交流磁场处理对Fe78Si9B13非晶合金结构和性能影响的研究

利用X射线衍射仪(XRD)、振动样品磁强计(VSM)和差示扫描量热仪(DSC)对交流磁场处理前后Fe78Si9B13非晶合金条带的结构和性能进行了分析研究。XRD和VSM结果显示，随着交流电流的增大，合金的近邻原子间距离(d)和矫顽力(Hc)先减小后增大，但饱和磁感应强度则随交变电流的增大而变化幅度不大。d和Hc的变化是由合金中不均匀特征结构在结构磁驰豫过程中的相互作用所导致。由DSC曲线计算获得的表观激活能、局域激活能和局域Avrami指数显示，交流磁场处理提高了合金的初始晶化激活能和晶化反应的Avrami指数，降低了晶化反应的表观生长激活能。合金晶化行为的改变与磁后效导致的团簇原子对有序以及溶质原子与自由体积的扩散有关。

Effect of AC field magnetic treatment on the microstructure and magnetic properties of Fe78Si9B13 amorphous alloy

The as-quenched (AQ) and after alternating current magnetic field (ACMF) treatment Fe78Si9B13 amorphous ribbons have investigated by XRD, DSC and VSM. The XRD and VSM results show that the nearest neighbor distance (d) and coercivity (Hc) of the ACMF treatment samples first decrease and then increase with increasing alternating current, however, the saturation magnetization varies little with the alternating current. The changes of d and Hc are attributing to the interaction of inhomogeneous characteristics structures in present alloys in the structural magnetic relaxation process. The apparent activity energies, local activity energies and local Avrami exponents of AQ and ACMF treatment samples deduced from DSC curves show that ACMF treatment increased the onset crystallization activity energy and local Avrami exponent and decrease the apparent growth activity energy of the crystallization reactions. The changes of crystallization behavior are ascribe to atomic pair ordering in atomic clusters and diffusion of free volume resulted by the magnetic aftereffect.