Isothermal aging–microstructure–property relationship of SmCo 2:17 magnets
Isothermal aging–microstructure–property relationship of SmCo 2:17 magnets
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DOI：
10.1179/174328406x131046
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发表时间：
2006-12
影响因子：
1.8
通讯作者：
Q. Zheng;S. Xia;A. Dozier;T. Zhai;J. Willhite;M. Effgen
中科院分区：
文献类型：
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作者：
Q. Zheng;S. Xia;A. Dozier;T. Zhai;J. Willhite;M. Effgen
本研究研究了 SmCo 2:17 合金的等温时效-微观结构-磁性能关系。该合金还含有 Fe、Cu 和 Zr 作为主要添加物。其磁性能，包括内禀矫顽力 Hci、剩磁 Br 和最大磁能积 (BH)max，是从测量的第二象限 M-H 磁滞曲线中获得的。使用 X 射线衍射 (XRD) 和 TEM 对合金的微观结构进行了表征。研究发现，随着一级时效温度从850℃升高到900℃，SmCo 2:17合金磁体的剩磁增加，而矫顽力降低。通过采用两步时效（首先在 900°C 时效，然后在 850°C 时效），磁体的最大磁能积 (HB)max 得到显着提高。基于XRD和TEM分析，讨论了时效条件对显微组织和磁性能的影响。当前工作中观察到的微观结构变化包括细胞结构的细胞尺寸和细胞边界处的铜偏析程度。晶胞边界处Cu偏析程度的变化可能是不同时效条件下时效合金矫顽力变化的主要原因。时效条件对剩磁的影响可归因于时效条件对蜂窝结构的泡孔尺寸的影响，从而影响合金中SmCo 2:17相的体积分数。
The isothermal aging–microstructure–magnetic property relationship of a SmCo 2:17 alloy was investigated in the present study. The alloy also contained Fe, Cu and Zr as major addition. Its magnetic properties, including intrinsic coecivity Hci, remanence Br and maximum energy product (BH)max, were obtained from the measured second quadrant M–H hysteresis curves. The microstructure of the alloy was characterised using X-ray diffraction (XRD) and TEM. It was found that, as the one step aging temperature was increased from 850 to 900°C, the remanence of the SmCo 2:17 alloy magnet was increased while its coercivity was reduced. The maximum energy product (HB)max of the magnet was significantly improved by applying a two step aging, consisting of aging first at 900°C followed by aging at 850°C. Based on XRD and TEM analyses, effects of the aging condition on the microstructure and magnetic properties were discussed. The microstructural change observed in the current work included cell size of the cellular structure and the degree of Cu segregation at the cell boundaries. Change in the degree of Cu segregation at the cell boundaries might be the major cause for the change in coercivity of the alloy aged in different aging conditions. The effect of aging condition on the remanence could be attributed to the effect of aging condition on cell size of the cellular structure, which affects the volume fraction of SmCo 2:17 phase in the alloy.