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Open AccessArticle

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

by Lan Luo 1, Yong Liu 2,3,* and Meng Duan 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.
Materials 2018, 11(8), 1351; https://doi.org/10.3390/ma11081351
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)
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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MDPI and ACS Style

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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