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

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第7期    总第208期    2016年7月

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文章编号:1004-0609(2016)-07-1459-07
Sm(CobalFe0.108Cu0.131Zr0.042)7.0时效过程中的微结构演变与磁性能
李丽娅,高 智,葛毅成,邓 辉,易健宏,彭元东

(中南大学 粉末冶金国家重点实验室,长沙 410083)

摘 要: 采用透射电镜(TEM)、场发射扫描电镜(FESEM)、X射线衍射(XRD)等方法系统研究Sm(CobalFe0.108Cu0.131Zr0.042)7.0在830 ℃时效处理10~30 h过程中的微结构演变及磁性能。结果表明:合金时效处理后形成由菱方Sm2Co17R主相和六方Sm(Co,Cu)5胞壁相构成的胞状结构、叠加在胞状结构之上的六方富Zr片状结构和少量富Zr的Sm(CoCuFeZr)x析出相。随830 ℃时效处理时间由10 h延长到30 h,Sm2Co17R主相的尺寸由80~110 nm长大到150 nm,富Zr片状相的密度增大,富Zr的Sm(CoCuFeZr)x析出相的体积分数增多。富Cu的SmCo5胞壁相和富Zr的Sm(CoCuFeZr)x析出相通过钉扎畴壁为合金提供高的室温和高温矫顽力。磁性能测试结果表明:剩磁Br随830 ℃时效时间的延长而单调增大,内禀矫顽力Hci在830 ℃处理20 h时达最大值2417.9 kA/m,在测试温度为500 ℃时仍具有高的Hci,为693.5 kA/m。

 

关键字: Sm2Co17型稀土永磁材料;时效处理;析出物;胞状结构

Microstructure transformation and magnetic properties of Sm(CobalFe0.108Cu0.131Zr0.042)7.0 during annealing treatment
LI Li-ya, GAO Zhi, GE Yi-cheng, DENG Hui, YI Jian-hong, PENG Yuan-dong

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

Abstract:Microstructure and magnetic properties of Sm(CobalFe0.108Cu0.131Zr0.042)7.0 annealed at 830 ℃ for 10-30 h have been systematically investigated by means of transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and magnetic measurement. It is found that the heat-treated alloy consists of the rhombohedral Sm2Co17 phase as the cell and the hexagonal Sm(CoCu)5 as the cell boundary phases. In addition, the structure contains Zr-rich plate-like phase on the basal planes, running across both the cells and cell boundaries, as well as Zr-rich Sm(CoCuFeZr)x precipitates. It is obvious that the annealing time significantly affects the microstructure. With increasing the annealing time from 10 h up to 30 h, the Sm2Co17R cell size increases from 80-110 nm to 150 nm and becomes uniform, the density of platelet phase and the content of Sm(CoCuFeZr)x precipitates also increase. The Cu-rich SmCo5 sell boundary phase and Zr-rich Sm(CoCuFeZr)x precipitates are responsible for the high coercivity at both room and high temperature. Magnetic analysis shows that the remanence Br enhances from 0.625T to 0.845T with the annealing time increasing from 10 to 30 h. The intrinsic coercivity Hci reaches the maximum value of about 2417.9 kA/m at room temperature and 693.5 kA/m at 500 ℃ after annealing for 20 h.

 

Key words: Sm2Co17-based high temperature permanent magnet; annealing treatment; precipitate; cellular structure

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

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

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