Coercivity enhancement in HDDR near-stoichiometric ternary Nd–Fe–B powders

Coercivity enhancement in HDDR near-stoichiometric ternary Nd–Fe–B powders
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HDDR 近化学计量三元 Nd-Fe-B 粉末矫顽力增强

DOI:
10.1016/j.jmmm.2014.02.007
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发表时间:
2014-06
影响因子:
2.7
通讯作者:
Renbo Song
Renbo Song
中科院分区:
材料科学3区
文献类型:
--
作者:
Yingchang Yang;Aizhi Sun;Fuqiang Yang;Renbo Song

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制备了各向异性 HDDR 近化学计量三元 Nd-Fe-B 粉末。通过随后使用 Pr-Cu 合金的扩散处理,粉末的矫顽力从 208.6 kA/m 提高到 980.1 kA/m。作为对比,在原Nd-Fe-B合金中直接添加Pr和Cu元素的Nd11.5Fe80.7B6.1Pr1.2Cu0.5合金也采用相同的HDDR工艺处理,其矫顽力仅为557.3 kA/m。微观结构研究表明,HDDR Nd11.5Fe80.7B6.1Pr1.2Cu0.5粉末中大面积富(Nd,Pr)相集中在三角形区域,而富(Nd,Pr)相均匀分布在扩散处理粉末中。均匀的晶界层可以更有效地钉扎磁畴壁的运动,从而使扩散处理的 HDDR Nd-Fe-B 粉末具有更高的矫顽力。
Anisotropic HDDR near-stoichiometric ternary Nd–Fe–B powders have been prepared. The coercivity of the powders was improved from 208.6 to 980.1 kA/m by the subsequent diffusion treatment using the Pr–Cu alloy. For comparison, Nd11.5Fe80.7B6.1Pr1.2Cu0.5alloy, in which Pr and Cu elements were directly added into the original Nd–Fe–B alloy, was also treated by the same HDDR process and the coercivity was only 557.3 kA/m. Microstructural investigations showed that a large area of (Nd, Pr)-rich phases concentrated at triangle regions in the HDDR Nd11.5Fe80.7B6.1Pr1.2Cu0.5powders, while the (Nd, Pr)-rich phases distributed uniformly in the diffusion treated powders. The uniform grain boundary layer can pin the motion of domain wall more effectively, resulting in a higher coercivity in diffusion treated HDDR Nd–Fe–B powders.
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