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

IF 1.5 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2024-05-11 DOI:10.1007/s11669-024-01111-0

Ruyi Jiang, Xiaofen Duan, Dashi Li, Cuiyun He

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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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镁锑二元体系相平衡的再研究与热力学评估

通过 X 射线衍射、配备能量色散光谱仪的扫描电子显微镜和差示扫描量热法，对 Mg-Sm 相图进行了实验研究。证实在 Mg-Sm 系统中存在五种二元化合物：Mg41Sm5、Mg5Sm、Mg3Sm、Mg2Sm 和 MgSm。除了 Mg2Sm 和 MgSm 外，还发现 Mg3Sm 是一种同熔相。在这项工作中，发现 Mg5Sm 和 Mg2Sm 只在高温下稳定，并在 400 °C 以上分解。为了确定 Mg3Sm、Mg2Sm、MgSm 和 γ-Sm 的固溶范围，我们做出了特别的努力。根据本研究的新实验数据和所有可靠的文献实验信息，采用 Calphad 方法对 Mg-Sm 二元体系进行了建模。研究获得了 Mg-Sm 系统的完整热力学描述，并对计算数据和实验数据进行了广泛的比较，结果表明几乎所有可用的实验数据和理论数据的拟合都令人满意。

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来源期刊

Journal of Phase Equilibria and Diffusion 工程技术-材料科学：综合

CiteScore

2.50

自引率

7.10%

发文量

审稿时长

1 months

期刊介绍： The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts. The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use. Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.