich Corner." Materials 11, no. 8: 1351.
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