Nanocrystallization mechanism of amorphous Fe78B13Si9

被引：18
|
作者：
Sato, K. [1 ]
Murakami, H. [1 ]
Sprengel, W. [2 ]
Schaefer, H. -E. [3 ]
Kobayashi, Y. [4 ]
机构：
[1] Tokyo Gakugei Univ, Dept Environm Sci, Tokyo 1848501, Japan
[2] Graz Univ Technol, Inst Mat Phys, A-8010 Graz, Austria
[3] Univ Stuttgart, Inst Theoret & Angew Phys, D-70550 Stuttgart, Germany
[4] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 17期
关键词：
amorphous magnetic materials; boron alloys; crystallisation; crystallites; diffusion; iron alloys; long-range order; metallic glasses; nanostructured materials; nanotechnology; nucleation; short-range order; silicon alloys; POSITRON-ANNIHILATION; ALLOY;
D O I：
10.1063/1.3126041
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 alpha-Fe nucleation. Along with the growth of alpha-Fe nucleus, Fe atoms are transferred from the intergranular amorphous phase to Fe-based nanocrystallites. The nanocrystallization of alpha-Fe is achieved through nucleation by short-range Fe diffusion and its growth by nanovoid-mediated long-range Fe diffusion.
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页数：3
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