Co51Fe18Nb6Si15B10纳米晶合金磁导率与温度的关系

采用Hopkinson效应分析方法和X射线衍射技术,研究了退火温度对非晶Co51Fe18Nb6Si15B10合金初始磁导率μi与温度的关系及微观结构的影响.实验发现:μi-t曲线的变化呈现四种类型:Hopkinson峰、圆滑峰、长尾特征和单调上升特征;微观结构的转变可分为三个阶段.根据单相非晶合金和双相纳米晶合金在升温过程磁性参量的变化,讨论了α-Fe(Co)纳米晶相的体积分数,剩余非晶相及纳米晶粒间的铁磁交换耦合对初始磁导率与温度关系的影响

Temperature Dependence of Permeability of Nanocrystalline Alloy Co51Fe18Nb6Si15B10

The effect of annealing temperature on the temperature dependence of initial permeability μi and microstructure of the amorphous alloy Co51Fe18 Nb6Si15B10 was analyzed through Hopkinson effect and X-ray diffraction. It was found that the μi-t curves present in four types including the Hopkinson peak, smooth peak, long tail and monotonous rising, with all measurements of initial permeability conducted during heating. The microstructural transformation could be divided into three phases. According to the change of magnetic parameters in the temperature rising processes of the single-phase amorphous alloy and dual-phase nanocrystalline alloy, the influences of the volume fraction of α/-Fe(Co) nanocrystalline phase, the residual amorphous phase and the magnetic exchange coupling between nanocrystalline grains on the temperature dependence of initial permeability were also discussed.