兼具高饱和磁感应强度（Bs）和大非晶形成能力（GFA）的Fe基非晶合金的开发，对于非晶变压器和电机等节能型电力电子器件的发展具有重要意义。申请人前期的研究表明，在传统的Fe-Si-B非晶合金中添加少量的类金属元素（P和C），在获得高Bs（1.5-1.6T）的同时，合金的GFA有了大幅提高，但类金属元素添加所引起的非晶合金的微结构演化，及对其热稳定性、GFA和软磁性能的影响等关键科学问题仍然有待深入研究。本项目拟采用穆斯堡尔谱与扩展X射线吸收精细结构谱相结合的方法，研究其微观结构的形成和演变过程；利用洛伦兹电镜和电子全息技术，分别在无外加磁场和施加外磁场的情况下，对磁畴结构和畴壁运动进行实时、动态和图像化的记录与研究。通过建立Fe-Si-B系非晶合金微观结构特征与其性能之间的关联性，探索合金优异性能的微观结构起源，为今后的合金成分和处理工艺设计、及性能调控提供理论指导。

The development of Fe-based amorphous alloys with large glass forming ability (GFA) and high saturation magnetic flux density (Bs) has been one of the major research subjects in materials science and engineering field for the last several decades, owing to the expectation of saving energy and natural resources. Our previous research has concluded that the addition of metalloid element of P and C can improve the GFA drastically with maintaining the high Bs (1.5-1.6 T) in FeSiB alloy system. However, the mechanism for the formation and evolution of the microstructure with metalloid element addition is unclear yet, and further studies on the effect of metalloid element on the thermal stability, GFA and soft-magnetic properties are needed. In our project, the combined methodology of Mössbauer spectroscopy and extended X-ray absorption fine structure spectroscopy will be utilized to explore the formation and evolution of microstructure in FeSiB alloy system. Then, the Lorenz electron microscope and electron holography technology will be used to systematically investigate the magnetic domain structure and domain wall movement. Our project is expected to establish a correlation between the microstructure and properties of the FeSiB alloy system, and find the micro-structural origin of the outstanding properties in the alloys. The aim of the project is to provide a theoretical guidance for the modulation of the properties, and design of novel alloy compositions and treatment processes of the Fe-based amorphous materials.