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HomeMaterials Science ForumMaterials Science Forum Vol. 688Non—Isothermal Differential Scanning Calorimetry...

Non—Isothermal Differential Scanning Calorimetry Studies on Nanocrystallization Kinetics of Fe₈₁Si_3.5B_13.5C₂ Amorphous Alloy

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Abstract:

The nanocrystallization kinetics of the Fe₈₁Si_3.5B_13.5C₂ amorphous alloy was investigated by differential scanning calorimetry (DSC). The apparent activation energy E_a, as well as the nucleation and growth kinetic parameters has been calculated by Kissinger and Ozawa methods. The changeable activation energy E_a with crystalline fraction α was obtained by the expended Friedman method without assuming the kinetic model function, and the average value of E_a was 364±20 kJ/mol. It was shown that the crystallization mechanism of initial stage (0<α<0.7) of the transformation was bulk crystallization with two and three dimensional nucleation graining growth which was controlled by diffusion. For the middle stage (0.7<α<0.9), the crystallization mechanism is surface crystallization with one dimensional nucleation graining growth at a near-zero nucleation rate. In the final stage(α>0.9)，the local Avrami exponents rose anomalously from 1.4 to about 2.0.

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Periodical:

Materials Science Forum (Volume 688)

Pages:

180-185

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.688.180

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Online since:

June 2011

Authors:

Yu Zhang, Wei Lu, Biao Yan, Yu Xin Wang, Ying Yang

Keywords:

Amorphous Fe₈₁Si_3.5B_13.5C₂ Alloy, Crystallization Kinetics, Non-Isothermal Differential Scanning Calorimetry

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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