Tuning the microstructure and magnetic properties of bulk nanocomposite magnets with large strain deformation
Tuning the microstructure and magnetic properties of bulk nanocomposite magnets with large strain deformation
复制标题
调整具有大应变变形的块状纳米复合磁体的微观结构和磁性能
DOI：
10.1016/j.jmmm.2016.10.126
复制
发表时间：
2017-03-01
影响因子：
2.7
通讯作者：
Zhang, Xiangyi
中科院分区：
文献类型：
--
作者：
Li, Hailing;Li, Wei;Zhang, Xiangyi
在这项研究中，我们研究了应变对α - fe / Nd2Fe14B纳米复合磁体的微观结构和磁性能的影响，这些磁体是由室温剧烈塑性变形和随后的热退火组合而成的。实验结果表明，在热处理过程中，剧烈的塑性变形可以诱导非晶基体中形成α - fe和Nd2Fe14B纳米晶，并抑制亚稳中间相的形成。随着应变的增加，磁体中α - fe相的体积分数增加，α - fe相和Nd2Fe14B相的晶粒尺寸显著减小。结果表明，与直接退火的部分非晶态(Nd-Pr)-Fe-Co-Nb-B、（BH）(max)= 12.2 MGOe、H-c= 6.2 kOe相比，在e= 6.2处制备的块体磁体的磁性能（BH）(max)= 17.8 MGOe、H-c= 7.2 kOe有所增强。
In this study, we investigated the effect of strain on the microstructure and magnetic properties of bulk alpha-Fe/ Nd2Fe14B nanocomposite magnets produced by a combination of severe plastic deformation at room temperature and subsequent thermal annealing. Experiment results indicate that severe plastic deformation can induce the formation of alpha-Fe and Nd2Fe14B nanocrystals in the amorphous matrix and then suppress the formation of metastable intermediate phases during thermal annealing. The volume fraction of alpha-Fe phase in the magnets increases as the strain increases, and the grain size of alpha-Fe and Nd2Fe14B phases significantly decreases. As a result, the bulk magnets made at e= 6.2 show enhanced magnetic properties, (BH)(max)= 17.8 MGOe and H-c= 7.2 kOe, compared with that of directly annealed partially amorphous (Nd-Pr)-Fe-Co-Nb-B, (BH)(max)= 12.2 MGOe and H-c= 6.2 kOe.