纵向磁场退火处理对Fe_(73.7)Si_(15.3)Cu_(1)Nb_(3)B_(7)合金组织结构和性能的影响

Effect of longitudinal magnetic field annealing on microstructure and properties of Fe_(73.7)Si_(15.3)Cu_(1)Nb_(3)B_(7)alloy

研究了纵向磁场不同温度退火处理对组成为Fe_(73.7)Si_(15.3)Cu_(1)Nb_(3)B_(7)的1k107B纳米晶合金带材的组织结构和软磁性能的影响。结果表明:在纵向加磁电流为150 A、退火温度区间为525~595℃时,合金的矩形比均在0.97以上,晶粒尺寸(D)和矫顽力(H_(c))小幅度增加,最大磁导率(μ_(m))则与之相反,损耗(P_(s))在575℃时取得最小值(99 W/kg@50 kHz,0.4 T);有效磁导率(μ_(e))随着退火温度的升高呈先增加后减小的趋势;通过磁光克尔显微镜观察到纵向磁场退火后合金内部形成规则的平行于磁场方向的条纹畴,且随着退火温度的升高磁畴壁厚度逐渐增大。

Effect of annealing at different temperatures with longitudinal magnetic field on microstructure and soft magnetic properties of 1k107B nanocrystalline alloy strips with the composition of Fe_(73.7)Si_(15.3)Cu_(1)Nb_(3)B_(7)was studied.The results show that when the longitudinal magnetizing current is 150 A and the annealing temperature range is 525-595℃,the rectangular ratio B_(r)/B_(s) of the alloy is more than 0.97,the grain size(D)and coercivity(H_(c))increase slightly,while the maximum permeability(μ_(m))is the opposite,and the core loss(P_(s))reaches the minimum value(99 W/kg@50 kHz,0.4 T)at 575℃.The effective magnetic permeability(μ_(e))first increases and then decreases with the increase of annealing temperature.The observation of magneto-optical Kerr microscopy shows that the regular stripe domains parallel to the magnetic field direction are formed in the alloy after longitudinal magnetic field annealing,and the domain wall thickness gradually increases with the increase of annealing temperature.