Crystallization of amorphous Fe78B13Si9 |
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| Authors: | A R Bhatti B Cantor |
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| Affiliation: | (1) Oxford Centre for Advanced Materials and Composites, Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, UK;(2) Present address: Department of Materials and Structures, DRA Farnborough, GU14 6TD Hampshire, UK |
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| Abstract: | Crystallization of amorphous Fe78B13Si9 has been investigated using a combination of differential scanning calorimetry (DSC) and conventional and high-resolution transmission electron microscopy. The crystallization mechanisms and crystalline products are sensitive to the annealing temperature. At 450 C, crystallization takes place by the growth of b c c  -Fe (Si) dendrites, while at 510 and 515C there are three simultaneous reactions to form dendritic b c c -Fe (Si), elliptical crystals of b c t Fe3B and lamellar eutectic spherulites of b c c -Fe (Si) and b c t Fe3B. Quantitative TEM shows that the b c c -Fe (Si) dendrites and b c c -Fe (Si)-b c t Fe3B spherulites both form with constant nucleation and growth rates, in agreement with previous. DSC measurements of an Avrami exponent of 4. |
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