矫顽力
材料科学
原子探针
磁晶各向异性
磁铁
微观结构
晶界
扫描电子显微镜
相(物质)
透射电子显微镜
分析化学(期刊)
冶金
磁各向异性
复合材料
磁化
凝聚态物理
磁场
纳米技术
物理
量子力学
有机化学
化学
色谱法
作者
W.F. Li,H. Sepehri‐Amin,T. Ohkubo,N. Hase,K. Hono
出处
期刊:Acta Materialia
[Elsevier]
日期:2011-03-05
卷期号:59 (8): 3061-3069
被引量:143
标识
DOI:10.1016/j.actamat.2011.01.046
摘要
The enhanced coercivity of Dy-substituted Nd–Fe–B-based sintered magnets is generally believed to be due to the enhanced magnetocrystalline anisotropy of the compound (Nd,Dy)2Fe14B. In this work we have analyzed the distribution of Dy in sintered (Nd,Dy)–Fe–B magnets using the three-dimensional atom probe (3DAP) technique complemented with high-resolution scanning and transmission electron microscopy. We found Dy atoms are not uniformly distributed throughout the microstructure but some Dy oxides are present. 3DAP results revealed that a nearly pure Nd layer of about 6 nm is present at some of the interfaces between the (Nd,Dy)-rich phase and the (Nd,Dy)2Fe14B phase. Like other optimally annealed sintered magnets, a thin Nd- and Cu-enriched layer was found throughout grain boundaries, in which Dy was not enriched compared with the surrounding area. Based on these newly found microstructural features, the coercivity of (Nd,Dy)–Fe–B sintered magnets is discussed.
科研通智能强力驱动
Strongly Powered by AbleSci AI