The effect of Cu content on amorphous forming ability (AFA), crystallization behavior and soft magnetic properties of the new Si-free Fe_84-xB₉P₃C₄Cu_x (x = 0.7, 0.9, 1.1, 1.3 and 1.5) alloys were systematically investigated. The phase structure identified by XRD reveals that the alloys for Cu content less than 1.3 at. % have good AFA. The dependence of activation energies of nucleation and growth on Cu content shows that the growth of α-Fe grains is more difficult than the nucleation for the alloy ribbons with Cu ≤ 1.1 at. %, which is beneficial to obtain finer nanocrystalline α-Fe grains during crystallization annealing, while for those with Cu > 1.1 at. %, the growth of α-Fe grains is easier than the nucleation. The relationship between coercivity (H_c) and the annealing temperature (T_a) indicates that appropriate Cu content is beneficial to improve the stability of soft magnetic properties, especially, when annealed near the temperature of the first crystallization peak. The nanocrystalline Fe_82.9B₉P₃C₄Cu_1.1 alloy exhibits a high saturation magnetic flux density of 1.84 T ~ 1.85 T and a low H_c of 13.0 A/m ~ 8.9 A/m annealed in the range of 703 K ~ 763 K.

Cu含量对新型无硅Fe _{84- x} B ₉ P ₃ C ₄ Cu _x（x的非晶形成能力（AFA），结晶行为和软磁性能的影响 分别对= 0.7、0.9、1.1、1.3和1.5）合金进行了研究。XRD鉴定的相结构表明，该合金的Cu含量小于1.3 at。％的人拥有良好的AFA。形核和生长的活化能对Cu含量的依赖性表明，对于Cu≤1.1 at的合金薄带，α-Fe晶粒的生长比形核更困难。％，这有利于在结晶退火期间获得更细的纳米晶α-Fe晶粒，而对于Cu＞ 1.1at。％的晶粒。％，α-Fe晶粒的生长比成核容易。矫顽力（H _c）与退火温度（T _a）之间的关系）表明适当的Cu含量有利于改善软磁性能的稳定性，特别是当在第一个结晶峰的温度附近退火时。纳米晶Fe _82.9 B ₉ P ₃ C ₄ Cu _1.1合金的高饱和磁通密度为1.84 T〜1.85 T，退火后的H _c为13.0 A / m〜8.9 A / m，在703 K〜763范围内退火K.