Volume 7, Issue 4 (Autumn 2010 2010)                   IJMSE 2010, 7(4): 25-29 | Back to browse issues page

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S. Ahmadi,, H. R. Shahverdi*, S. S. Saremi. KINETICS OF -Fe NANOCRYSTALLIZATION IN Fe55Cr18Mo7B16C4 BULK AMORPHOUS ALLOY. IJMSE 2010; 7 (4) :25-29
URL: http://ijmse.iust.ac.ir/article-1-326-en.html
Abstract:   (33845 Views)

Abstract: In this research work, crystallization kinetics of Fe55Cr18Mo7B16C4 alloy was evaluated by X-ray diffraction, TEM observations and differential scanning calorimetric tests. In practice, crystallization and growth mechanisms were investigated using DSC tests in four different heating rates. Results showed that a two -step crystallization process occurred in the alloy in which - Fe phase was crystallized in the first step after annealing treatments. Activation energy for the first step of crystallization i.e. - Fe was measured to be 276 (kj/mol) according to Kissinger model. Further, avrami exponent calculated from DSC curves was 2 and a three -dimensional diffusion controlled mechanism with decreasing nucleation rate was observed in the alloy. It is also known from the TEM observations that crystalline á – Fe phase nucleated in the structure of the alloy in an average size of 10 nm and completely mottled morphology.

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