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Author(s): |
Cai-yin You, School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Zheng-xin Lu, School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Yu Qiao, School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Dan Bao, School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China |
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Abstract: |
Delicate characterization of the microstructure and fully understanding of the microstructure- property relationship of magnets are of significance to further enhance the magnetic properties of magnets. In this work, we carefully characterized the microstructure of a commercial sintered Nd-Fe-B magnet and analyzed its microstructure-property relationship. The magnet has a magnetic property: Hc=1174 kAm-1, Mr = 0.98 T, (BH)max=245 kJm-3. In terms of the initial magnetized curve and the coercivity dependence on measuring temperature, the coercivity of the magnet was dominantly controlled by nucleation mechanism. The analyses of scanning electron microscopy (SEM) and X-ray dispersion spectra (EDS) show that magnet consists of matrix Nd2Fe14B, Nd-rich phase and boundaries. Transmission electron microscopy (TEM) analyses indicate that triple junctions possess a non-uniform Nd-rich composition and multi-phase structure. There exist two types of Nd-rich boundaries: amorphous Nd-rich plate boundary and nano-crystalline Nd-rich boundary.
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