Effect of Pre-Aging Treatment on the Microstructure and Magnetic Properties of Sm(Co,Fe,Cu,Zr)7.8 Sintered Magnets
Effect of Pre-Aging Treatment on the Microstructure and Magnetic Properties of Sm(Co,Fe,Cu,Zr)7.8 Sintered Magnets
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DOI：
10.2320/matertrans.mbw201325
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发表时间：
2014-03
影响因子：
1.2
通讯作者：
Yosuke Horiuchi;M. Hagiwara;Keiko Okamoto;Tsuyoshi Kobayashi;M. Endo;Tadahiko Kobayashi;N. Sanada
中科院分区：
文献类型：
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作者：
Yosuke Horiuchi;M. Hagiwara;Keiko Okamoto;Tsuyoshi Kobayashi;M. Endo;Tadahiko Kobayashi;N. Sanada
研究了预时效处理对Sm（Cobal.Fe0.35Cu0.06Zr0.02）7.8合金显微组织和磁性能的影响。固溶处理磁体和预时效磁体的主相均为1：7相，这两种磁体的X射线衍射轮廓没有明显差异。通过扫描透射电子显微镜-能量色散X射线能谱分析，在预时效磁体中观察到几十纳米大小的细小富铜沉淀物，但在固溶处理磁体中没有观察到这种沉淀物。对于完全时效的磁体，预时效磁体中的晶胞尺寸小于未预时效磁体中的晶胞尺寸。因此，预老化处理得到精细的蜂窝状结构。预时效磁体的Mr和HcJ与未预时效磁体的Mr和HcJ几乎相同。预时效处理提高了完全时效磁体退磁曲线的方度。结果，进行了预时效处理的磁体的（BH）max大于未进行预时效处理的磁体的（BH）max。精细的细胞结构似乎导致更高的方形度。Sm（Coal.Fe0.35Cu0.06Zr0.02）7.8合金经预时效处理后的磁性能为：Mr = 1.24T，HcJ = 1490 kA/m，（BH）max = 266 kJ/m3。[doi：10.2320/matertrans.MBW201325]
The effects of pre-aging treatment on the microstructure and magnetic properties of Sm(Cobal.Fe0.35Cu0.06Zr0.02)7.8 were investigated. The main phase of both solution-treated magnet and pre-aged magnet was the 1 : 7 phase, and there were no distinct differences between the X-ray diffraction profiles of these magnets. Fine Cu-rich precipitates a few tens of nanometers in size were observed in pre-aged magnet by scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy mapping, but such precipitates were not observed in solution-treated magnet. As for fully aged magnets, the cell size was smaller in pre-aged magnet than in non-pre-aged magnet. Thus, the pre-aging treatment gave a fine cellular structure. Mr and HcJ of pre-aged magnet were almost same as those of non-pre-aged magnet. Squareness of the demagnetization curve for fully aged magnet was increased by pre-aging treatment. As a result, (BH)max of magnet subjected to pre-aging treatment was greater than that of magnet not subjected to pre-aging treatment. The fine cellular structure seemed to result in higher squareness. The following magnetic properties were obtained for Sm(Cobal.Fe0.35Cu0.06Zr0.02)7.8 by pre-aging treatment: Mr = 1.24T, HcJ = 1490 kA/m, and (BH)max = 266 kJ/m3. [doi:10.2320/matertrans.MBW201325]