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2417.9kA/m,在测试温度为500℃时仍具有高的Hci,为693.5 kA/m。
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 0.625 T to 0.845 T with the annealing time increasing from 10 to 30 h. The intrinsic coercivity H（ci） 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2016年第7期1459-1465,共7页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51574293)
云南省新材料制备与加工重点实验室创新课题资助项目(2016cx04)~~
关键词
Sm2Co17型稀土永磁材料
时效处理
析出物
胞状结构
Sm2Co17-based high temperature permanent magnet
annealing treatment
precipitate
cellular structure
