| Nd含量对纳米晶Nd_xFe_(94-x)B_6合金磁性能的影响 |
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| 引用本文： | 包小倩,高学绪,朱洁,张茂才,周寿增.Nd含量对纳米晶Nd_xFe_(94-x)B_6合金磁性能的影响[J].金属学报,2009,45(8). |
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| 作者姓名： | 包小倩 高学绪 朱洁 张茂才 周寿增 |
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| 作者单位： | 北京科技大学新金属材料国家重点实验室,北京,100083 |
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| 摘 要： | 用X射线衍射(XRD)、差示扫描量热分析(DSC)、高分辨扫描电镜(HRSEM)和振动样品磁强计(VSM)等研究了Nd含量对快淬纳米晶NdxFe94-xB6(x=11.0-16.8)合金的组织结构、磁性能、交换耦合作用和矫顽力的影响.结果表明,22 m/s(甩带速度)快淬带在最佳退火条件下,合金带的内禀矫顽力Hci由x=11.0的601.. kA/m单调升高到x=16.8的1277.3 kA/m;相反,剩余磁极化强度Jr由x=11.0的1.047 T单调下降到x=16.8的0.721 T,最大磁能积(BH)max随Nd含量增加先升高后下降Nd11.8Fe82.2B6金带的综合性能最好:Jr=0.992 T,Hci=727.9 kA/m,(BH)max=137.2 kJ/m3.Nd2Fe14B晶粒之间的交换耦合作用随Nd含量增加而降低,但x=16.8的合金带仍具有较强的交换耦合作用.矫顽力主要由钉扎场决定.最佳退火后,合金薄带的晶粒尺寸随Nd含量增加无明显变化.针对不同Nd含量的合金,建立了一个组织模型,利用该模型很好地解释了Nd含量对磁性能及交换耦合作用的影响机制.
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| 关 键 词： | 纳米晶Nd-Fe-B 交换耦合作用 矫顽力机制 显微组织 |
EFFECTS OF Nd CONTENT ON MAGNETIC PROPERTIES OF NANOCRYSTALLINE Nd_xFe_(94-x)B_6 ALLOYS |
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| BAO Xiaoqian,GAO Xuexu,ZHU lie,ZHANG Maocai,ZHOU Shouzeng.EFFECTS OF Nd CONTENT ON MAGNETIC PROPERTIES OF NANOCRYSTALLINE Nd_xFe_(94-x)B_6 ALLOYS[J].Acta Metallurgica Sinica,2009,45(8). |
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| Authors: | BAO Xiaoqian GAO Xuexu ZHU lie ZHANG Maocai ZHOU Shouzeng |
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| Affiliation: | BAO Xiaoqian,GAO Xuexu,ZHU Jie,ZHANG Maocai,ZHOU Shouzeng State Key Laboratory for Advanced Metals , Materials,University of Science , Technology Beijing,Beijing 100083 |
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| Abstract: | Nanocomposite magnets have attracted considerable attention as a probable new generation of permanent magnets with a potential theoretical maximum energy product of 1 MJ/m~3 due to remanence enhancement resulting from intergrain exchange interactions between magnetically soft and hard grains.However,the presence of soft phase increases remanence but coercive field is significantly decreased.Alloys with Nd content higher than 11%(atom fraction),i.e..close to the stoichiometry composition of Nd_2Fe_(14)B,are ... |
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| Keywords: | nanocrystalline Nd-Fe-B exchange coupling coercivity mechanism microstructure |
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