Soft magnetic metal amorphous nanocomposite alloys are produced through rapid solidification and thermal annealing yielding nanocrystals embedded within an amorphous precursor. Similar free energies in Co-rich and FeNi-based alloy systems result in multiple nanocrystalline phases being formed during devitrification. Studies of multi-phase crystallization processes have been reported for Co-rich alloys but relatively few have investigated FeNi-based systems. A detailed characterization of compositional partitioning and microstructure of an optimally annealed FeNi-based MANC (Fe70Ni30)80Nb4Si2B14 alloy is presented through complementary high-resolution transmission electron microscopy (HRTEM) and atom probe tomography (APT). HRTEM demonstrates orientation relationships between FCC and BCC nanocrystals, suggesting heterogeneous nucleation of nanocrystals in the amorphous matrix or a cooperative mechanism of nucleation between BCC and FCC nanocrystallites. APT results show evidence for (i) the segregation of Fe and Ni between nanocrystals of different phases, (ii) B partitioning to the amorphous phase, and (iii) an Nb-enriched shell surrounding nanocrystals.

通过快速凝固和热退火产生软磁性金属非晶态纳米复合合金，从而产生嵌入非晶态前体中的纳米晶体。富钴和FeNi基合金系统中类似的自由能导致在失透过程中形成多个纳米晶相。已经报道了富钴合金的多相结晶过程的研究，但是很少有人研究基于FeNi的系统。最佳退火FeNi基MANC（Fe 70 Ni 30）80 Nb 4 Si 2 B 14的成分分配和微观结构的详细表征通过互补的高分辨率透射电子显微镜（HRTEM）和原子探针层析成像（APT）展示了这种合金。HRTEM证明了FCC和BCC纳米晶体之间的取向关系，表明非晶态基质中纳米晶体的异质成核或BCC和FCC纳米晶体之间成核的协同机制。APT结果显示出以下证据：（i）不同相的纳米晶体之间Fe和Ni的偏析；（ii）B分配为非晶相；以及（iii）纳米晶体周围富集Nb的壳。