Phase Equilibria of the Nd-Fe-B Ternary System

Phase Equilibria of the Nd-Fe-B Ternary System
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Nd-Fe-B三元系的相平衡

DOI:
10.1007/s11669-016-0458-y
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发表时间:
2016-03
影响因子:
1.4
通讯作者:
Zhou H. Y.
Zhou H. Y.
中科院分区:
材料科学4区
文献类型:
--
作者:
Fu G.;Wang J.;Rong M. H.;Rao G. H.;Zhou H. Y.

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Nd-Fe-B基合金作为烧结Nd_2Fe_(14)B型永磁体,由于其优异的磁性能而得到广泛的研究。本文首先对文献中Nd-Fe-B三元系相平衡的实验资料进行了综述。采用X射线衍射技术和扫描电子显微镜(SEM)结合能谱仪(EDS)对873和1073 K退火的Nd-Fe-B合金进行了相平衡研究。在873和1073 K下,确定了三元金属间化合物:空间群为P42/mnm的Nd 2Fe 14 B为Nd 2Fe 14 B结构类型,空间群为Pccn的NdFe 4 B4为RE1.11Fe4B4结构类型,空间群为Rm的Nd 5 Fe 2B 6为Pr 5Co 2B 6结构类型。二元金属间化合物Nd 5 Fe 17在873 K下稳定存在,而在1073 K下没有发现。Nd-Fe-B三元系在873 K时的相平衡由14个单相区、28个两相区和16个三相区组成,而在1073 K时除富B部分外,还有8个单相区、14个两相区和7个三相区。
Nd-Fe-B-based alloys as sintered Nd2Fe14B-typed permanent magnets have been studied extensively due to their excellent magnetic properties. In this work, the experimental information on the corresponding phase equilibria of the Nd-Fe-B ternary system in the published literature is reviewed first. The key Nd-Fe-B alloys annealed at 873 and 1073 K were then investigated experimentally to determine the phase equilibria of the system using x-ray diffraction technique and scanning electron microscope (SEM) with energy dispersive spectrometry (EDS). The ternary intermetallic compound, Nd2Fe14B with space group P42/mnm as Nd2Fe14B structure type, NdFe4B4with space group Pccn as REl.11Fe4B4structure type and Nd5Fe2B6with space group Rm as Pr5Co2B6structure type were confirmed at 873 and 1073 K. The binary intermetallic compound Nd5Fe17is stable at 873 K, while it was not found at 1073 K. The phase equilibria of the Nd-Fe-B ternary system consists of 14 single-phase regions, 28 two-phase regions and 16 three-phase regions at 873 K, while there are 8 single-phase regions, 14 two-phase regions and 7 three-phase regions at 1073 K except for the B-rich part.
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