摘要
高强脉冲电流能使Fe基非晶合金在低于非晶转变温度70~100K的条件下实现快速晶化。脉冲频率和处理时间对Fe基非晶合金晶化过程有显著影响。在高强脉冲电流的作用下,随着处理时间的增加,Fe基非晶合金先发生结构弛豫,然后在某一临界处理时间之后发生快速晶化,析出大量的α-Fe(Si)纳米相,最后晶化过程趋于稳定。提高脉冲频率f,可以有效缩短临界处理时间,但不改变Fe基非晶合金纳米晶化过程中显微硬度的变化趋势。与等温退火工艺相比,高强脉冲电流处理是一种高效的非晶合金快速晶化方法。
It has been found that Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons can be rapidly nanocrystallized by high-density pulsing current at a temperature of 70~100 K lower than the glass transition temperature. The pulsing frequency and processing time have significant effects on the nanocrystallization of the studied amorphous alloy. Under the action of high-density pulsing current, the structural relaxation is induced firstly, and then the precipitation of abundant α-Fe(Si) nanocrystals occurs at a certain critical processing time. Moreover, the critical processing time can be evidently reduced by increasing the pulsing frequency. It shows that high-density pulsing current is an effective way for rapid nanocrystallization of the studied amorphous alloy, comparing with the isothermal annealing.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A04期687-690,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金委员会(50431030和50671050)
国家基础研究项目(2007CB613905)资助
关键词
脉冲电流
FE基非晶合金
纳米晶化
显微组织
pulsing current Fe-based amorphous alloy nanocrystallization microstructure