Abstract: The present invention provides an iron-based amorphous/nanocrystalline alloy as shown in formula Fe(100-a-b-c-d-e)BaSibPcCdCue, wherein d+(b/c)=0.85-1.3, and a viscosity coefficient n is (3.0-8.0)*10?3 Pa/s. The present application further provides a preparation method for the iron-based amorphous/nanocrystalline alloy. According to the present application, the dynamic viscosity coefficient n is regulated by means of a change in the content of the elements in the alloy, such that the control range of viscosity of molten steel is ensured, the molten steel has higher purity, and the continuity of casting and the surface quality of a strip are guaranteed.

Abstract: The specification relates to the technical field of magnetic materials, in particular to an Fe-based amorphous nanocrystalline alloy and a preparation method thereof. The Fe-based amorphous nanocrystalline alloy comprises elements, the atomic percentages of which are as shown by the formula Fe(100-a-b-c-d-e-f)BaSibPcCdCueNbf, wherein 8?a?12, 0.2?b?6, 2.0?c?6.0, 0.5?d?4, 0.6?e?1.3, 0.6?f?0.9, and 1?e/f?1.4. The Fe-based amorphous nanocrystalline alloy has good magnetic properties, excellent thermal properties and a wide crystallization temperature zone, thus being suitable for industrial production.