Microstructure and phase Mg-3.9Zn-0.6RE （Gd, Y） compositions of as-cast alloy with different Gd/Y ratios

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 micro- structures of the alloys...

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Bibliographic Details
Published in:稀有金属：英文版 2015 (3), p.160-163
Main Author: Yang Yang Kui Zhang Ming-Long Ma Jia-Wei Yuan
Format: Article
Language:English
Subjects:
成分
显微组织
树枝状结构
比值
离异共晶
金具
铸态
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Summary: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 micro- structures 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 par- ticles and Mg-Zn binary phases. Other two alloys show similar microstructures and phase compositions with very thin lamellar eutectics which distribute along the inter- dendritic 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.
ISSN:1001-0521
1867-7185