Microstructure evolution and coercivity enhancement in Pr50Dy20Cu15Ga15-doped hot-deformed Nd-Fe-B magnets
Microstructure evolution and coercivity enhancement in Pr50Dy20Cu15Ga15-doped hot-deformed Nd-Fe-B magnets
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DOI：
10.1016/j.jmmm.2020.166637
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发表时间：
2020-06-01
影响因子：
2.7
通讯作者：
Zhong, Zhenchen
中科院分区：
文献类型：
--
作者：
Huang, Xiangyun;Li, Jiajie;Zhong, Zhenchen
为了提高Nd-Fe-B热变形磁体的矫顽力（H-cj）和热稳定性，引入了含有少量重稀土（HRE）的Pr50Dy20Cu15Ga15 （a .%）合金粉末。研究了添加不同量Pr50Dy20Cu15Ga15合金粉末的HD磁体的磁性能、热稳定性和显微组织。通过添加3 wt.%的Pr50Dy20Cu15Ga15合金粉末，使HD磁体的H-ej从1242 kA/m提高到1595 kA/m。在高温下，掺杂HD磁体的热稳定性也得到了改善。富稀土（RE-rich）相对Nd2Fe14B晶粒较好的隔离作用和局部高各向异性（Nd, Pr, Dy）(2)Fe14B硬磁相的形成是H-ej增大的主要原因。值得注意的是，富re相的不均匀聚集导致磁各向异性的不均匀性，最终导致反冲回路的大开度。本研究直观地揭示了HD磁体的微观结构演变与磁性能之间的关系。
To improve the coercivity (H-cj) and thermal stability of hot-deformed (HD) Nd-Fe-B magnets, Pr50Dy20Cu15Ga15 (at.%) alloy powders with minor heavy rare earth (HRE) are introduced. The magnetic properties, thermal stability and microstructure of the HD magnets with different amounts of Pr50Dy20Cu15Ga15 alloy powders are investigated. The H-ej, of the HD magnets is enhanced from 1242 kA/m to 1595 kA/m by doping 3 wt.% Pr50Dy20Cu15Ga15 alloy powders. The thermal stability of the doped HD magnet is also improved at high temperatures. The better isolation of Nd2Fe14B grains by rare earth-rich (RE-rich) phases and the formation of local high-anisotropy (Nd, Pr, Dy)(2)Fe14B hard magnetic phases are the main reasons for the increase of H-ej. Notably, the non-uniform aggregation of RE-rich phases results in the inhomogeneity of magnetic anisotropy, which eventually leads to the large openness of the recoil loops. This study gives an intuitive view on the relationship between microstructure evolution and magnetic properties of the HD magnets.