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Phase Diagrams of the Zr–Si–RE (RE=La and Er) Ternary Systems at 773 K (500 °C)

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Abstract

The isothermal sections of the phase diagram of the Zr–Si–RE (RE=La and Er) systems at 773 K (500 °C) have been investigated using X-ray power diffraction (XRD), scanning electron microscopy (SEM), and optical microscopy (OM) with the aid of metallographic analysis. The existences of 10 binary compounds, namely ZrSi2, α-ZrSi, α-Zr5Si4, Zr3Si2, Zr2Si, RESi2, RESi2–x , RESi, RE5Si4, and RE5Si3 have been confirmed in the Zr–Si–RE (RE=La and Er) systems, respectively. As for the reported binary compound RE3Si2, only La3Si2 has been observed in the Zr–Si–La system, whereas Er3Si2 was not found. No binary compound was found in the Zr–RE binary systems, and no ternary compound was found in the current ternary systems. None of the phases in Zr–Si–La system reveals a remarkable solid solution at 773 K (500 °C). However, the maximum solid solubility of Zr in Er, Er5Si3, Er5Si4, ErSi, ErSi1.67, and ErSi2 is determined to be approximately 12.0 at. pct, 2.4 at. pct, 3.0 at. pct, 3.3 at. pct, 2.2 at. pct, and 1.8 at. pct, respectively. The maximum solid solubility of Er in ErSi2 is approximately 1.8 at. pct. No remarkable solid solubility of the elements in any of the other phases has been observed.

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Acknowledgments

The authors express thanks for the financial support from Guangxi Natural Science Foundation (1114003-1), the Guangxi Science and Technology Development Project (2011GXNSFA018017), the Plans for Construction of Scientific Topnotch and Innovation Team in Guangxi University, and the Opening Foundation of State Key Laboratory of Powder Metallurgy (2008).

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Authors and Affiliations

  1. Laboratory of Nonferrous Metal Materials and New Processing Technology, Ministry of Education, Guangxi University, Nanning, Guangxi, 530004, P.R. China

    Chunliu Li (Master), Yongzhong Zhan (Professor), Jia She (PhD), Qingxiao Huang (Master), Mingjun Pang (Master) & Wenchao Yang (Master)

  2. International Center for Materials Physics, Chinese Academy of Sciences, Shenyang, 10016, P.R. China

    Yongzhong Zhan (Professor)

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  1. Chunliu Li
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  2. Yongzhong Zhan
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Correspondence to Yongzhong Zhan.

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Manuscript submitted December 6, 2010.

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Li, C., Zhan, Y., She, J. et al. Phase Diagrams of the Zr–Si–RE (RE=La and Er) Ternary Systems at 773 K (500 °C). Metall Mater Trans A 43, 20–28 (2012). https://doi.org/10.1007/s11661-011-0845-2

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