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Thermodynamic Assessment of the Mg–Ni–Si System

  • PHYSICOCHEMICAL MATERIALS RESEARCH
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Powder Metallurgy and Metal Ceramics Aims and scope

The thermodynamic assessment of the Mg–Ni–Si system has been developed in the framework of the CALPHAD method. The critical review of the literature data has been provided. A set of selfconsistent thermodynamic parameters for the phases in this ternary system is obtained using the phase diagram data available in the literature. The excess Gibbs energy term of solution phases is described using the Redlich–Kister polynomial. The sublattice model is used to describe the MgNi2 intermetallic phase having homogeneity range in the ternary system. Ternary intermetallic compounds are modelled as line compounds. Isothermal sections and liquidus surface, as well as the coordinates of the invariant reactions, are calculated. The calculated results are in satisfactory agreement with the experimental data. The calculated liquidus surface is extremely complex and contains 38 invariant reactions including 8 degenerated reactions and 10 invariant maxima. Most of the presented invariant reactions must be considered as approximate. The τ3 and τ5 phases melt congruently at 1544 and 1487 K, respectively. The τ4 forms via the peritectoid τ5 + NiSi + βNi2Si ↔ τ4 reaction at a temperature of 1193 K. According to our calculations, τ1 and τ8 melt at 1359 K (the L + τ5 ↔ τ1 reaction) and 1267 K (the L + τ1 ↔ τ8 reaction). The τ2 and τ6 are formed via the peritectic reactions at 1317 K (the L + τ3 + MgNi2 ↔ τ2 reaction) and at 1229 K (the L + τ5 + Mg2Si ↔ τ6 reaction), and the τ7 is formed via peritectoid Mg2Si + τ1 + τ5 ↔ τ7 reaction at 1279 K.

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Acknowledgements

The financial support from National Natural Science Foundation of China (Grant no. 51820105001) is acknowledged. Both Dr. Oleksandr Dovbenko and Dr. Liya Dreval thank the grant from Department of International Cooperation and Exchanges of Central South University, China for their visit to Central South University from September 1, 2018 to November 30, 2018.

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Authors and Affiliations

  1. State Key Lab of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, China

    Yinping Zeng, Yong Du & Shuhong Liu

  2. MSI, Materials Science International Services GmbH, Stuttgart, Germany

    L.O. Dreval & O.I. Dovbenko

  3. Donbas State Engineering Academy, Kramatorsk, Ukraine

    L.O. Dreval, P.G. Agraval & M.A. Turchanin

  4. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    O.I. Dovbenko

  5. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui, 232001, PR China

    Biao Hu

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  1. Yinping Zeng
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  2. L.O. Dreval
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  3. O.I. Dovbenko
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  4. Yong Du
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  7. P.G. Agraval
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  8. M.A. Turchanin
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Correspondence to Yinping Zeng.

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Published in Poroshkova Metallurgiya, Vol. 59, Nos. 3–4 (532), pp. 120–137, 2020.

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Zeng, Y., Dreval, L., Dovbenko, O. et al. Thermodynamic Assessment of the Mg–Ni–Si System. Powder Metall Met Ceram 59, 209–223 (2020). https://doi.org/10.1007/s11106-020-00153-6

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  • DOI: https://doi.org/10.1007/s11106-020-00153-6

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