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| Effects of Ni on the magnetic and mechanical properties of hot-deformed Nd-Fe-B magnets |
| ZHANG Yanghu1,2, HE Hongjiang1,2, ZUO Zhijun2,3, SHI Rongying2,3, LI Jianjun2,4, ZHAO Lixin2,5, HUANG Guangwei1,2, ZHENG Liyun1,2 |
1. College of Materials Science and Engineering, Hebei University of Engineering, Handan 056000, China;
2. Hebei Rare Earth Permanent Magnet Materials and Applied Engineering Research Center, Handan 056000, China;
3. Langfang Jing Magnetic Precision Materials Co., Ltd., Langfang 065000, China;
4. Hebei Xinsi Da Electric Co., Ltd., Shijiazhuang 050000, China;
5. College of Machinery and Equipment, Hebei University of Engineering, Handan 056000, China |
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Abstract To improve the mechanical properties of hot-pressed/hot-deformed anisotropic Nd-Fe-B magnets, high-melting-point metal element Ni with weak magnetism has been doped into the magnets. The influence of Ni on the magnetic, mechanical properties and microstuctures of the Nd-Fe-B magnets were investigated. The results show that average bending strength of the Ni-doped Nd-Fe-B magnets increases fistly and then decreases with increasing Ni mass fraction from 0 to 5%. The Nd-Fe-B magnet with 2%Ni exhibites the highest average bending strength (212 MPa), and the maximum energy product still retains at more than 40 MGOe. The morphology of the fracture surface of the magnets reveales that the enriched Ni near the pore can strengthen and toughen the grain boundary phase, therefore enhence the crack propagation resistance of grain boundary phase, and improve the bending strength of the magnets.
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Received: 16 November 2020
Published: 22 March 2021
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2021, Vol. 26 
