Effect of multiple alloying elements (Ga, Nb, Zr, Hf and Pr) on microstructure and magnetic properties of nanocomposite Nd 9- x Pr x Fe 86.5- y-z-m-n Ga y Nb z Zr m Hf n B 4.5 ( ...Effect of multiple alloying elements (Ga, Nb, Zr, Hf and Pr) on microstructure and magnetic properties of nanocomposite Nd 9- x Pr x Fe 86.5- y-z-m-n Ga y Nb z Zr m Hf n B 4.5 ( x =0, 2 25; y, z, m, n =0.5, 1.0) ribbons was investigated by a L 16 (2 15 ) orthogonal experiment. The results show that the addition of multiple alloying elements can effectively reduce the grain size of Nd 2Fe 14 B and α Fe phases and promote amorphous phase to occur at low wheel speed. No inhomogeneous growth of grains was found in annealed ribbons, but a large amount of additives would results in irregularity of Nd 2Fe 14 B and α Fe grains. On the other hand, addition of multiple alloying elements has complex effects on magnetic properties due to interactions between alloying elements. When the content of Nb is 0.5%, increasing the content of Pr and Ga and decreasing the content of Zr and Hf can improve the magnetic properties effectively. The optimum magnetic properties were obtained in Nd 2.25 Pr 6.75 Fe 84.5 Ga 1.5 Nb 0.5 B 4.5 ribbons spun at 15 m·s -1 with J r=1.053 T, i H c=530.9 kA·m -1 ,( BH ) max =124 kJ·m -3 .展开更多
研究了微量合金元素 Nb 的添加对 Fe3B/Nd2Fe14B型纳米复合永磁体微观结构与磁性能的影响规律。结果表明,添加Nb元素可以稳定非晶相,阻碍Fe3B粒子的结晶动力学。Nd5.5Fe70.0Co5Cu0.5Nb0.5B18.5非晶合金在640℃退火处理 30min可获得最佳...研究了微量合金元素 Nb 的添加对 Fe3B/Nd2Fe14B型纳米复合永磁体微观结构与磁性能的影响规律。结果表明,添加Nb元素可以稳定非晶相,阻碍Fe3B粒子的结晶动力学。Nd5.5Fe70.0Co5Cu0.5Nb0.5B18.5非晶合金在640℃退火处理 30min可获得最佳磁性能:Br=1.05T,jHc=367kA/m,(BH)max=80.2kJ/m3。Nb与Cu的复合添加对Fe3B晶粒的细化效果更显著;Nb元素的添加可以提高合金的磁性能,但添加量必须适中。展开更多
文摘Effect of multiple alloying elements (Ga, Nb, Zr, Hf and Pr) on microstructure and magnetic properties of nanocomposite Nd 9- x Pr x Fe 86.5- y-z-m-n Ga y Nb z Zr m Hf n B 4.5 ( x =0, 2 25; y, z, m, n =0.5, 1.0) ribbons was investigated by a L 16 (2 15 ) orthogonal experiment. The results show that the addition of multiple alloying elements can effectively reduce the grain size of Nd 2Fe 14 B and α Fe phases and promote amorphous phase to occur at low wheel speed. No inhomogeneous growth of grains was found in annealed ribbons, but a large amount of additives would results in irregularity of Nd 2Fe 14 B and α Fe grains. On the other hand, addition of multiple alloying elements has complex effects on magnetic properties due to interactions between alloying elements. When the content of Nb is 0.5%, increasing the content of Pr and Ga and decreasing the content of Zr and Hf can improve the magnetic properties effectively. The optimum magnetic properties were obtained in Nd 2.25 Pr 6.75 Fe 84.5 Ga 1.5 Nb 0.5 B 4.5 ribbons spun at 15 m·s -1 with J r=1.053 T, i H c=530.9 kA·m -1 ,( BH ) max =124 kJ·m -3 .
文摘研究了微量合金元素 Nb 的添加对 Fe3B/Nd2Fe14B型纳米复合永磁体微观结构与磁性能的影响规律。结果表明,添加Nb元素可以稳定非晶相,阻碍Fe3B粒子的结晶动力学。Nd5.5Fe70.0Co5Cu0.5Nb0.5B18.5非晶合金在640℃退火处理 30min可获得最佳磁性能:Br=1.05T,jHc=367kA/m,(BH)max=80.2kJ/m3。Nb与Cu的复合添加对Fe3B晶粒的细化效果更显著;Nb元素的添加可以提高合金的磁性能,但添加量必须适中。
