| Microstructure and phase compositions of as-cast Mg–3.9Zn–0.6RE(Gd,Y) alloy with different Gd/Y ratios |
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| 作者姓名： | Yang Yang Kui Zhang Ming-Long Ma Jia-Wei Yuan |
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| 作者单位： | State Key Laboratory for Fabrication and Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals |
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| 基金项目： | financially supported by the National Natural Science Foundation of China(No.51204020);the National Basic Research Program of China(Nos.2013CB632202 and 2013CB632205) |
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| 摘 要： | Mg–Zn–RE(Gd, Y) alloys with different Gd/Y atomic ratios were prepared by conventional casting, and the microstructure of the alloys was studied by multiple means. Icosahedral quasicrystal phases are observed in all alloys. The different Gd/Y atomic ratios affect the microstructures of the alloys irregularly. The alloy with more Gd has large dendritic structure and more complicated phase composition which are composed of I-phase lamellar eutectic, W-phase divorced eutectic, Mg–RE cuboid particles and Mg–Zn binary phases. Other two alloys show similar microstructures and phase compositions with very thin lamellar eutectics which distribute along the interdendritic region, and the lamellar eutectics are formed by I-phase and Mg. The element contents of the I-phases and Mg–RE phases are partially controlled by the Gd/Y atomic ratio.
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| 关 键 词： | Mg–Zn–RE alloy Icosahedral quasicrystalline Microstructure Atomic ratio |
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