Fe-Nb-B纳米晶合金的结构与磁性

利用X射线衍射,差热分析及静态磁性测量,研究了退火温度对不同成分的非晶Fe Nb B合金纳米晶化行为和磁性的影响·实验发现:在纳米晶化过程的初期出现磁硬化,矫顽力与最大磁导率均呈现不同程度的恶化·在硼化物(Fe2B和Fe3B)相析出前,具有纳米结构的合金由α Fe固溶体和非晶基体相组成,呈现较佳的软磁特性·随纳米晶相体积分数增加而呈现的磁软化现象可解释为由于纳米晶粒间距的减少,交换耦合增强所致·

Structure and Magnetic Properties of Nanocrystalline Fe-Nb-B Alloys

The effects of annealing temperature on nanocrystallization behavior and magnetic properties of amorphous Fe-Nb-B alloys were investigated by X-ray diffraction, differential scanning calorimeter and static magnetism measurement. It is found in experiment that the magnetic hardening takes place somewhat at the beginning of nanocrystallization process, which is manifested differently by the deterioration of coercive force and maximum permeability. The softer magnetic behavior features the alloys, of which the nanocrystallization structure is composed of α-Fe solid solution and amorphous matrix just before the precipitation of borides (e. g. Fe2B and Fe3B). The magnetic softening was observed increasing with the increase of the volume fraction of nanocrystallization phase, which can be explained by the reason that the decrease in the distance between nanocrystals will result in stronger exchange coupling.