Crystallization kinetics of amorphous Sm8Fe85Si2C5 alloy

Citation
Xy. Zhang et al., Crystallization kinetics of amorphous Sm8Fe85Si2C5 alloy, J APPL PHYS, 89(1), 2001, pp. 496-499
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
0021-8979 → ACNP
Volume
89
Issue
1
Year of publication
2001
Pages
496 - 499
Database
ISI
SICI code
0021-8979(20010101)89:1<496:CKOASA>2.0.ZU;2-R
Abstract
The crystallization kinetics of amorphous Sm8Fe85Si2C5 alloy has been inves tigated. As the alloy is heated to 900 degreesC, the crystalline phases of the alloy are composed of alpha -Fe phase and Sm-2(Fe, Si)(17)C-x. At the b eginning of crystallization the activation energy of the alpha -Fe phase is about 425 kJ/mol, it remains relatively constant as the crystallized fract ion of the alpha -Fe phase is below 70%, and then it declines with increasi ng the crystallized fraction. When the crystallized fraction of the Sm-2(Fe , Si)(17)C-x is below 50%, the activation energy of crystallization of the phase remains between 518 and 530 kJ/mol, and then decreases with the cryst allized fraction. The crystallization behavior of the alpha -Fe phase and S m-2(Fe, Si)(17)C-x essentially results in the formation of an alpha -Fe/Sm- 2(Fe, Si)(17)C-x composite microstructure with a coarse grain size in annea led Sm8Fe85Si2C5 alloy, which is attributed to a difficult nucleation and a n easy growth for both the alpha -Fe phase and Sm-2(Fe, Si)(17)C-x in the a lloy. Cu and Nb can be used to change the crystallization behavior of the a lpha -Fe phase in the amorphous Sm8Fe85Si2C5 alloy, which is helpful to the formation of the alpha -Fe/Sm-2(Fe, Si)(17)C-x nanocomposite microstructur e with a fine grain size for the alpha -Fe phase in the alloy. (C) 2001 Ame rican Institute of Physics.