Relationship between controllable preparation and microstructure of NdFeB sintered magnets |
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| Affiliation: | 1. Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China;2. College of Science, Northeastern University, Shenyang 110819, China;1. College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, China;2. Frontier Institute of Science and Technology, Xi''an Jiaotong University, Xi’an 710049, China;1. Elements Strategy Initiative Center for Magnetic Materials (ESICMM), National Institute for Materials Science, Tsukuba 305-0047, Japan;2. Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba 305-8577, Japan;3. Toyota Motor Corporation, Advanced Material Engineering Div., Susono 410-1193, Japan;4. Center for Integrated Sensor Systems, Danube University Krems, Krems, Austria;1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, PR China;2. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, PR China;1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China;2. Yantai Shougang Magnetic Materials Inc, Yantai 265500, China;3. Jiangsu University of Science and Technology, Zhenjiang 212003, China;1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, PR China;2. Ganzhou Fortune Electronics Co., Ltd., Ganzhou, 341000, PR China;3. JL MAG Rare-Earth Co., Ltd., Ganzhou, 341000, PR China |
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| Abstract: | The double hard magnetic phase magnets with nominal compositions of Nd30–xDyxFe69B1(x=2, and 4) (wt.%) were prepared. The magnetic properties of the magnets were measured with a NIM-2000H hysteresigraph. The crystalline structures of the magnets were identified by X-ray diffraction (XRD). The Rietveld refinement was carried out using the FULLPROF software. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses were carried out in order to investigate the microstructure of the magnets. It showed that the magnets consisted mainly of Nd2Fe14B phase, and some Nd-rich phase. Two types of matrix-phase grains in dark grey and light grey were found in the magnets with x=2 and 4. The Dy content was obviously different in the two types of grains, which proved that the double hard magnetic phases (Dy-rich and Dy-lean phases) coexisted in the magnet. It revealed that the Nd-rich phases in junction regions had fcc structure, with the unit cell parameter of about 0.52–0.56 nm. The weak superlattice spots were found in the SAD patterns of the junction Nd-rich phases with large scale. The double hard magnetic phase structure seemed to improve the magnetic properties of NdFeB magnets with high coercivity, while decrease the consumption of Dy element, compared with the single alloy magnet. |
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| Keywords: | NdFeB magnet double hard magnetic phase structure Dy content coercivity rare earths |
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