非晶Fe_(78)Si_9B_(13)在脉冲磁场作用下纳米晶化及物理机理

The Nano-Crystallization and Physical Mechanism of Amorphous Fe_(78)Si_9B_(13) by the Pulse Magnetic Field Treatment

采用TEM和穆斯堡尔谱技术,研究了非晶合金Fe78Si9B13晶化的结构与脉冲磁场强度的关系,并对低频脉冲磁场致非晶合金纳米晶化的物理机制进行了理论研讨。一定频率下的脉冲磁场,将使非晶合金磁致伸缩的能量降低非晶合金的形核势垒,从而使非晶合金得以晶化。实验对非晶合金Fe78Si9B13进行了两种脉冲磁场处理:脉冲频率固定,磁场强度不断增加;磁场强度固定,脉冲频率不断增加。结果表明,低频脉冲磁场处理可使非晶合金Fe78Si9B13发生纳米晶化;晶化量与磁场强度不呈线性关系,而是存在一极值的曲线分布。

It adopted Mssbauer spectrum technology with sensitivity for chemical circumference and investigated relationship of crystallized structures of amorphous Fe78Si9B13 with pulse magnetic filed, and it undertook theoretical analysis on physical mechanism that lower frequency pulse magnetic filed caused nano-crystallization of amorphous alloy on physical mechanism. Pulse magnetic filed caused magnetostriction in pulse frequency constant, the energy of magnetostriction brought down formation nucleus potential base and caused the nanocrystallization of amorphous alloy. Amorphous Fe78Si9B13 had been treated by pulse magnetic field for two mechanisms. The treatment conditions were: keeping pulse frequency constant, the magnetic field intensity uninterrupted increases; the magnetic field intensity constant, the pulse frequency uninterrupted increases. The results show that the treatment causes the nano-crystallization by pulse magnetic field and there is not linear relationship between the crystallized quantity and magnetic field.