稀土掺杂Fe基非晶合金的微观结构调控及其对磁致伸缩效应的影响机制

项目名称： 稀土掺杂Fe基非晶合金的微观结构调控及其对磁致伸缩效应的影响机制

项目编号： No.51501210

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 黎嘉威

作者单位： 中国科学院宁波材料技术与工程研究所

项目金额： 25万元

中文摘要： Fe基非晶合金具有优异的软磁性能和高的磁弹性耦合系数，在磁性传感器领域有着广阔的应用前景。影响磁性传感器信号输出的关键因素之一是磁致伸缩效应，但目前有关非晶合金磁致伸缩效应的微观机理研究，主要集中于唯象理论的探讨，其与微观结构的关联性和调控机制尚不明晰。本项目基于申请人在Fe-Dy-B(Si)-Nb非晶合金体系中发现的异常玻璃转变行为，及其与结构非均匀性和大磁致伸缩效应的对应关系，拟通过稀土掺杂、热处理等方法调控合金的异常玻璃转变行为，研究微观结构演化与磁致伸缩效应的关联规律；通过表征不同磁致伸缩合金的径向分布函数，以及“类液体区”在不同磁场下的尺寸、体积分数、分布密度等，研究微观结构非均匀性的分布特征和演化规律。以微观结构和磁畴结构的演变为桥梁，揭示非晶合金的微观结构非均匀性对磁致伸缩效应的影响机制，为调控Fe基非晶合金的磁致伸缩效应、以及优化非晶合金的软磁性能提供新思路。

中文关键词： 铁基非晶合金；磁致伸缩；非均匀性；类液体区

英文摘要： Fe-based amorphous alloys have a broad range of applications in the field of magnetic sensors due to their excellent soft magnetic properties and high magnetoelastic coupling coefficients. Magnetostrictive effect is one of the key factors to export the magnetic conversion signal into a magnetic sensor. However, the studies on the microscopic mechanism of the magnetostriction in amorphous alloys are usually limited to the phenomenological theory. Therefore, the correlation between microstructure and magnetostriction in amorphous alloys and their modification mechanism are still unclear. This project aims to modify the abnormal glass transition behavior of Fe-Dy-B(Si)-Nb amorphous alloy system by doping rare earth elements (RE) and subsequent heat treatment. The influence of microstructure evolution on magnetostrictive effect will then be investigated. Furthermore, the radial distribution functions of different magnetostrictive alloys, the size, volume fraction, and density of liquid-like region under different magnetic fields will be analyzed, in order to monitor the microstructure evolution. Finally, the relationship between microstructure and magnetostrictive effect in these amorphous alloys will be elucidated by analyzing the magnetic domain structure. In conclusion, our project is expected to provide a new insight into the improvement of magnetostriction and soft magnetic properties of Fe-based amorphous alloys.

英文关键词： Fe-based amorphous alloys;Magnetostriction;Heterogeneity;Liquid-like region