In this paper, the growth of dendrites and its effect on soft magnetic properties of Fe₇₈Si₁₃B₉ alloy during solidification under the effect of 0.18 T oriented magnetic field are studied. It shows that the magnetic field has strong guiding and promoting effect on the growth of dendrites. The primary branches of the α-Fe (Si) phase dendrites grow in parallel along the vertical direction of the magnetic field line, and the length of the primary branches reaches more than 1 mm. At the same time, the secondary branches of the α-Fe (Si) phase dendrites also follow the direction of the magnetic field line. It grows directional parallel to the direction of the magnetic field line, and connects the adjacent primary branches to form a grid-like magnetically guided solidification structure with uniform spacing; The soft magnetic properties of the magnetically guided solidified(MGSed) FeSiB alloy are much better than the non-magnetically guided solidified(NGSed) FeSiB alloy, and the maximum permeability (μ_m) of MGSed FeSiB alloy is as high as 964.4789, which is twice as much as that of NGSed alloys. MGSed alloys have better resistance to magnetic field saturation, and their saturated magnetic field Hj value reaches 12,000 Oe, which is more than 3 times that of NGSed alloys. This work provides a novel route for further development of FeSiB alloys with excellent soft magnetism.

本文研究了枝晶的生长及其对 Fe ₇₈ Si ₁₃ B ₉软磁性能的影响研究了合金在 0.18 T 取向磁场作用下的凝固过程。说明磁场对枝晶的生长有很强的引导和促进作用。α-Fe(Si)相枝晶的初级分支沿磁力线垂直方向平行生长，初级分支长度达到1mm以上。同时，α-Fe(Si)相枝晶的次级分支也遵循磁场线的方向。平行于磁场线方向生长，并连接相邻的初级分支，形成间距均匀的网格状磁导凝固结构；_m ) MGSed FeSiB 合金高达 964.4789，是 NGSed 合金的两倍。MGSed合金具有更好的抗磁场饱和能力，其饱和磁场Hj值达到12000 Oe，是NGSed合金的3倍以上。这项工作为进一步开发具有优异软磁性的 FeSiB 合金提供了一条新途径。