The orientation dependence of grain boundary diffusion process of a sintered Nd-Fe-B magnet under pressure
The orientation dependence of grain boundary diffusion process of a sintered Nd-Fe-B magnet under pressure
复制标题
压力下烧结Nd-Fe-B磁体晶界扩散过程的取向依赖性
DOI：
10.1016/j.jmmm.2021.167947
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发表时间：
2021-07
影响因子：
2.7
通讯作者：
Wenqiang Zhao
中科院分区：
文献类型：
--
作者：
Fugang Chen;Yong Zhao;Xiaoli Wang;Caiping Jiang;Jinlu Chen;Wenqiang Zhao
研究了烧结NdFeB磁体的晶界扩散过程(GBDP)与取向和压力的关系。在750℃时，平行于取向方向(c轴)的40 Mpa单轴压力下的GBDP比垂直于c轴的GBDP能更有效地提高矫直力。在750℃、50 Mpa的单轴压力下，经GBDP处理后的磁体表面出现了明显的宏观裂纹，相应的矫顽力和退磁曲线的正方形因子大大降低。Nd2Fe14B主相弹性应变能的各向异性和富Nd相在晶界的各向异性分析了Nd2Fe14B主相弹性应变能的各向异性和晶界富Nd相的各向异性，在750℃下，当加载压力为50 Mpa时，Nd2Fe14B磁体完全破碎。
The dependence of the grain boundary diffusion process (GBDP) on the orientation and pressure of a sintered Nd-Fe-B magnet was studied. At 750 °C the GBDP under an uniaxial pressure of 40 MPa parallel to the alignment direction (c-axis) is much more effective to enhance the coercivity than that performed perpendicular to thec-axis. Obvious macroscopic cracks appeared on the surface of the magnet after GBDP under an uniaxial pressure of 50 MPa along thec-axis at 750 °C, and the corresponding coercivity and the squareness factor of demagnetization curve decreased greatly. The Nd-Fe-B magnet was crushed totally when loaded under an uniaxial pressure of 50 MPa perpendicular to thec-axis at 750 °C. The mechanism was discussed based on the anisotropy of the elastic strain energy of the Nd2Fe14B main phase and the anisotropy distribution of the grain boundary Nd-rich phases.
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