The Study of A New Symmetrical Rod Phase in Mg-Zn-Gd Alloys

Quasicrystal alloys have a wide application prospect because of excellent performances and characteristics; meanwhile, magnesium alloys are known as green engineering materials because of their high specific strength and light weight. Therefore, the study of Mg-Zn-Gd quasicrystal alloys is of great...

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Bibliographic Details
Published in:Symmetry (Basel) 2019-08, Vol.11 (8), p.988
Main Authors: Yue, Jianhang, Feng, Yun, Wu, Hao, Zhou, Guorong, Zuo, Min, Leng, Jinfeng, Teng, Xinying
Format: Article
Language:English
Subjects:
Differential scanning calorimetry
Diffraction patterns
Gadolinium
Heat treatment
Lamellar structure
Light
Magnesium alloys
Magnesium base alloys
Melt temperature
Metallurgy
Mg-Zn-Gd alloys
Microhardness
morphologies and properties
Morphology
quasicrystal
Quasicrystals
symmetrical rod phase
Symmetry
Ternary systems
Thermal stability
Weight reduction
Zinc
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Summary:Quasicrystal alloys have a wide application prospect because of excellent performances and characteristics; meanwhile, magnesium alloys are known as green engineering materials because of their high specific strength and light weight. Therefore, the study of Mg-Zn-Gd quasicrystal alloys is of great significance for the development of new materials. In this paper, Mg(70-x)Zn30Gdx(x=3,4,5) alloys were prepared by a conventional casting method and the morphologies and properties of these alloys were studied. There was a new symmetrical rod phase found in the Mg66Zn30Gd4 alloy and the symmetrical rod phase was identified as a ternary phase by mapping scanning and energy dispersive spectroscopy (EDS) analysis. The Zn/Gd ratio of the symmetrical rod phase was found to be 4.8 and the TEM images obtained were different from the typical diffraction spots patterns of quasicrystalline, which means it is unlikely to be quasicrystalline. With different melt holding time, the symmetrical rod phase evolved gradually over time from a lamellar eutectic structure; differential scanning calorimetry (DSC), heat treatment, and microhardness tests showed that the melting temperature of the rod phase was 453 °C and that its thermal stability and microhardness are better than quasicrystalline. Hence, the symmetrical rod phase is a new kind of complex metallic alloy phase whose composition and properties are close to those of quasicrystals but is not quasicrystalline.
ISSN:2073-8994
2073-8994
DOI:10.3390/sym11080988