Effects of Cr_3C_2 content and wheel speed on amorphization behavior of melt-spun SmCo_(7-x)(Cr_3C_2)_x alloys  

Cr_3C_2含量和快淬速度对SmCo_(7-x)(Cr_3C_2)_x合金非晶化行为的影响(英文)

作　　者：李丽娅[1] 易健宏[1] 李爱坤[1] 彭元东[1] 夏庆林[1] 

机构地区：[1]中南大学、粉末冶金国家重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第5期1118-1122,共5页中国有色金属学报（英文版）

基　　金：Project (51104188) supported by the National Natural Science Foundation for Young Scholars of China

摘　　要：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.通过X射线衍射法（XRD）、差示扫描量热法（DSC）和磁性测量等方法系统研究Cr3C2含量和快淬速度对SmCo7-x（Cr3C2）x（x=0.10-0.25）非晶化行为的影响。结果表明,在低的快淬速度下（20m/s）下,合金主要由SmCo7主相和少量Sm2Co17R相构成,且SmCo7相的晶粒尺寸随着Cr3C2含量x的增加而减小。随着快淬速度的增加,合金的XRD衍射峰强度变弱、衍射峰宽化,表明SmCo7主相的晶粒尺寸随着快淬速度的增加而减小。当快淬速度增加至40m/s时,SmCo7-x（Cr3C2）x（0.15≤x≤0.25）合金均形成了非晶态结构,合金的磁滞回线表现为软磁性的窄回线,矫顽力为0.004-0.007T。采用DSC对合金的晶化行为分析表明,在650°C时SmCo7相首先从非晶基体中析出,在770°C时Sm2Co17相析出。

关 键 词：SmCo7-type permanent magnets CR3C2 melt spinning amorphization hysteresis loops 

分 类 号：TG131[一般工业技术—材料科学与工程]