Precipitation strengthening is an effective approach to enhance the strength of soft magnetic alloys for applications at high temperatures, while inevitably results in deterioration in coercivity due to the pinning effect on the domain wall movement. Here, we realize a good combination of high-temperature strength and ductility (ultimate tensile strength of 564 MPa and elongation of $\sim$ 20 %, respectively) as well as low coercivity (6.97 Oe) of FeCo-2V-0.3Cr-0.2Mo soft magnetic alloy through introducing high-density magnetic nanoprecipitates. The magnetic nanoprecipitates are characterized by FeCo-based phase with disordered body-centered cubic structure, which enables the alloy to have a low coercivity. In addition, these nanoprecipitates can impede the dislocation motion and suppress the brittle fracture, which lead to a high tensile strength and ductility. This work provides a guideline to enhance strength and ductility while maintaining low coercivity in soft magnetic alloys via magnetic nanoprecipitates.

析出强化是一种提高软磁性合金在高温下强度的有效方法，同时由于对畴壁运动的钉扎效应而不可避免地导致矫顽力降低。在这里，我们实现了高温强度和延展性的最佳组合（最终抗拉强度为564 MPa，延伸率为$〜$通过引入高密度磁性纳米沉淀，FeCo-2V-0.3Cr-0.2Mo软磁合金的矫顽力分别为20％和低矫顽力（6.97 Oe）。磁性纳米沉淀物的特征在于具有无序的体心立方结构的FeCo基相，这使合金具有低矫顽力。另外，这些纳米沉淀物可阻碍位错运动并抑制脆性断裂，这导致高的拉伸强度和延展性。这项工作为增强强度和延展性提供了指导，同时通过磁性纳米沉淀物在软磁合金中保持低矫顽力。