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Phase Equilibria and Magnetic Phases in the Ce-Fe-Co-B System

机译:Ce-Fe-Co-B系统中的相平衡和磁相

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摘要

Ce-Fe-Co-B is a promising system for permanent magnets. A high-throughput screening method combining diffusion couples, key alloys, Scanning Electron Microscope/Wavelength Dispersive X-ray Spectroscope (SEM/WDS), and Magnetic Force Microscope (MFM) is used in this research to understand the phase equilibria and to explore promising magnetic phases in this system. Three magnetic phases were detected and their homogeneity ranges were determined at 900 °C, which were presented by the formulae: Ce2Fe14−xCoxB (0 ≤ x ≤ 4.76), CeCo4−xFexB (0 ≤ x ≤ 3.18), and Ce3Co11−x FexB4 (0 ≤ x ≤ 6.66). The phase relations among the magnetic phases in this system have been studied. Ce2(Fe, Co)14B appears to have stronger magnetization than Ce(Co, Fe)4B and Ce3(Co, Fe)11B4 from MFM analysis when comparing the magnetic interactions of selected key alloys. Also, a non-magnetic CeCo12−xFexB6 (0 ≤ x ≤ 8.74) phase was detected in this system. A boron-rich solid solution with Ce13FexCoyB45 (32 ≤ x ≤ 39, 3 ≤ y ≤ 10) chemical composition was also observed. However, the crystal structure of this phase could not be found in the literature. Moreover, ternary solid solutions ε1 (Ce2Fe17−xCox (0 ≤ x ≤ 12.35)) and ε2 (Ce2Co17−xFex (0 ≤ x ≤ 3.57)) were found to form between Ce2Fe17 and Ce2Co17 in the Ce-Fe-Co ternary system at 900 °C.
机译:Ce-Fe-Co-B是用于永磁体的有前途的系统。本研究使用一种结合了扩散偶,关键合金,扫描电子显微镜/波长色散X射线光谱仪(SEM / WDS)和磁力显微镜(MFM)的高通量筛选方法,以了解相平衡并探索有前途的系统中的磁性相。检测了三个磁相,并在900°C下确定了它们的均匀性范围,由以下公式表示:Ce2Fe14-xCoxB(0≤x≤4.76),CeCo4-xFexB(0≤x≤3.18)和Ce3Co11-x FexB4 (0≤x≤6.66)。研究了该系统中磁相之间的相位关系。当比较所选关键合金的磁性相互作用时,根据MFM分析,Ce2(Fe,Co)14B似乎比Ce(Co,Fe)4B和Ce3(Co,Fe)11B4具有更强的磁化强度。另外,在该系统中检测到非磁性CeCo12-xFe x B 6 (0≤x≤8.74)相。 Ce 13 Fe x Co y B 45 的富硼固溶体(32≤x≤39, 3≤y≤10)也观察到化学组成。但是,在文献中找不到该相的晶体结构。此外,三元固溶体ε 1 (Ce 2 Fe 17− x Co x (0≤ x ≤12.35))和ε 2 (Ce 2 Co 17− <发现在Ce x Fe x (0≤ x ≤3.57) Ce-Fe-Co三元体系中900°C时> 2 Fe 17 和Ce 2 Co 17

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