高饱和磁感应强度软磁性钴基块体非晶合金的制备及其性能调控研究

软磁性Co基非晶合金具有低矫顽力、高磁导率、低铁损、接近零的磁致伸缩系数等极其优异的软磁特性，有着重要的工业应用价值。但有关其新合金体系研发以及相关理论研究的工作很少。本项目针对Co基非晶合金饱和磁感应强度（Bs）不高及非晶形成能力（GFA）低的不足，以发展高Bs的优异软磁性Co基块体非晶合金为目标，系统研究（Fe，Ni，Mn）和（P，C，Si）两组相似元素、微量稀土和过渡金属元素的添加对高Co浓度Co-B二元合金的热稳定性、GFA及磁性能的影响规律，建立合金成分与GFA及磁性能的相关性。研究合金元素对其微观结构演变的影响规律，探讨成分—微观结构—GFA及磁性能间的关联，在原子层面理解合金元素的作用机理，阐明其对GFA和磁性能的微观调控机制。通过合金成分优化，综合调控合金的性能，制备出具有高Bs（> 1.1 T）Co基块体非晶合金，为发展新型优异软磁性能的Co基非晶合金提供实验和理论依据。

The excellent soft magnetic properties of Co-based metallic glasses including low coercivity, high permeability, low core loss, and nearly zero magnetostriction coefficient, are of significant technical value. The practical applications of Co-based metallic glasses are limited by the low saturation magnetization (Bs) and weak glass-forming ability (GFA). Less experimental investigations have been carried out, and few theoretical guidelines are known, for the development of new types of Co-based metallic glasses with excellent soft-magnetic properties. This proposal is devoted to developing soft magnetic Co-based bulk metallic glasses (BMGs) with high Bs along with the relevant theoretical guidelines. Our experimental study is focusing on the alloying substitution effects of two groups of like-elements, (Fe, Ni or Mn) and (P, C or Si), and the minor alloying effects of rare earth and transition metal elements on the thermal stability, GFA, as well as the magnetic properties of binary Co-B alloys with high Co concentrations. Thereupon the experimental evidence is used to establish the relationship between the alloy composition, GFA, and magnetic properties. A local atomic structure model is put forth to understand the alloying effects on the microstructural evolution, and to elaborate the correlation between the composition, microstructure, GFA, and magnetic properties of the new type of Co-based BMGs, and then to clarify the microcosmic mechanism for tailoring the GFA and magnetic properties. Finally, Co-based BMGs with Bs > 1.1 T are to be obtained by composition optimization along with properties tailoring, and useful theoretical guidelines are to be proposed for the development of new Co-BMGs with excellent magnetic properties.