Enhanced mechanical properties in die-upset Nd-Fe-B magnets via die-upsetting process |
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Authors: | HU Zhihua QU Haijin ZHAO Jiaqi LUO Cheng LI Jun LIU Ying |
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Affiliation: | 1. Department of Materials Engineering, Hubei University of Automotive Technology, Shiyan 442002, China 2. Material & Technology Institute, Dongfeng Motor Company Limited, Shiyan 442001, China 3. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China |
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Abstract: | The mechanical properties of die-upset Nd-Fe-B magnets produced at different die-upset processes were investigated. The results showed that the optimum comprehensive mechanical properties of die-upset Nd-Fe-B magnets were obtained at the deformation temperature of 680 °C. The anisotropy of Vickers hardness was more obvious at the die-upset level of 55%, and the Vickers hardness measured parallel to the c-axis was significantly lower than that perpendicular to the c-axis. The fracture toughness measured parallel to the c-axis first increased, and then decreased with increase in die-upset level. The maximum fracture toughness of Nd-Fe-B magnets was obtained at the die-upset level of 60%. The microstructure showed that the width of defect layers and the average size of large grains increased, and the layered structure of die-upset Nd-Fe-B magnets was obviously different with increase in the die-upset level. |
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Keywords: | Nd-Fe-B magnets mechanical properties die-upset level fracture toughness Vickers hardness rare earths |
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