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ＦｅＣｕＮｂＳｉＢ超微晶合金中晶化相－α－Ｆｅ（Ｓｉ）团溶体（α相）的体积份数、尺寸和成分（Ｓｉ含量）与合金中Ｎｂ含量有关。Ｎｂ含量的增加使ＦｅＣｕＮｂＳｉＢ非晶合金在最佳温度退火后。相的体积份数减少、尺寸减小及Ｓｉ含量降低。α相的体积份数、尺寸及成分（Ｓｉ含量）对合金的起始磁导率有综合影响。对应于合金获得最高起始磁导率，α相的体积份数为６４％～７０％，尺寸为９．４～１１．０ｎｍ，含Ｓｉ量约为１６～１９（ａｔ）％，此时，合金中Ｎｂ含量为３～５（ａｔ）％。
The volume fraction, size and composition (Si content) of the crystallized α-Fe-Si (α) phase in the FeCuNbSiB nanocrystalline alloy are related to the Nb content in the alloy. The increase of Nb content makes the FeCuNbSiB amorphous alloy anneal at the best temperature. The volume fraction of phase decreases, the size decreases and the Si content decreases. The volume fraction, size and composition of the α phase (Si content) have a combined effect on the initial permeability of the alloy. Corresponding to the alloy to obtain the highest initial permeability, the α phase volume fraction of 64% to 70%, the size of 9.4 ~ 11.0nm, containing Si content of about 16 ~ 19 (at)%, at this time, The content of Nb in alloy is 3 ~ 5 (at)%.