Tuning the microstructure and magnetic properties of bulk nanocomposite magnets with large strain deformation

被引：8
|
作者：
Li, Hailing [1 ]
Li, Wei [1 ]
Guo, Defeng [1 ]
Zhang, Xiangyi [1 ]
机构：
[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2017年 / 425卷
基金：
中国国家自然科学基金;
关键词：
Strain; Severe plastic deformation; Microstructure; Magnetic properties; Nanocomposite magnets; NUCLEATION; COERCIVITY;
D O I：
10.1016/j.jmmm.2016.10.126
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：84 / 89
页数：6
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