摘要
用低频脉冲磁场处理了非晶Fe78Si9B13合金,利用M ssbauer谱和LDJ9600震动样品磁强计进行了微结构和磁性分析,通过DSC曲线,借助于Kis-singer公式计算了脉冲磁场处理前后样品的纳米晶化过程激活能,探讨了铁基非晶低温纳米晶化的相变动力学机理。结果表明,用脉冲磁场处理非晶Fe78Si9B13合金的晶化激活能由处理前的433.6kJ/mol降到了200kJ/mol以下,大大提高了α-Fe(Si)的形核速率,只有α-Fe(Si)的单相纳米晶体析出,析出相的晶粒尺寸约为10nm,而且脉冲磁场处理过程中,非晶Fe78Si9B13合金试样温升均<10℃,说明脉冲磁场的处理促进了非晶合金的低温纳米晶化。
The amorphous Fe78 Si9 B13 alloy was treated by low frequency pulse magnetic field （LFPMF）. The microstructures and the magnetic properties of the untreated and the treated alloys were examined by MOssbauer spectra and LDJ9600 vibrating sample magnetometer （VSM）. the activation energy of nanocrystallization of the amorphous alloy treated by low frequency pulse magnetic field was determined by differential scanning calorimetric （DSC） profiles through Kissinger equation and the phase transformation kinetic mechanism of nanocrystallization of Fe-based amorphous alloy treated by low frequency pulse magnetic field was discussed. The results indicated that the activation energy was decreased from 433.6kJ/mol to less than 200kJ/mol after LFPMF treatment leading to the result that the nucleating rate of α-Fe（Si） was greatly increased and there was only single phase α-Fe（Si） crystalline with the 10nm size precipitated and the samples of the amorphous Fe78Si9B13 alloy were heated at a rate of less than 10K/min in the course of magneto-pulsing, indicting that the low frequency pulse magnetic field can promote nanocrystallization of Fe-based amorphous alloy at a relatively low temperature.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第2期216-218,共3页
Journal of Functional Materials
基金
高等学校博士学科点专项科研基金资助课题(20020145009)
关键词
低频脉冲磁场
非晶合金
纳米晶化
相变动力学
low frequency pulse magnetic field
amorphous alloy
nanoerystallization
phase transformation kinetic mechanism
