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Materials 2018, 11(8), 1351; https://doi.org/10.3390/ma11081351

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

1
,
2,3,* and 2
1
School of Materials Science and Engineering, Nanchang University, Nanchang 330001, China
2
Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province, Nanchang University, Nanchang 330031, China
3
Key Laboratory of Near Net Forming of Jiangxi Province, Nanchang University, Nanchang 330001, China
*
Author to whom correspondence should be addressed.
Received: 15 June 2018 / Revised: 29 June 2018 / Accepted: 3 July 2018 / Published: 3 August 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

The 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, m3¯m) 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. View Full-Text
Keywords: magnesium alloy; Mg-Zn-Gd alloy; quasicrystalline phase (I-phase); W-phase; microstructure magnesium alloy; Mg-Zn-Gd alloy; quasicrystalline phase (I-phase); W-phase; microstructure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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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.

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