Refinement of α-Fe and its improvement on magnetic properties of melt-spun nanocomposite Pr2Fe14B/α-Fe magnets by low wheel speed spinning

Nanostructured Materials Pub Date : 1999-11-01 DOI:10.1016/S0965-9773(99)00420-1

Z Chen , Y Zhang , G.C Hadjipanayis , Q Chen , B Ma

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引用次数: 2

Abstract

Nanocomposite Pr₂Fe₁₄B/α-Fe magnets with uniform microstructure and enhanced magnetic properties have been synthesized by melt-spinning a Pr₈Fe₈₆B₆ alloy at low wheel speed range. Microstructural and magnetic studies showed that there is an optimum wheel speed (about 16.7 m/s) at which a uniform Pr₂Fe₁₄B/α-Fe structure with fine α-Fe grains (about 10 nm) is developed directly from the melt. Lower speed gives larger grains for both the 2:14:1 and α-Fe, while higher speed leads to the appearance of an amorphous phase which will result in a Pr₂Fe₁₄B/α-Fe structure with larger α-Fe grains after a subsequent crystallization annealing. Magnetic properties obtained under the optimum-quenching followed by a subsequent annealing are M_s = 176.6 emu/g, M_r = 118.2 emu/g, M_r/M_s = 0.67, H_c = 5.4 kOe and (BH)_m = 12.6 MGOe. The coercivity and energy product are about 20% higher than those obtained by crystallization of over-quenched samples due to the refinement of α-Fe size which leads to an enhanced exchange coupling between Pr₂Fe₁₄B and α-Fe.

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α-Fe的细化及其对熔融纺纳米复合Pr2Fe14B/α-Fe磁体磁性能的改善

采用低轮速熔融纺丝法制备了组织均匀、磁性能增强的Pr2Fe14B/α-Fe纳米复合磁体。显微组织和磁学研究表明，在最佳轮速(约16.7 m/s)下，熔体直接形成均匀的Pr2Fe14B/α-Fe结构，α-Fe晶粒细(约10 nm)。较低的速度使2:14:1和α-Fe晶粒都变大，而较高的速度使非晶相出现，在后续的结晶退火后形成Pr2Fe14B/α-Fe结构，α-Fe晶粒变大。经最佳淬火和退火后的磁性能为Ms = 176.6 emu/g, Mr = 118.2 emu/g, Mr/Ms = 0.67, Hc = 5.4 kOe， (BH)m = 12.6 MGOe。由于α-Fe晶粒的细化，使得Pr2Fe14B与α-Fe之间的交换耦合增强，其矫顽力和能积比过淬火样品结晶时的矫顽力和能积提高了约20%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nanostructured Materials

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