Soft magnetic materials play a crucial role in determining the efficient operation of power electronics and electrical machines. Recently, compositionally complex alloys have shown to offer promising magnetic properties that can be engineered by composition and microstructure. In this work, we investigate the microstructures and physical properties of novel dual-phase Fe-Co-Ti-Ge alloys by introducing ferromagnetic Heusler-type phases into a disordered ferromagnetic matrix. The microstructure of three alloys is studied in the as-cast and homogenized state and is primarily composed of a Fe-Co BCC-A2 matrix phase and Fe-Co-Ti-Ge-based L2₁-ordered Heusler phases. A Ti-Ge-rich phase is observed to form in the Fe₅₀Co₂₀Ti₁₀Ge₂₀ (at. %) alloy. The physical and magnetic properties of these alloys show a good combination of high electrical resistivity (202 – 252 µΩ‧cm), high Curie temperature (> 1000 K), moderate saturation magnetization (74 – 99 A‧m²/kg) and coercivity (390 – 1099 A/m). The phase arrangement, morphology and composition of the BCC-A2 and L2₁-Heusler phases are responsible for the observed differences in magnetic properties, which can be further tuned by tailoring the microstructure.

软磁材料在决定电力电子和电机的高效运行方面起着至关重要的作用。最近，成分复杂的合金已显示出可以通过成分和微观结构设计的有前途的磁性。在这项工作中，我们通过将铁磁赫斯勒型相引入无序铁磁基体来研究新型双相 Fe-Co-Ti-Ge 合金的微观结构和物理性能。研究了三种合金在铸态和均匀化状态下的微观结构，主要由 Fe-Co BCC-A2 基体相和基于 Fe-Co-Ti-Ge 的 L2 1 有序赫斯勒相_组成。观察到在 Fe ₅₀ Co ₂₀ Ti ₁₀ Ge中形成富 Ti-Ge 相₂₀ (at. %) 合金。这些合金的物理和磁性表现出高电阻率（202 – 252 µΩ‧cm）、高居里温度（> 1000 K）、 中等饱和磁化强度（74 – 99  A‧m ² /kg）和矫顽力的良好组合（390 – 1099 安/米）。_{BCC-A2 和 L2 1} -Heusler 相的相排列、形态和组成是观察到的磁性能差异的原因，可以通过定制微观结构进一步调整这些差异。