超微晶软磁合金的结构与磁性稳定性关系

RELATIONSHIP BETWEEN STRUCTURE AND MAGNETIC PROPERTIES OF SOFT NANOCRYST ALLINEALLOYS

用Ｘ射线衍射与差热分析相结合的方法研究了Ｆｅ＿（７３．５）Ｃｕ＿（１）Ｎｂ＿（３）（Ｓｉ，Ｂ）＿（２２．５），非晶合金中α－ＦｅＳｉ晶化相的形核、晶界作晶相以及晶化激活能与硅含量的关系。结果表明，随硅含量的增加，晶化激活能降低，α相易于形核，相应的晶化温度与最佳热处理温度也降低。超微晶Ｆｅ＿（７３．５）Ｃｕ＿（１）Ｎｂ＿（３）（Ｓｉ，Ｂ）＿（２２．５），的磁性不仅与α－ＦｅＳｉ晶化相有关，而且还与晶界非晶相的铁磁性密切相关。作品相铁磁性的降低使相邻晶粒间的铁磁耦合减弱，从而使合金的软磁性能下降。

Nucleation of α-FeSi crystalline phase, amorphous grainboundary phase and the relatior1ship betaren activation energy of crystallization Si content of Fe_(73.5)Cu_(1)Nb_(3)(Si,B)_(22.5)amorphous alloys have been investigated by X-ray diffratction and thermal analysis.The results show that the activation energy of crystallization decreases with increasing Si content;therefore,α-Phase is prone to mucleation,and the crystallization temperature and optimum annealing temperature also decrease.The relationship between the structure and magnetic propertes of nanocrystalline alloy Fe_(73.5)Cu_(1)Nb_(3)(Si,B)_(22.5) de-pends not only on the α-FeSi crystalline phase but also closely on the ferromagnetismof amorphous grainboundary phase.The ddrop of the ferromagnetism of amorphous phase will weaken th eferromagnetic coupling between the adjacent nanocrystalline grains;Therefore,the soft magnetic properties of the alloy will decrease.