Microstructure and hard magnetic properties of nanocomposite Sm2Fe15Ga2Cx permanent magnets with an excess of Fe prepared directly by melt spinning
Microstructure and hard magnetic properties of nanocomposite Sm2Fe15Ga2Cx permanent magnets with an excess of Fe prepared directly by melt spinning
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DOI：
10.1063/1.120939
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发表时间：
1998-06
影响因子：
4
通讯作者：
Zhaohua Cheng;Jun-Xian Zhang;Hui-qun Guo;J. V. Lier;H. Kronmüller;B. Shen
中科院分区：
文献类型：
--
作者：
Zhaohua Cheng;Jun-Xian Zhang;Hui-qun Guo;J. V. Lier;H. Kronmüller;B. Shen
采用熔体快淬法直接制备了低Sm含量的Sm-Fe-Ga-C纳米复合材料。一个高度各向同性的剩磁饱和磁化强度比为0.6-0.7和一个相对较高的矫顽力为5.5 kOe的淬火薄带实现。X射线衍射和热磁分析表明，快淬薄带由Sm 2Fe 15 Ga 2Cx硬磁相和α-Fe软磁相组成。透射电子显微镜观察表明，2：17型主相具有较大的晶粒，而次相α-Fe的晶粒较小，分散在主相的晶界上。剩磁的增强是由于晶粒间的交换耦合。微观结构和磁性被发现敏感地依赖于衬底速度。讨论了显微组织对硬磁性能的影响。
The nanocomposites Sm–Fe–Ga–C with low Sm contents have been prepared directly by melt spinning without a subsequent heat treatment. A highly isotropic remanence to saturation magnetization ratio of 0.6–0.7 and a relatively high coercivity of 5.5 kOe were achieved from the as-quenched ribbons. X-ray diffraction and thermomagnetic analyses show that the as-quenched ribbons consist of a magnetically hard phase Sm2Fe15Ga2Cx and a magnetically soft phase α-Fe. Transmission electron microscopy observation demonstrates that the major 2:17-type phase has larger crystallites and the crystallites of the minor phase α-Fe are smaller and located separately at the grain boundaries of the major phase. The remanence enhancement is attributed to the exchange coupling between the intergrains. Both microstructure and magnetic properties are found to depend sensitively on the substrate velocity. The effect of the microstructure on hard magnetic properties has been discussed.