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以Nd9Fe85.5-xCoxB5.5(x=0,1,3,5)合金快淬薄带(钼辊表面速度V=35 m/s)为原料采用热压/热变形工艺制各了各向同性磁体.微观组织研究表明,含Co合金快淬薄带由大量非晶和少量a-(Fe,Co)和Nd2(Fe,Co)14B相组成,含Co量达到5at%的合金薄带中出现了亚稳相Nd3(Fe,Co)62B14,它在随后的热压/热变形过程中分解为a-(Fe,Co)和Nd2(Fe,Co)14B:添加Co元素显著减小了热变形磁体的晶粒尺寸,软磁性相与硬磁性相的平均晶粒尺寸分别从无Co合金磁体的61,168nm减小为含1at%Co合金磁体的24,50 nm.磁性能研究表明,与晶粒尺寸变化相对应,无Co合金以晶间静磁耦合作用为主,含Co合金以晶间交换耦合作用为主,并且随着Co含量的升高,交换耦合作用有所减弱,导致热变形磁体的矫顽力从无Co磁体的151 kA/m单调增大为含5at%Co磁体的218 kA/m.

参考文献

[1] Liu J F;Davies H A .[J].Journal of Magnetism and Magnetic Materials,1996,157-158:29.
[2] Liu ZW;Davies HA .Influence of Co substitution for Fe on the magnetic properties of nanocrystalline (Nd,Pr)-Fe-B based alloys[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,2006(13):2647-2653.
[3] Zhang W Y;Yan A R;Zhang H W et al.[J].Journal of Alloys and Compounds,2001,315:174.
[4] 罗阳,刘世强.新一代磁体--大块完全致密(Nd,Pr,Dy)2Fe14B/α-Fe基纳米复合磁体[J].磁性材料及器件,2005(05):1-6,21.
[5] Buschow K H J.Supermagnet,Hard Magnetic Materials[M].Dordrecht:kluwer Academic Publishers,1991:553.
[6] Wang C;Yan M;Zhang WY .Significant changes in the microstructure, phase transformation and magnetic properties of (Nd,Pr)(2)Fe14B/alpha-Fe magnets induced by Nb and Zr additions[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2005(1):80-83.
[7] Chang WC.;Ma BM.;Bounds CO.;Yao SY.;Wu SH. .Magnetic properties enhancement of alpha-Fe/Nd2Fe14B-type nanocomposites by Co substitution[J].Journal of Applied Physics,1998(4):2147-2151.
[8] 潘树明.High Temperature Phase Transformation of Rare Earth Permanent-Magnet Alloys and Its Application(稀土永磁合金的高温相变及其应用)[M].北京:冶金工业出版社,2005:200.
[9] Cui B Z;O'Shea M J .[J].Journal of Magnetism and Magnetic Materials,2004,279:27.
[10] You CY.;Sun XK.;Liu W.;Cui BZ.;Zhao XG.;Geng DY.;Zhang ZD. .Effects of W and Co additions on the phase transformation and magnetic properties of nanocomposite Nd2Fe14B/alpha-Fe magnets[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,2002(10):943-950.
[11] 高汝伟,代由勇,陈伟,章亚明,张茂才,乔纬,王佐诚,李卫,李岫梅,王玉山,罗军,Luo Jun.纳米晶复合永磁材料的交换耦合相互作用和磁性能[J].物理学进展,2001(02):131-156.
[12] 贺淑莉,张宏伟,荣传兵,陈仁杰,孙继荣,沈保根.晶粒易轴取向度对纳米晶永磁Pr2Fe14B磁性的影响[J].物理学报,2005(07):3408-3413.
[13] Fukunaga H;Inoue H .[J].Journal of Applied Physics,1992,31:1347.
[14] 张宏伟,荣传兵,张健,张绍英,沈保根.纳米晶永磁Pr2Fe14B微磁学有限元法的模拟计算研究[J].物理学报,2003(03):718-721.
[15] 冯维存,高汝伟,韩广兵,朱明刚,李卫.NdFeB纳米复合永磁材料的交换耦合相互作用和有效各向异性[J].物理学报,2004(09):3171-3176.
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