Van Dao Nguyen , Taek-Soo Kim , Sun-woo Nam , Myung-suk Song , Dong-Hwan Kim , Hyo-young Park , YeeUn Lee , Soon-Jik Hong
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引用次数: 0
Abstract
The heterogeneous structure is unfavorable in hot deformed magnets due to poor magnetic properties. In our previous results, the initial melt-spun powder of type MQU-F also exhibited a heterogeneous microstructure, which could be a contributing factor. In this work, anisotropic nanocrystalline NdFeB magnets of a large size were prepared from commercial MQU-F powder by using spark plasma sintering (SPS) followed by hot deformation (HD). The microstructure evolution from the heterogeneous structure from the powder to the final HD magnet is thoroughly investigated. This study minimized coarse grain regions and provided superior grain alignment by optimizing the HD process. As a result, a Ф30mm NdFeB magnet with a remanence of 13.84 kGs, a coercivity of 15.79 kOe, and a maximum energy product of 47 MGOe was successfully obtained.
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The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public.
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