Nb在单相Nd2Fe14B纳米晶合金晶化过程中的作用

The Roles of Nb in Crystallization Procedure of Nano-Crystal Nd2Fe14B Permanent Magnet

摘要:

利用X射线衍射、透射电镜和三维原子探针(three-dimensional atom probe, 简称3DAP )等研究Nb在单相Nd2Fe14B纳米晶永磁合金的作用机制。结果表明，Nb的添加提高了合金的非晶形成能力和非晶的热稳定性，使得合金最佳晶化温度升高。三维原子探针分析表明，Nb一方面分布在非晶基体中，另一方面在淬态薄带中存在不同程度的偏聚，这些Nb富集区中存在大量B元素，稀土含量很少，甚至不存在，含有部分Fe元素。Nb富集区的存在阻碍新生Nd2Fe14B相的长大，使晶化后的组织细小且均匀，提高了

Abstract:

The roles of Nb played in crystallization procedure of nano-crystal Nd2Fe14B permanent magnet were investigated by XRD, TEM and 3DAP. The results revealed that the addition of Nb improved the glass formation ability of the alloys and the thermal stability of the as-spun amorphous ribbons, as well as improving the optimum crystallization temperature. Nb atoms, together with more B atoms and some Fe atoms, had some enrichment in the as-spun ribbons, but few or no Nd atoms were found at these Nb-enriched regions. Nb-enriched phase hindered the growth of Nd2Fe14B grains, refined the microstructure and improved the magnetic properties