Reducing Dy content by Ce substitution in nanocomposite Nd-Dy-Fe-B/α-Fe alloys
Reducing Dy content by Ce substitution in nanocomposite Nd-Dy-Fe-B/α-Fe alloys
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DOI：
10.1016/j.jallcom.2018.07.057
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发表时间：
2018-10
影响因子：
6.2
通讯作者：
J. Zhang;M. Zhong;L. Zhao;X. Liao;H. Zeng;X. Zhong;Huangzhong Yu;Z. Zhong;Zuolian Liu
中科院分区：
文献类型：
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作者：
J. Zhang;M. Zhong;L. Zhao;X. Liao;H. Zeng;X. Zhong;Huangzhong Yu;Z. Zhong;Zuolian Liu
为了缓解Dy和Tb的短缺并开发高性能/成本比的永磁体，人们建议在Nd-Fe-B合金中使用丰富且廉价的稀土（RE）元素Ce。本工作系统研究了Ce替代Dy对熔纺纳米复合材料[Nd0.8(Dy1-xCex)0.2]10Fe82.5B6Zr1.5合金微观结构、磁性能和热稳定性的影响。精修的 XRD 结果表明，所有合金中均存在 2:14:1 相和 α-Fe，并且在 x=0.2 的合金中观察到 2:14:1 相的 c 轴膨胀。通过 Ce 替代，合金的晶粒尺寸略有增加，微观结构更加均匀。矫顽力异常增大Hc=833kA/m，矫顽力温度系数|β|突然减小 在x=0.8合金中观察到=0.323%/°C，仅略低于x=0.25合金的865kA/m和0.321%/°C。随着Ce含量的增加，2:14:1相的居里温度Tco从550K单调下降至535K，交换耦合效应减弱。 Dy 还原量为 50% 的 [Nd0.8(Dy0.5Ce0.5)0.2]10Fe82.5B6Zr1.5 合金表现出 133kJ/m3 的高 (BH)max，可接受的 β 值为 -0.348%/°C，Hco 为 769kA/m。预计这些研究可能有利于开发含 Ce 纳米晶 Nd-Fe-B 磁体，并节省重稀土资源。
To alleviate Dy and Tb shortage and develop permanent magnets with high performance/cost ratio, the abundant and inexpensive rare earth (RE) element Ce has been suggested to be employed in Nd-Fe-B alloys. In this work, the effects of Ce substitution for Dy on the microstructure, magnetic properties, and thermal stability of melt spun nanocomposite [Nd0.8(Dy1-xCex)0.2]10Fe82.5B6Zr1.5alloys are systematically investigated. The refined XRD results show the existence of 2:14:1 phase and α-Fe in all alloys, and the c-axis expansion for the 2:14:1 phase is observed in the alloy with x = 0.2. With Ce substitution, the alloys exhibit a lightly increased grain size and more uniform microstructure. An abnormal increase of coercivityHc= 833 kA/m and a sudden decrease of temperature coefficients of coercivity |β| = 0.323%/°C are observed in x = 0.8 alloy, which is only slightly lower than those of x = 0.25 alloy, 865 kA/m and 0.321%/°C, respectively. With increasing Ce content, the Curie temperatureTcof 2:14:1 phase monotonically decreases from 550 K to 535 K, and the exchange coupling effect is weakened. The [Nd0.8(Dy0.5Ce0.5)0.2]10Fe82.5B6Zr1.5alloy with 50% Dy reduction exhibits a high (BH)maxof 133 kJ/m3with an acceptableβvalue of −0.348%/°C and anHcof 769 kA/m. It is expected that these investigations could be beneficial for developing Ce-containing nanocrystalline Nd-Fe-B magnets with saved heavy RE resources.