摘要
采用 Ｂｒｉｄｇｍａｎ法制备了 ＳｍＭｎｓｂ化合物在微米尺度上定向规则排列的含 Ｓｉｎ的 Ｓｂ－Ｍｎ合金自生复合材料，研究了 Ｓｍ对复合材料组织的影响和不同含 Ｓｍ量下的共晶平界面生长条件结果表明：加入 Ｓｍ使 Ｓｂ－Ｍｎ合金复合材料的磁化强度大幅度提高，并使其在室温和高温下均呈易轴磁化特征．但当含 Ｓｍ量为 ５％时，出现富 Ｓｍ化合物相，磁化强度有所下降提高生长速度，形成一相枝品加两相共晶混和组织，尽管其磁化强度较完全两相共晶复合材料低，但仍高于不含 Ｓｍ的 ＭｕＳｂ／Ｓｂ共晶复合材料，并呈现出自旋重取向．
The samarium containing Sb-Mn alloy in situ composites with an aligned array of SmMnSb compounds embedded in Sb matrix on a micron scale have been produced by Bridgman technique. The present approach reveals the effects of Sm on the microstructures of the composites and the condition of the Sm containing eutectic growth with a plane interface. A notable increase in magnetization of Sb-Mn alloy composites is observed with Sm addition. The composites have a characteristic of easy-axis magnetization at both room and elevated temperatures. However, the Sm rich compounds appear when Sm addition exceeds 5%, which makes the magnetization drop to a certain extent. The mixed structures of one phase dendrite and two-phase eutectic are developed with increasing crystal growth velocity. In this case, the composites with mixed structure have a more inferior property than the two-phase eutectic composites, but superior to that of MuSb/Sb eutectic composite without Sm, and a spin reorientation has emerged in the composites.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第3期319-324,共6页
Acta Metallurgica Sinica
基金
高等学校博士学科点专项科研基金!9328605
江苏省应用基础研究计划资助项目! BJ95021
关键词
复合材料
Sb-Mn合金
磁性能
定向凝固
钐
composite, Sb-Mn alloy, rare-earth Sm, magnetic property, directional solidification
