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基于Finemet合金的成分及其非晶前驱体的晶化特征,提出了Finemet型合金的“双团簇”结构模型和团簇式成分,即Finemet合金的非晶前驱体可看作由2类团簇结构构成:一种为基于a-Fe(Si)有序固溶体(例如Fe_3Si相)的[Si-Fe_(14)](Cu_(1/13)Si_(12/13))_3弱稳定团簇结构;另一种为对应于Fe-B-Si-Nb系块体非晶合金的[(Si,B)-B_2(Fe,Nb)_8]Fe强稳定团簇结构。将2种团簇成分式按等比例混合,设计并制备了多个新成分合金。热分析和磁性测量结果表明,所有成分的非晶样品均显示多峰晶化特征,其中,[(Si_(0.8)B_(0.2))-B_2Fe_(7.2)Nb_(0.8)]Fe+[Si-Fe_(14)](Cu_(1/13)Si_(12/13))_3(即Fe_(74)B_(7.33)Si_(15.23)Nb_(2.67)Cu_(0.77))非晶两晶化峰的峰间距(ΔT_p=T_(p2)-T_(p1))最大,约为192 K。该非晶样品在813 K等温退火60 min后获得典型的纳米晶/非晶复相结构,其饱和磁化强度B_s约为1.26 T,矫顽力H_c约为0.5 A/m,1 k Hz下的有效磁导率m_e约为8.5×10~5。新成分纳米晶合金的综合软磁性能均优于典型成分为Fe_(73.5)Si_(13.5)B_9Cu_1Nb_3的已有Finemet纳米晶合金。
Based on the composition of Finemet alloy and the crystallization characteristics of its amorphous precursors, the “double cluster” structure model and cluster composition of Finemet alloy are proposed. That is to say, the amorphous alloy of Finemet alloy can be considered as 2 The cluster structure consists of a weakly stable [Si-Fe_ (14)] (Cu_ (1/13) Si_ (12/13)) _3 based on a-Fe (Si) ordered solid solution (eg Fe_3Si phase) (Si, B) -B_2 (Fe, Nb) _8] Fe corresponding to the bulk Fe-B-Si-Nb bulk amorphous alloy. The two kinds of cluster components were mixed in equal proportions, and a number of new compositional alloys were designed and prepared. The results of thermal analysis and magnetic measurement show that the amorphous samples of all compositions show multimodal crystallization characteristics. Among them, [(Si 0.8 B 0.2) - B 2 Fe 7.2 Nb 0.8 Fe + Si- (74) B7.33Si15.23Nb2.667Cu0.777) peaks of the (Cu1 / 13) Si12 / 13) _3 (14) The pitch (ΔT_p = T_ (p2) -T_ (p1)) is the largest, about 192K. The amorphous sample obtained a typical nanocrystalline / amorphous complex phase after isothermal annealing at 813 K for 60 min. Its saturation magnetization B_s was about 1.26 T, coercivity Hc was about 0.5 A / m, The effective permeability m_e is about 8.5 × 10 ~ 5. The new composite nanocrystalline soft magnetic properties are better than the typical composition of Fe_ (73.5) Si_ (13.5) B_9Cu_1Nb_3 existing Finemet nanocrystalline alloy.