宽过冷液相区铁基非晶合金的形成和磁性  

FORMATION AND MAGNETIC PROPERTIES OF FERROMAGNETIC AMORPHOUS ALLOYS WITH WIDE SUPERCOOLED LIQUID REGION

作　　者：徐民[1] 全明秀[1] 胡壮麒[1] 赵玉华[2] 程力智[2] 何开元[2] 

机构地区：[1]中国科学院金属研究所快速凝固非平衡合金国家重点实验室 [2]东北大学

出　　处：《材料研究学报》2001年第4期425-431,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金资助项目59871053.

摘　　要：用熔体急冷法制备出具有明显的玻璃转变和较宽的过冷液相区的 Ｆｅ－Ｃｏ－（Ｎｂ）－Ｚｒ－Ｂ非晶合 金，研究了热稳定性和软磁性能．结果表明，在Ｆｅ－Ｃｏ－Ｚｒ－Ｂ四元合金中添加适量的Ｎｂ可以显著扩大 过冷液相区，提高合金的热稳定性．当冷却速率降低时，急冷合金具有非晶和纳米晶的复相结构．非晶合金 的饱和磁化强度随Ｎｂ含量的增加而减小．不同Ｎｂ含量的非晶合金的饱和磁致伸缩系数均较低．在低于 晶化温度的温度下退火可以有效地降低矫顽力，改善软磁性能．晶化导致软磁性能降低．Fe-Co-(Nb)-Zr-B amorphous alloys with an obvious glass transition and a wide supercooled liquid region before crystallization were successfully formed by means of melt-spinning. The thermal stability of the supercooled liquid and magnetic properties were also investigated. The enhancement of the thermal stability and glass-forming ability was found in the replacement of Zr by 2%-4% (atomic fraction) Nb. The structure of the melt-spun alloys changes to amorphous and nanocrystalline phases at a relatively low cooling rate. The saturation magnetization of the alloys decreases with increasing Nb content. The saturated magnetostriction of the glassy alloys with different Nb content is comparatively low. The coercive force is lowered and the soft magnetism is improved by annealing treatment at the temperature below the crystallization temperature. The crystallization leads to a significant decrease in the soft magnetic properties.

关 键 词：铁基非晶合金 过冷液相区 玻璃形成能力 软磁性能 磁性 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG113.225[金属学及工艺—合金]