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Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII
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Understanding the element segregation and phase separation in the Ce-substituted Nd-(Fe,Co)-B based alloys
L Z Zhao1,2, J S Zhang3, G Ahmed3
1School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China. lzzhao@hdu.edu.cn.
Scientific Reports
|May 3, 2018
Summary
Ce-substituted Nd-Fe-B magnets show promise, but element segregation is unclear. This study reveals Nd prefers the main phase while Ce enters a secondary phase, leading to an abnormal coercivity increase due to phase separation.
Area of Science:
- Materials Science
- Solid State Physics
- Magnetism
Background:
- Neodymium-iron-boron (Nd-Fe-B) permanent magnets are crucial for advanced technologies.
- Cerium (Ce) substitution offers a potential cost-performance improvement but introduces complexities in phase behavior.
- Understanding element segregation and phase separation is key to optimizing these magnetic materials.
Purpose of the Study:
- To investigate the effects of Ce substitution on the microstructure and magnetic properties of Nd-Fe-B magnets.
- To elucidate the mechanisms of element segregation and phase separation in (Nd,Ce)-Fe-Co-Al-B alloys.
- To correlate microstructural changes with coercivity enhancement.
Main Methods:
- Preparation of (Nd1-xCex)25Fe40Co20Al4B11 alloys using copper mold casting.
- Detailed microstructural analysis using advanced characterization techniques.
- Compositional analysis to determine element distribution and phase identification.
Main Results:
- Observed segregation of rare earth elements, with Nd favoring the Nd2Fe14B (2:14:1) phase and Ce entering the secondary 1:2 phase.
- The presence of the 1:2 phase was found to promote element segregation.
- An anomalous increase in coercivity was observed for Ce content x=0.3, attributed to the phase separation of the 2:14:1 phase.
Conclusions:
- The study clarifies the distinct site preferences of Nd and Ce in the alloy system.
- Phase separation within the main 2:14:1 phase is identified as the cause for enhanced coercivity.
- Findings provide critical insights for the development of high-performance, cost-effective Ce-containing Nd-Fe-B magnets.
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