【作者】 王占勇； 刘文庆； 周邦新； 倪建森； 徐晖；

【Author】 WANG Zhan-yong~1 LIU Wen-qing~2 ZHOU Bang-xin~3 NI Jian-sen~3 XUHui~3(1.Deparment of Materials Engineering,Shanghai Institute of Technology,Shanghai 200235,China;2.Instrumental Analysis and Research Center,Shanghai University,Shanghai 200046,China;3.Institute of Materials,Shanghai University,Shanghai 200072,China)

【机构】 上海应用技术学院材料工程系； 上海大学分析测试中心； 上海大学材料所；

【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．更多还原

【Abstract】 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 Nd₂Fe₁₄B 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 Nb-enriched and Zr-enriched phases hinders the grain growth,refines the microstructure and modifies the magnetic properties.更多还原