Rare Metals

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Phase equilibria of low-Y side in Mg–Zn–Y system at 400 °C

  • Bo-Shu Liu
  • Hong-Xiao Li
  • Yu-Ping Ren
  • Min Jiang
  • Gao-Wu Qin
Article
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Abstract

Phase equilibrium relations of the Mg–Zn–Y system in the low-Y side at 400 °C were investigated by alloy-equilibrated method, combined with thermal analysis. The results show that there is a liquid phase which could be in equilibrium with an α-Mg solid solution and an icosahedral quasicrystal I phase in the low-Y side of the Mg–Zn–Y system at 400 °C. The liquid phase region originates from the binary Mg–Zn system and extends to 0.4 at%Y in the Mg–Zn–Y system. Besides, the hexagonal structure H phase, fcc W phase and LPSO phase (X phase) are in equilibrium with α-Mg. With Y/Zn (atomic ratio, the same as follows) increasing, there exist four three-phase regions consisting of I + liquid + α-Mg, I + H + α-Mg, H + W + α-Mg and W + X + α-Mg, respectively, in the low-Y side of the isothermal section at 400 °C. The two-phase region α-Mg + I phase exists between I + H + α-Mg and I + liquid + α-Mg. In this two-phase region, the Y/Zn ratio is in the range of 0.14–0.17; and a three-phase region of α-Mg + I phase + H phase appears when Y/Zn ratio comes up to 0.17–0.27. Not I but W phase is in equilibrium with α-Mg, when Y/Zn ratio > 0.27. The system is in liquid-state phase equilibrium, when Y/Zn ratio < 0.14.

Keywords

Mg–Zn–Y system Phase equilibrium Icosahedral quasicrystal phase Solid solubility 

Notes

Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51271053 and 5137104 and the National Key Research and Development Program of China (No. 2016YFB0701202).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory for Anisotropy and Texture of Materials, Ministry of EducationNortheastern UniversityShenyangChina

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