Thermodynamic description of the Ce-Mg-Y and Mg-Nd-Y systems
Thermodynamic description of the Ce-Mg-Y and Mg-Nd-Y systems
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DOI：
10.3139/146.101685
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发表时间：
2008-06
影响因子：
0.8
通讯作者：
Cuiping Guo;Z. Du;Changrong Li
中科院分区：
文献类型：
--
作者：
Cuiping Guo;Z. Du;Changrong Li
本文用CALPHAD技术对Ce-Mg、Ce-Y、Mg-Nd、Nd-Y、Ce-Mg-Y和Mg-Nd-Y体系进行了热力学模拟和优化。用置换溶液模型描述了液相、体心立方相、面心立方相、六方密排相和双六方密排相。在Ce-Mg-Y和Mg-Nd-Y三元系中，具有B2结构的MgCe、MgNd和MgY等相形成连续的固溶体。考虑了体系中A2结构溶液与B2结构化合物之间的有序-无序转变，并建立了数学模型。Mg-R-Y系中的其它化合物Mg_2 Y、Mg_（24）Y_5、Mg_3R、Mg_（41）R_5、Mg_2 R和Mg_（12）Ce（R = Ce和Nd）表现出不同的第三组分溶解度。得到了Ce-Mg-Y和Mg-Nd-Y体系的自洽热力学描述。
Abstract The thermodynamic modeling and optimization of the Ce-Mg, Ce-Y, Mg-Nd, Nd-Y, Ce-Mg-Y and Mg-Nd-Y systems have been carried out by means of the CALPHAD technique. The solution phases, liquid, body-centered cubic, face-centered cubic, hexagonal close-packed and double hexagonal close-packed, were described by the substitutional solution model. The isostructural MgCe, MgNd and MgY phases with B2 structure form continuous range of solid solutions in the Ce-Mg-Y and Mg-Nd-Y ternary systems. The order-disorder transition between the solutions with A2 structure and compounds with B2 structure in the systems has been taken into account and thermodynamically modeled. The other compounds Mg2Y, Mg24Y5, Mg3R, Mg41R5, Mg2R and Mg12Ce (R = Ce and Nd) in the Mg-R-Y system exhibit different solubilities of the third component. A set of self-consistent thermodynamic descriptions of the Ce-Mg-Y and Mg-Nd-Y systems was obtained.