La-Ni-Cr三元系600℃等温截面的相关系

The 873 K Isothermal Section of La-Ni-Cr Ternary System Phase Diagram

摘要:

用X射线粉末衍射法，差热分析法和金相分析法测定了La-Ni-Cr三元系600℃等温截面的相关系。结果表明：此截面由10个单相区、17个两相区和8个三相区组成。在本实验条件下未发现新的三元化合物，没有观察到化合物Cr，Ni3和Cr3Ni2的谱线；化合物La3Ni的谱线是由La和La7Ni3的谱线相叠加；没有观察到LaNi2，而观察到La7Ni16的存在。Ni在Cr中的最大固溶度大约为3at％，Cr在Ni，LaNi5，La2Ni7，LaNi3，La2Ni3，LaNi和La7Ni3中的最大固溶度(at%)分别约为35，20，15，8，9，9和6，Cr在La7Ni16中的固溶度几乎为零。

Abstract:

The 873 K isothermal section of La-Ni-Cr ternary system phase diagram was investigated by X-ray powder diffraction, differential thermal analysis and electron microscopy techniques. It is composed of 10 single-phase regions, 17 two-phase regions and 8 three-phase regions. At 873 K, the existence of ternary compounds has not observed in the isothermal section. The maximum solid solubility of Ni in Cr is about 3 at%Ni, and that of Cr in Ni, LaNi5, La2Ni7, LaNi3, La2Ni3, LaNi, La7Ni3 is about 35, 20, 15, 8, 9, 9 and 6 at% Cr, respectively. The solid solubility of Cr in the La7Ni16 phase is nearly zero.