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Re-investigation of the Phase Equilibria and Thermodynamic Assessment of the Mg-Sm Binary System

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Abstract

The Mg-Sm phase diagram has been experimentally studied by x-ray diffraction, scanning electron microscope equipped with energy dispersive spectrometer, and differential scanning calorimetry. Five binary compounds, Mg41Sm5, Mg5Sm, Mg3Sm, Mg2Sm and MgSm were confirmed to exist in the Mg-Sm system. In addition to Mg2Sm and MgSm, Mg3Sm was found to be a congruently melting phase. The Mg5Sm and Mg2Sm were found to be only stable at high temperatures and decompose above 400 °C in this work. A special effort was made to determine the extent of the solid solubility ranges of Mg3Sm, Mg2Sm, MgSm and, γ-Sm. The Mg-Sm binary system was modeled using the Calphad approach based on new experimental data of this work and all reliable experimental information from literature. A complete thermodynamic description of the Mg-Sm system is obtained and extensive comparisons between calculated and experimental data are presented, indicating that almost all available experimental and theoretical data are fitted satisfactorily.

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Acknowledgments

Financial support from the National Natural Science Foundation of China under project numbers (No. 51061003 and No. 51461005) is gratefully acknowledged.

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Authors and Affiliations

  1. School of Resources Environment and Materials, Guangxi University, Nanning, 530004, Guangxi, People’s Republic of China

    Ruyi Jiang, Xiaofen Duan & Cuiyun He

  2. Nanning College for Vocational Technology, Guangxi, 530008, People’s Republic of China

    Dashi Li

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Correspondence to Dashi Li or Cuiyun He.

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This invited article is part of a special tribute issue of the Journal of Phase Equilibria and Diffusion dedicated to the memory of Thaddeus B. “Ted” Massalski. The issue was organized by David E. Laughlin, Carnegie Mellon University; John H. Perepezko, University of Wisconsin–Madison; Wei Xiong, University of Pittsburgh; and JPED Editor-in-Chief Ursula Kattner, National Institute of Standards and Technology (NIST).

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Jiang, R., Duan, X., Li, D. et al. Re-investigation of the Phase Equilibria and Thermodynamic Assessment of the Mg-Sm Binary System. J. Phase Equilib. Diffus. (2024). https://doi.org/10.1007/s11669-024-01111-0

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  • DOI: https://doi.org/10.1007/s11669-024-01111-0

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