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Microstructure and phase transformation of as-cast and annealed Mg–4Zn–1Y alloy containing quasi-crystal phase

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Abstract

By means of optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses, the microstructures of as-cast and heat-treated Mg–4Zn–1Y (wt%) alloy containing quasi-crystal phase were studied. The microstructure of the as-cast alloy consists of α-Mg solid solution grains, intermetallic particles and eutectic phases (W-phase and I-phase), and huge grains with serious dendritic segregation are clearly observed. After heat treatment, phase transformation and dissolution occur in the alloy and many phases remain. When the alloy was treated above 410 °C, the eutectic phases transform into spherical shape as the I-phase turns to W-phase. After heat treatment for long time, the alloy is over burnt and the W-phase decomposes to Mg–Y binary phase.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (Nos. 50835002 and 51105102).

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Authors and Affiliations

  1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing, 100012, China

    Yang Yang, Kui Zhang, Xing-Gang Li, Yong-Jun Li, Ming-Long Ma, Guo-Liang Shi & Jia-Wei Yuan

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  1. Yang Yang
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  2. Kui Zhang
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  3. Xing-Gang Li
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  4. Yong-Jun Li
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  6. Guo-Liang Shi
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  7. Jia-Wei Yuan
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Correspondence to Kui Zhang.

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Yang, Y., Zhang, K., Li, XG. et al. Microstructure and phase transformation of as-cast and annealed Mg–4Zn–1Y alloy containing quasi-crystal phase. Rare Met. 34, 239–244 (2015). https://doi.org/10.1007/s12598-014-0443-8

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  • DOI: https://doi.org/10.1007/s12598-014-0443-8

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