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The microstructure and magnetic properties of NdFeB magnets directly solidified at a low cooling rate |
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| Authors: | Zongjun Tian Shandong Li Kun Peng Benxi Gu Jianrong Zhang Mu Lu Youwei Du |
| Affiliation: | a College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China b National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, PR China c College of Materials Science and Engineering, Hunan University, Changsha 410082, PR China |
| Abstract: | Nd12.5Fe82B5.5 ribbons have been prepared by a melt spinning technique at a wheel speed ranging from 5 to 22 m/s. It was found that the wheel speed vR dramatically influences the microstructure and magnetic properties of the ribbons. At an optimized vR, a structure with single-phase Nd2Fe14B and an enhanced coupling between grains give rise to excellent magnetic properties. For example, the coercivity, remanence ratio, and maximum energy product of the best sample quenched at a wheel speed of 13 m/s are 1227.4 kA/m, 0.76, and 182.6 kJ/m3, respectively. In comparison with the samples from under- and over-quenched conditions and all the samples with annealing, the as-quenched sample fabricated at the optimized wheel speed has the best magnetic properties. |
| Keywords: | Permanent magnets Exchange coupling Nanostructure Melt spinning |
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