本发明涉及本发明涉及一种晶化窗口宽、软磁性能可控的铁基纳米晶合金，其分子式为：Fe_aCo_bSi_cB_dP_xCu_y，其中a、b、c、d、x、y为原子百分比，60≤a≤85，0≤b≤20，0≤c≤6，5≤d≤10，5≤x＜8，1.7≤y≤2.5，a+b+c+d+x+y＝100，且2.5≤x∶y≤4.5；与现有技术相比，本发明的优点在于该合金不仅兼具较好的非晶形成能力、综合软磁性能优异且可控的优点，而且热稳定性高，适合的退火温区达120℃，保温时间达90分钟，具有工业化推广前景。

The present invention relates to an iron-based nanocrystalline alloy with a wide crystallization window and controllable soft magnetic properties. Its molecular formula is: Fe_aCo_bSi_cB_dP_xCu_y, where a, b, c, d, x, and y are atomic percentages, 60≤a ≤85, 0≤b≤20, 0≤c≤6, 5≤d≤10, 5≤x＜8, 1.7≤y≤2.5, a+b+c+d+x+y=100, and 2.5≤ x:y≤4.5; Compared with the current technology, the advantage of the present invention is that the alloy not only has the advantages of good amorphous forming ability, excellent and controllable comprehensive soft magnetic properties, but also high thermal stability. The annealing temperature zone is up to 120°C, and the annealing time is up to 90 minutes, which has the prospect of industrialization.