合金元素在Nd2Fe14B/α-Fe纳米复合永磁材料中的分布  

Elemental distribution of Nb and Zr atoms in Nd2Fe14B/α-Fe nanocomposite magnets

作　　者：王占勇[1] 刘文庆[2] 周邦新[3] 倪建森[3] 徐晖[3] 

机构地区：[1]上海应用技术学院材料工程系,上海200235 [2]上海大学分析测试中心,上海200046 [3]上海大学材料所,上海200072

出　　处：《功能材料》2007年第A03期981-983,共3页Journal of Functional Materials

基　　金：上海应用技术学院引进人才启动基金资助项目（YJ2006-16）;上海市重点学科建设资助项目（P1502）;上海市科委纳米专项资助项目（0552nm049）;国家高技术研究发展计划（863计划）资助项目（2002AA302602-2）.

摘　　要：主要利用三维原子探针研究了Nb和Zr等元素在Nd2Fe14B/α-Fe纳米复合永磁材料中的分布情况。研究发现，Nb、Zr等元素的添加改善了合金的微观结构，使得合金晶化后晶粒细小均匀，晶粒形状更为规则，合金的综合磁性能得到提高。三维原子探针分析结果表明，Nb元素不固溶于Nd2Fe14B硬磁性相，主要以NbFeB的形式在晶界处析出；Zr元素在Nd2Fe14B相内有较高的固溶度，与Nb、Fe在晶界处以成份接近（Zr，Nb）Fe2相的形式析出，富Nb相和富Zr相在晶界的析出阻碍了晶粒的长大，进而细化了晶粒，改善了磁性能。Elemental distribution of Nb and Zr atoms in Nd2Fe14B/α-Fe nanocomposite magnets were investigated by three-dimensional atom probe（3DAP）. With the addition of Nb and Zr elements, a microstructure with fine, homogenous and regular grains could be obtained, and higher magnetic properties were achieved. The results of 3DAP reveal that, ① Nb atoms almost have no solution in Nd2Fe14B phase, and precipitate at the grains boundary with Fe and B atoms; ②Zr atoms have higher solution in Nd2FeI4B phase, and form a phase with composition near （Zr,Nb）Fe2 phase at the grains boundary with combining Fe and Nb atoms. The formation of bib-enriched and Zr-enriched phases hinders the grain growth, refines the microstructure and modifies the magnetic properties.

关 键 词：三维原子探针 ND2FE14B/Α-FE 元素分布 永磁材料 

分 类 号：TM273[一般工业技术—材料科学与工程]