不同淬速下α-Fe/Nd_2Fe_(14)B复合纳米晶结构的形成  

The formation of α-Fe / Nd_2Fe_(14)B nanocomposites microstructure by quenching NdPrFeCoB melt at different quenching speeds

作　　者：李伟[1] 杨丽[1] 关颖[1] 谌岩[1] 张克勤[1] 张静武[1] 张湘义[1] 

机构地区：[1]燕山大学材料科学与工程学院,河北秦皇岛066004

出　　处：《功能材料》2004年第1期34-36,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10174059);河北省自然科学基金资助项目(502172)

摘　　要：　采用X射线衍射分析、透射电子显微分析技术及振动样品磁强计研究了Nd3.6Pr5.4Fe83Co3B5合金熔体在不同淬速下α Fe/Nd2Fe14B复合纳米晶结构的形成和磁性。结果表明,在淬速低于20m/s时随着淬速的升高Nd2Fe14B和α Fe纳米晶的尺寸变得均匀、细小,α Fe相的体积分数增加。当辊速由10m/s增加到20m/s时,Nd2Fe14B和α Fe相的晶粒尺寸分别由51.2nm和30.2nm减小到13.4nm和16.3nm,α Fe相的体积由31.9%增至48.6%,并在20m/s时获得了193.6kJ/m3的最大磁能积。In this study, the formation and magnetic properties of α-Fe/Nd_2Fe_(14)B nanocomposites were studied by using transmission electron microscope, X-ray diffractometer and vibrating sample magnetometer at different quenching speeds. Results show that the average grain size of alloys become uniform and fine with the increase of quenching speed under 20m/s while the volume fraction of α-Fe phase was increased. When the quenching speed was increased from 10 m/s to 20m/s, the grains of the Nd_2Fe_(14)B and α-Fe phases decreased separately from 51.2nm to 13.4nm and 30.2nm to 16.3nm, and the volume fraction of α-Fe phase increased from 31.9% to 48.6%. At the optimal quenching speed of 20m/s, the maximum energy product of the nanocomposites was 193.6kJ/m^3.

关 键 词：复合纳米晶永磁合金 快淬速度 透射电子显微分析 X射线衍射 

分 类 号：TM273[一般工业技术—材料科学与工程]