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Phase Equilibria of the Mg-Gd-Ce System at 500 °C
Journal of Phase Equilibria and Diffusion ( IF 1.4 ) Pub Date : 2021-01-03 , DOI: 10.1007/s11669-020-00856-8
Tao Zhou , Honghui Xu , Hai-Lin Chen , Peisheng Wang

The phase equilibria of the Mg-Gd-Ce system at 500 °C were investigated by means of the electron probe microanalysis (EPMA) and x-ray diffraction (XRD) on equilibrated alloys. The existence of the so-called normal tetragonal CeMg 12 (I) and long-range ordered CeMg 12 (II) was confirmed in the present work. The following five three-phase equilibria were well determined: (1) (Mg) + CeMg 12 (I) + Ce 5 Mg 41 , (2) (Mg) + Ce 5 Mg 41 + GdMg 5 , (3) Ce 5 Mg 41 + GdMg 5 + (Ce,Gd)Mg 3 , (4) (Ce,Gd)Mg 3 + GdMg 2 + (Ce,Gd)Mg and (5) (Ce,Gd)Mg + (δCe) + (βCe). The solubility of Ce in GdMg 5 and in GdMg 2 was measured to be 7.8 and 8.7 at.% Ce, respectively. The solubility of Gd in CeMg 12 (I), in Ce 5 Mg 41 and in (δCe) were measured to be 1.0, 4.6 and 2.4 at.% Gd, respectively. Two continuous series of solid solutions form between GdMg 3 and CeMg 3 , and between GdMg and CeMg. The overall isothermal section at 500 °C was constructed based on the present data with a few extrapolations.

中文翻译:

Mg-Gd-Ce 系统在 500 °C 时的相平衡

通过电子探针微量分析 (EPMA) 和 X 射线衍射 (XRD) 在平衡合金上研究了 500 °C 下 Mg-Gd-Ce 系统的相平衡。目前的工作证实了所谓的正四方晶 CeMg 12 (I) 和长程有序 CeMg 12 (II) 的存在。确定了以下五个三相平衡:(1) (Mg) + CeMg 12 (I) + Ce 5 Mg 41 ,(2) (Mg) + Ce 5 Mg 41 + GdMg 5 ,(3) Ce 5 Mg 41 + GdMg 5 + (Ce,Gd)Mg 3 , (4) (Ce,Gd)Mg 3 + GdMg 2 + (Ce,Gd)Mg 和 (5) (Ce,Gd)Mg + (δCe) + (βCe )。Ce在GdMg 5 和GdMg 2 中的溶解度分别测量为7.8和8.7原子%Ce。Gd 在 CeMg 12 (I)、Ce 5 Mg 41 和 (δCe) 中的溶解度分别测量为 1.0、4.6 和 2.4 at.% Gd。GdMg 3 和CeMg 3 之间形成两个连续系列的固溶体,在 GdMg 和 CeMg 之间。500 °C 下的整体等温截面是根据现有数据和一些外推法构建的。
更新日期:2021-01-03
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