Phase Formation of Mg-Zn-Gd Alloys on the Mg-rich Corner

The phase constitutions of as-cast magnesium (Mg)-Zn-Gd alloys (Zn/Gd = 0.25 similar to 60, Zn 0 similar to 10 at.%, Gd 0 similar to 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) alpha-Mg+W-phase+(binary compounds), (II) alpha-Mg+W-phase+I-phase(+binary compounds), (III) alpha-Mg+I-phase(+binary compounds), (IV) alpha-Mg+binary compounds, and (V) alpha-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 aW-phase (fcc structure, m (3) over barm) are affected by the composition of Mg-Zn-Gd alloys, especially by the Zn/Gd ratio of alloys. This work would be instructive for the design of Mg-Zn-Gd alloys to obtain the phase components, and then selected the strengthening ways, which could adjust its mechanical properties.