Thermodynamic modeling and diffusion kinetic experiments of binary Mg-Gd and Mg-Y systems
Thermodynamic modeling and diffusion kinetic experiments of binary Mg-Gd and Mg-Y systems
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DOI：
10.1016/j.actamat.2014.02.029
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发表时间：
2014-06-01
期刊：
影响因子：
9.4
通讯作者：
Jung, In-Ho
中科院分区：
文献类型：
--
作者：
Das, Sazol K.;Kang, Youn-Bae;Jung, In-Ho
使用 Mg 单晶进行 Mg-Gd 和 Mg-Y 体系的扩散偶实验，以研究在 703 至 803 K（430 至 530 C）温度下 Gd 和 Y 在六方密堆积 (hcp) Mg 中的各向异性扩散行为。 Gd 和 Y 沿 hcp Mg 基面的扩散系数大约是沿基面法线方向的扩散系数的三倍。 hcp Mg中Gd和Y的杂质扩散系数比Mg的自扩散系数和Al和Zn的杂质扩散系数低约一个数量级。确定了两个系统的中间相的生长常数和相互扩散系数。基于从当前扩散偶实验获得的相图数据和现有文献数据，还对 Mg Y 和 Mg Gd 体系进行了精确的热力学建模。 (C) 2014 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
Diffusion couple experiments for the Mg-Gd and Mg-Y systems were performed with Mg single crystals to investigate the anisotropic diffusion behavior of Gd and Y in hexagonal close packed (hcp) Mg at temperatures between 703 and 803 K (430 and 530 C). Diffusion coefficients for both Gd and Y along the basal plane of hcp Mg are approximately three times higher than those along the normal direction of the basal plane. The impurity diffusion coefficients of both Gd and Y in hcp Mg are lower than the self-diffusion of Mg and impurity diffusions of Al and Zn by about one order of magnitude. Growth constants and inter-diffusion coefficients of the intermediate phases for both systems were determined. Accurate thermodynamic modeling of the Mg Y and Mg Gd systems were also carried out based on the phase diagram data obtained from the present diffusion couple experiments and available literature data. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.