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扩散偶法测定La-Nd-Fe三元系873 K等温截面 被引量：2

Determination of Isothermal Section of La-Nd-Fe Ternary System at 873 K by Diffusion Triple Method
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摘要 La-Nd-Fe三元相图对与La相关的稀土永磁材料的研发设计具有重要意义。探索了含有La和Nd的双稀土三元扩散偶的制备工艺,并成功制备出La-Nd-Fe三元扩散偶样品。根据局域平衡原理,采用电子探针微区元素分析(EPMA)技术测定了La-Nd-Fe三元系873 K等温截面相图,其由7个单相区、11个两相区以及5个三相区组成。实验中发现了LaFe2和NdFe2相的存在,没有发现三元化合物。另外,本实验准确测定了各相的固溶度:La在Nd中的固溶度为48.62%(原子分数),Nd在La中的固溶度为38.77%,Nd在LaFe2中的固溶度是12.73%,La在NdFe2,Nd2Fe17,Nd5Fe17中的固溶度分别是10.48%,1.54%及3.29%。 La-Nd-Fe ternary phase diagram is of great significance for the research,development and design of La-related rare earth permanent magnet materials.In the present work,the preparation process of a double rare earth ternary diffusion junction containing La and Nd was explored and the La-Nd-Fe ternary diffusion junction was prepared successfully.According to the local phase equilibrium principle,the isothermal section of La-Nd-Fe ternary system at 873 K was experimentally determined by the electron probe microanalysis(EPMA).The isothermal section consists of 7 single-phase,11 two-phase and 5 three-phase regions.The existence of LaFe2 and NdFe2 phases was observed in the experiments.There was no ternary compound observed.In addition,the solubility of the phases in this system was accurately determined:the maximum solubility of La in Nd is 48.62%(atom fraction),the maximum solubility of Nd in La is 38.77%,the maximum solubility of Nd in LaFe2 is 12.73%,and the maximum solubility of La in NdFe2,Nd2Fe17 and Nd5Fe17 is 10.48%,1.54%and 3.29%,respectively.
作者 张奇 姚青荣 龙乾新 周怀营 王江 饶光辉 Zhang Qi;Yao Qingrong;Long Qianxin;Zhou Huaiying;Wang Jiang;Rao Guanghui(Guangxi Key Ldboratory of Information Materials,School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China)
机构地区 桂林电子科技大学材料科学与工程学院
出处 《中国稀土学报》 CAS CSCD 北大核心 2020年第6期781-787,共7页 Journal of the Chinese Society of Rare Earths
基金 国家重点研发计划项目(SQ2016YFGX090104)资助。
关键词 La-Nd-Fe 扩散偶 等温截面 NdFe2 LaFe2 La-Nd-Fe diffusion triple isothermal section NdFe2 LaFe2
分类号 O614.33 [理学—无机化学] TG146.4 [金属学及工艺—金属材料]
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中国稀土学报
2020年 第6期

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