中文摘要：

研究了Fe76-xC7.0Si3.3B5.0P8.7Cux（x=0、0.3%或0.7%（原子分数））非晶合金中Cu的添加及纳米晶的形成对其软磁性能的影响,对合金的微观结构进行了X射线衍射实验和高分辨透射电镜观察,对合金的热稳定性和晶化激活能进行了测量和分析。结果表明,该合金退火之后的饱和磁化强度与合金中α-Fe纳米晶粒的密度和大小密切相关。Cu的添加可以影响合金的非晶形成能力、热稳定性和晶化激活能,添加少量的Cu（少于0.3%（原子分数））可以有效地提高合金的非晶形成能力,抑制退火过程中α-Fe纳米晶粒的析出,增强合金的热稳定性,而当Cu的添加量达到0.7%（原子分数）时可以降低合金的晶化激活能,促进α-Fe纳米晶粒的形核,提高α-Fe纳米晶粒的密度,使合金的饱和磁化强度达到1.79T。

英文摘要：

Nanocrystallization kinetics of the α-Fe phase and its effects on the soft magnetic properties of the Fe76-xC7.0Si3.3B5.0P8.7Cux（x=0,0.3% and 0.7at%） amorphous alloys have been investigated in detail.It was found that a small amount of Cu additions（less than 0.3%） can suppress precipitation of the α-Fe nanocrystals and then enhance the thermal stability,whilst proper Cu additions（e.g.,0.7%） can stimulate the α-Fe nucleation due to a reduced activation energy for crystallization.The saturation magnetization of the annealed samples was closely associated with the characteristics（i.e.,size and density） of the precipitated α-Fe nanocrystals.With proper annealing conditions,a large saturation magnetization value of 1.79T was achieved in the alloy with 0.7% Cu additions due to strong ferromagnetic exchange coupling between the α-Fe nanocrystals and the amorphous matrix.