Effects of Cr₃C₂ content and wheel speed on amorphization behavior of melt-spun SmCo_7-x(Cr₃C₂)_x alloys

详细信息	查看全文 | 推荐本文 |

• 作者：Li-ya LI ; ^{liliya@csu.edu.cn} ; Jian-hong YI ; Ai-kun LI ; Yuan-dong PENG ; Qing-lin XIA
• 关键词：SmCo7-type permanent magnets ; Cr3C2 ; melt spinning ; amorphization ; hysteresis loops
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：May, 2012
• 卷：22
• 期：5
• 页码：1118-1122
• 文件大小：343 K

摘要

The effects of the Cr₃C₂ content and wheel speed on the amorphization behavior of the melt-spun SmCo_7-x(Cr₃C₂)_x (x=0.10-0.25) alloys were studied systematically by X-ray diffraction analysis (XRD), differential scanning calorimetry (DSC) and magnetic measurements. The ribbon melt-spun at lower wheel speed (20 m/s) has composite structure composed of mostly SmCo₇ and a small amount of Sm₂Co₁₇R. The grain size of SmCo₇ phase decreases with the increase of Cr₃C₂ content. With the increase of wheel speed, the XRD peaks become lower and accompanied with a broad increase in backgrounds, indicating a considerable decrease in the grain size of the SmCo₇ phase. When the wheel speed increases to 40 m/s, SmCo_7-x(Cr₃C₂)_x alloys can be obtained in the amorphous state for 0.15鈮?em>x鈮?.25 with intrinsic coercive H_ci of 0.004-0.007 T. The DSC analysis reveals that SmCo₇ phase firstly precipitates from the amorphous matrix at 650 掳C, followed by the crystallization of Sm₂Co₁₇ phase at 770 掳C.