The effect of Cu content on GFA, crystallization behavior, and soft magnetic properties in high P Fe_84+xB₆P₆C₃Cu_1−x (x = 0, 0.2, 0.4, 0.6, and 1.0 at. %) alloy ribbons were systematically investigated to balance the relationship between glass forming ability (GFA), heat treatment window, and soft magnetic properties of high saturation magnetic flux density (B_s) Fe-based nanocrystalline alloys. It was discovered that lowering Cu promotes the formation of an amorphous structure. The GFA of alloys rises from 23 μm for Fe₈₄B₆P₆C₃Cu₁ to 29 μm for Fe_84.4B₆P₆C₃Cu_0.6. Analysis of thermal physical properties shows that when Cu content is between 1.0 at. % and 0.6 at. %, reducing Cu in the alloys does not affect the onset temperature of the first crystallization peak (T_x1), the second one (T_x2), and ΔT (ΔT = T_x2 − T_x1), whereas when Cu content is less than 0.6 at. %, reducing Cu leads to an increase in T_x1 and a decrease in T_x2 and ΔT, which is not conducive to obtaining a wide temperature range of precipitation of a single α-Fe phase. The alloys have a wide range of crystallization annealing temperature (693–753 K) and annealing time (60–6 min) to obtain a low coercivity (H_c) of about 8.0 A/m, high B_s of about 1.80 T, and high effective magnetic permeability (μ_e) of about 10000 when Cu is between 1.0 at. % and 0.6 at. %. The B_s, H_c, and μ_e of Fe_84.4B₆P₆C₃Cu_0.6 alloy annealed at 723 K for 30 min are 1.82 T, 8.1 A/m, and 10820, respectively.

_{Cu含量对高P Fe 84+x} B ₆ P ₆ C ₃ Cu _1−x (x = 0, 0.2, 0.4, 0.6, and 1.0 at. %)合金的GFA、结晶行为和软磁性能的影响为了平衡高饱和磁通密度 ( Bs ) 铁基纳米晶合金_{的玻璃形成能力 (GFA)、热处理窗口和软磁性能之间的关系，系统地研究了碳带。}发现降低Cu促进了非晶结构的形成。_{Fe 84} B ₆ P ₆ C ₃ Cu ₁合金的 GFA 从 23 μm 上升_{Fe 84.4} B ₆ P ₆ C ₃ Cu _0.6为 29 μm 。热物性分析表明，当Cu含量在1.0at之间时。% 和 0.6 在。%，减少合金中的Cu不影响第一个结晶峰（Tx1）、第二个结晶峰（ _Tx2  ） 和ΔT（ΔT  =  Tx2 - _{Tx1 ）的起始}温度，而当_Cu含量为小于 0.6 at。%，减少 Cu 导致T _x1增加和T _x2和 Δ T减少，这不利于获得单个α-Fe相析出的宽温度范围。该合金具有宽范围的结晶退火温度 (693–753 K) 和退火时间 (60–6 min) 以获得约 8.0 A/m的低矫顽力 ( H _{c )、约 1.80 T 的高}B _s和当 Cu 在 1.0 at 之间时，高有效磁导率 ( μ _e ) 约为 10000。% 和 0.6 在。%。Fe _84.4 B ₆ P ₆ C ₃ Cu _0.6的B _s、H _c和μ _e在 723 K 退火 30 分钟的合金分别为 1.82 T、8.1 A/m 和 10820。