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首页> 外文期刊>Physica, B. Condensed Matter >Enhanced alignment and magnetic properties of die-upset nano-crystal Nd _2Fe _(14)B magnets with Nb addition
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Enhanced alignment and magnetic properties of die-upset nano-crystal Nd _2Fe _(14)B magnets with Nb addition

机译：掺Nb增强模锻纳米Nd _2Fe _（14）B磁体的取向和磁性

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摘要

It is difficult to obtain the crystallographic alignment for stoichiometric Nd _2Fe _(14)B alloys by applying the melt-spun and subsequent hot-pressing and hot-deformation techniques. However, the enhanced alignment and magnetic properties of die-upset nano-crystal Nd _2Fe _(14)B magnets have been obtained by Nb addition in the present paper. The magnetic properties studies show that Nb addition leads to the remarkable increase of remanence B _r and intrinsic coercivity H _(ci), which is due to the improvement of c-axis texture and refinement of microstructure. Microstructure studies using transmission electron microscopy (TEM) and X-ray diffraction (XRD) reveal that Nb atoms are enriched at grain boundary and the NbFeB phase is observed with increasing Nb content. Since some Fe atoms in the Nd _2Fe _(14)B phase participate in the formation of NbFeB phase, the excessive Nd atoms may be enriched at grain boundary, which may improve the physical property of grain boundary and provide a mass transport pass for preferential growth of oriented Nd _2Fe _(14)B grains, thus leading to the enhanced alignment and magnetic properties.
机译：通过应用熔融纺丝以及随后的热压和热变形技术，很难获得化学计量的Nd _2Fe _（14）B合金的晶体取向。然而，通过添加Nb，已经获得了模锻加厚纳米晶体Nd _2Fe _（14）B磁体的增强的取向和磁性能。磁性能研究表明，添加Nb会导致剩磁B _r和固有矫顽力H _（ci）显着增加，这是由于c轴织构的改善和显微组织的细化。使用透射电子显微镜（TEM）和X射线衍射（XRD）进行的微结构研究表明，Nb原子在晶界富集，并且随着Nb含量的增加而观察到NbFeB相。由于Nd _2Fe _（14）B相中的某些Fe原子参与了NbFeB相的形成，多余的Nd原子可能在晶界富集，这可以改善晶界的物理性质，并为优先提供质子传递通道。 Nd _2Fe _（14）B晶粒的取向生长，从而导致取向和磁性能增强。

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