Nanocrystallization mechanism of amorphous Fe78B13Si9

Sato, K.; Murakami, H.; Sprengel, W.; Schaefer, H.-E.; Kobayashi, Y.
April 2009
Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p171904
Academic Journal
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.


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