Effect of microstructure on the coercivity of HDDR Nd-Fe-B permanent magnetic alloy
Effect of microstructure on the coercivity of HDDR Nd-Fe-B permanent magnetic alloy
复制标题
显微组织对HDDR Nd-Fe-B永磁合金矫顽力的影响
DOI：
10.1007/s11433-008-0159-6
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发表时间：
2008-08
期刊：
影响因子：
--
通讯作者：
Yang Wu
中科院分区：
文献类型：
--
作者：
Gao Ruwei;Sun Yan;Liu Min;Han GuangBing;Yang Wu
研究了HDDR Nd-Fe-B永磁合金晶界微结构对各向异性和矫顽力的影响。针对其磁粉颗粒的特殊微观结构，提出了同时考虑晶界结构缺陷和交换耦合作用的各向异性理论模型。计算了基于成核和钉扎机制的结构缺陷因子随2 r 0/lex（其中r 0和lex分别为缺陷厚度和交换耦合长度）的变化。结果表明，HDDR Nd-Fe-B永磁合金的矫顽力机制与晶界处的组织缺陷密切相关。对于一个固定的lex，当2 r 0/lex< 1.67时，矫顽力由钉扎机制控制，当2 r 0/lex> 1.67时，矫顽力由成核机制控制。当2 r 0/lex= 1.67时，电导率达到最大值。计算结果与Morimoto等人的实验结果吻合较好。
The effect of the grain boundary microstructure on the anisotropy and coercivity was investigated in an HDDR Nd-Fe-B permanent magnetic alloy. Considering the special microstructure of its magnetic powder grain, an anisotropic theoretical model influenced simultaneously by the structure defect at the grain boundary and the exchange coupling interaction was put forward. The variations of the structure defect factors based on the nucleation and pinning mechanism with 2r0/lex(wherer0andlexare the defect thickness and the length of exchange coupling, respectively) were calculated. The results show that the coercivity mechanism of an HDDR Nd-Fe-B permanent magnetic alloy is greatly related to its microstructure defect at the grain boundary. For a fixedlex, when 2r0/lex< 1.67, the coercivity is controlled by the pinning mechanism; when 2r0/lex> 1.67, it is determined by the nucleation mechanism. The coercivity reaches the maximum when 2r0/lex= 1.67. The calculation result is consistent well with the experimental result given by Morimoto et al.
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影响因子：
2.7
作者：
G. Ru-wei;L. Hua;Jiang Shou-Ting;Mei Liang-mo;Qiu Meiying
通讯作者：
G. Ru-wei;L. Hua;Jiang Shou-Ting;Mei Liang-mo;Qiu Meiying
影响因子：
2.7
作者：
KRONMULLER, H;DURST, KD;SAGAWA, M
通讯作者：
SAGAWA, M
影响因子：
2.7
作者：
Han, GB;Gao, RW;Li, XM
通讯作者：
Li, XM
影响因子：
2.7
作者：
R. Gao;Jie Zhang;Dan Zhang;You-yong Dai;X. Meng;Zhe-Ming Wang;Yong Zhang;H. Q. Liu
通讯作者：
R. Gao;Jie Zhang;Dan Zhang;You-yong Dai;X. Meng;Zhe-Ming Wang;Yong Zhang;H. Q. Liu
影响因子：
3.4
作者：
Kronmuller, H;Fischer, R;Zern, A
通讯作者：
Zern, A