添加镝的Nd-Fe-B纳米晶单相合金的微结构与磁性能研究  

Effect of Dysprosium Addition on Microstructure and Magnetic Properties of Nanocrystalline Nd-Fe-B Single Phase Alloy

作　　者：隋延力[1] 陈治安[2] 包小倩[1] 张茂才[1] 周寿增[1] 

机构地区：[1]北京科技大学新材料国家重点实验室,北京100083 [2]北京科技大学粉末冶金研究所,北京100083

出　　处：《中国稀土学报》2008年第5期647-651,共5页Journal of the Chinese Society of Rare Earths

摘　　要：采用单辊快淬法制备了Nd12.3-xDyxFe79.7Zr0.8Nb0.8Cu0.4B6.0(x=0,0.5,1.5,2.5)合金纳米晶单相永磁薄带,研究了合金薄带晶化处理后,成分、组织结构与磁性能之间的关系。X射线衍射分析(XRD)表明,淬态合金主要由非晶相和Nd2Fe14B相组成,完全晶化后由Nd2Fe14B相和少量-αFe组成。高分辨透射电镜(HRTEM)分析表明,经充分退火后,Nd2Fe14B晶体完整,晶粒间几乎没有边界相。随着Dy含量增加,晶粒尺寸细化,矫顽力大幅提高。x=0.5合金综合磁性能最佳,经过700℃晶化处理10 min后,其磁性能为Jr=1.09 T,Hci=1048kA.m-1,(BH)max=169.5 kJ.m-3。Effect of Dy addition on microstructure and magnetic properties of DyxFe79.TZr0.8Nb0.8Cu0. 4 B6.0 （x=0, 0.5, 1.5, 2.5）single phase alloy prepared by melt-spinning and subsequent annealing was systematically investigated. Xray diffraction analysis showed that the melt-spun ribbons composed of amorphous phase and Nd2Fe14B were directly crystallized to Nd2Fe14B phase and slight α-Fe after annealing treatment. High resolution transmissionelectron microscope observation indicated that there existed only Nd2Fe14 B grains without defects and boundary phase in the ribbons optimally annealed. With increasing Dy content, the grain sizes were finer and the coercivities increased. The optimum magnetic properties with Jr = 1.09 T, Hci = 1048 kA·m^-1, （BH）m = 169.5 kJ· m^-3 were obtained by annealing the meh-spun Nd11. 8 Dy0.5 Fe79.7Zr0 .8 Nb0.8 Cu0.4 B6.0 ribbon at 700 ℃ for 10 min.

关 键 词：Nd-Fe-B单相纳米晶 显微组织 磁性能 稀土 

分 类 号：TM273[一般工业技术—材料科学与工程]