Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 5    May 2012

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Effects of Cr3C2 content and wheel speed on amorphization behavior of melt-spun SmCo7−x(Cr3C2)x alloys
LI Li-ya, YI Jian-hong, LI Ai-kun, PENG Yuan-dong, XIA Qing-lin

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract:The effects of the Cr3C2 content and wheel speed on the amorphization behavior of the melt-spun SmCo7−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, SmCo7−x(Cr3C2)x alloys can be obtained in the amorphous state for 0.15≤x≤0.25 with intrinsic coercive Hci of 0.004−0.007 T. The DSC analysis reveals that SmCo7 phase firstly precipitates from the amorphous matrix at 650 °C, followed by the crystallization of Sm2Co17 phase at 770 °C.

 

Key words: SmCo7-type permanent magnets; Cr3C2; melt spinning; amorphization; hysteresis loops

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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