Effect of Cu doping and annealing treatment on the microstructure and magnetic properties of nanocrystalline single-phase Nd-Fe-B alloys

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI:10.1016/S1005-8850(08)60282-0

Xiaoqian Bao, Xuexu Gao, Maocai Zhang, Yi Qiao, Xiaoyan Guo, Jie Zhu, Shouzeng Zhou

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Abstract

The effects of Cu addition and annealing treatment on the magnetic properties and microstructure of Nd_12.3Fe_81.7–xCu_xB₆ (x=0–1.2) ribbons melt-spun and annealed were systematically investigated by the methods of vibrating sample magnetometer (VSM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Optimum magnetic properties were achieved by annealing melt-spun Nd_12.3Fe_81.5Cu_0.2B₆ ribbons at 550°C for 15 min, which only contained Nd₂Fe₁₄B phase. The remanence, coercive force, and maximum energy product increase by 18.4%, 36.2%, and 49% respectively compared with those of Cu-free samples. The significant improvement in magnetic properties originates from the finer grains of the samples by introducing Cu, which leads to the stronger exchange-coupling between neighboring grains.

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Cu掺杂和退火处理对纳米晶单相Nd-Fe-B合金组织和磁性能的影响

采用振动样品磁强计(VSM)、x射线衍射(XRD)和透射电子显微镜(TEM)等方法，系统研究了Cu添加和退火处理对Nd12.3Fe81.7-xCuxB6 (x= 0-1.2)带熔体纺丝和退火后磁性能和微观结构的影响。熔体纺Nd12.3Fe81.5Cu0.2B6条带仅含Nd2Fe14B相，550℃退火15 min后磁性能达到最佳。剩余力、矫顽力和最大能积分别比不含cu的样品提高18.4%、36.2%和49%。Cu的引入使样品的晶粒变得更细，从而增强了相邻晶粒之间的交换耦合，从而显著改善了样品的磁性能。

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Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

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