Nanocrystallization mechanism of amorphous Fe78B13Si9
Nanocrystallization mechanism of amorphous Fe78B13Si9
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DOI：
10.1063/1.3126041
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发表时间：
2009-04
影响因子：
4
通讯作者：
Kiminori Sato;H. Murakami;W. Sprengel;H. Schaefer;Y. Kobayashi
中科院分区：
文献类型：
--
作者：
Kiminori Sato;H. Murakami;W. Sprengel;H. Schaefer;Y. Kobayashi
基于Fe_（78）B_（13）Si_（9）中纳米空位的动力学，讨论了非晶合金的纳米化机理。在非晶基体中已经存在高浓度的具有开放纳米空间的富铁波动位点。随着温度的升高，亚稳非晶基体中的结构和成分波动有助于Fe的瞬时短程扩散，从而引发高浓度的α-Fe形核。沿着α-Fe晶核的长大，Fe原子从晶间非晶相向Fe基纳米晶相转移。α-Fe的纳米化是通过Fe的短程扩散成核和Fe的长程扩散生长来实现的。
The nanocrystallization mechanism of an amorphous alloy is discussed based on the kinetics of open nanospaces in Fe78B13Si9. There already exists a high concentration of Fe-enriched fluctuated sites with open nanospaces in the amorphous matrix. The structural and compositional fluctuation helps transient short-range Fe diffusion in the metastable amorphous matrix with an increase of temperature, triggering highly concentrated α-Fe nucleation. Along with the growth of α-Fe nucleus, Fe atoms are transferred from the intergranular amorphous phase to Fe-based nanocrystallites. The nanocrystallization of α-Fe is achieved through nucleation by short-range Fe diffusion and its growth by nanovoid-mediated long-range Fe diffusion.