【作者】 马峰全；

【导师】 刘敬旗；

【作者基本信息】 广西大学 ， 材料物理与化学， 2004， 硕士

【摘要】 本文主要采用X射线粉末衍射法，同时结合差热分析等方法对La-Ni-Cu三元系合金相图673K等温截面进行了研究。结果表明：该等温截面由13个单相区，23个两相区和11个三相区组成。 在673K下，Cu在La₂Ni₇，LaNi₃，La₇Ni₁₆，La₂Ni₃和LaNi中的最大固溶度分别约为2，2，3，3和5at．％；Ni在LaCu₂和LaCu中的最大固溶度分别约为15at％和4at％；Cu和Ni可以无限固溶，LaCu₅和LaNi₅也是无限固溶，它们分别形成连续固溶体；Cu在La₇Ni₃以及Ni在LaCu₆在中的固溶度很小，在本实验条件下未能观察到。 本系统发现一个新相La₁₀Cu₈₅Ni₅，它属于面心立方晶系，点阵常数a=1.158nm。更多还原

【Abstract】 The isothermal section of the phase diagram of the ternary system La-Ni-Cu has been investigated by X-ray diffraction, differential thermal analysis, optical microscopy and electron microscopy techniques. It consists of 13 single-phase regions, 23 two-phase regions and 11 three-phase regions. At 673 K, the maximum solid solubility of Cu in La2Ni7, LaNi3, La7Ni16, La2Ni3 and LaNi is about 2,2, 3, 3 and 5at.%Cu, respectively. The solid solubility of Cu in La7Ni3 and Ni in LaCu6 is too small to observe. Cu and Ni can replace each other in LaNis and LaCu5, the LaNis and LaCu5 form a continuous solid solution; Cu and Ni form a continuous solid solution too. The maximum solid solubility of Ni in LaCu2 and LaCu is about 15 and 4at%Ni, respectively. A new ternary compound La10Cu85Ni5 has been observed in the La-Ni-Cu ternary system. It belongs to a face-centered cubic lattice. Its lattice constant a is about equal to 1.158nm.更多还原