Phase equilibria of the Mg–La–Nd system at 500 °C
Phase equilibria of the Mg–La–Nd system at 500 °C
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DOI：
10.1016/j.jallcom.2013.09.166
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发表时间：
2014-02
影响因子：
6.2
通讯作者：
Fan Zhang;Hong-hui Xu;Yong Du;R. Schmid-Fetzer;T. Zhou
中科院分区：
文献类型：
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作者：
Fan Zhang;Hong-hui Xu;Yong Du;R. Schmid-Fetzer;T. Zhou
用X射线衍射、扫描电镜和电子探针等方法，研究了Mg-La-Nd三元系在500 °C时的相平衡。准确测定了5个三相平衡。发现Mg-La二元体系中在500 °C下不稳定的Mg 2La相通过添加Nd而稳定。三元Mg_2La相的组成范围为0.10 ~ 12.6at.%，Nd在500 °C。Mg_（41）La_（5）相在Mg-La二元系中500 °C时不稳定，Nd的加入使其在500 °C时稳定。La在Mg_（41）Nd_（55）中的溶解度为7.4at.%路易斯安那州Nd在Mg_（17）La_2和Mg_（12）La中的溶解度分别为1.4at.% Nd和5.1原子% Nd，分别。在MgLa和MgNd之间形成连续固溶体Mg（La，Nd），在Mg3 La和Mg3 Nd之间形成连续固溶体Mg3（La，Nd）。在本工作中，在500 °C下的等温截面被构造。
The phase equilibria at 500 °C of the Mg–La–Nd system were investigated with four diffusion couples and 38 alloys, by means of X-ray diffraction technique, scanning electron microscopy and electron probe microanalyses. Five three-phase equilibria were accurately determined. The Mg2La phase, which is not stable at 500 °C in the Mg–La binary system, was found to be stabilized with the addition of Nd. The composition range of the ternary Mg2La phase was measured to be ∼0–12.6 at.% Nd at 500 °C. The Mg41La5phase, which is not stable at 500 °C in the Mg–La binary system, is stabilized at 500 °C with the addition of Nd. The solubility of La in Mg41Nd5was measured to be up to 7.4 at.% La. The solubility of Nd in Mg17La2and in Mg12La was determined to be 1.4 at.% Nd and 5.1 at.% Nd, respectively. The continuous solid solutions Mg(La, Nd) and Mg3(La, Nd) form between MgLa and MgNd and between Mg3La and Mg3Nd, respectively. The isothermal section at 500 °C was constructed in the present work.