Phase transformations of Fe73.5Cu1Nb3Si15.5B7 amorphous alloy upon thermal treatment

Author(s)
Aleksandra Gavrilovic, Dusan M. Minic, Lidija Rafailovic, Paul Angerer, Jaroslaw Wosik, Aleksa M. Maricic, Dragica M. Minic
Abstract

The structural transformations of Fe73.5Cu1Nb3Si15.5B7 amorphous alloy under non-isothermal as well as isothermal conditions were studied. Differential scanning calorimetry (DSC) showed that slow heating rates induce a series of stepwise structural transformations consisting of endothermic peaks and more pronounced exothermic peaks in the broad temperature range from 350 to 970 K. Over this range the system changed from an as-deposited amorphous alloy of higher excess free energy to an annealed sample exhibiting lower excess of free energy. X-ray diffraction (XRD) analysis found that primary crystallization started with formation of a face-centred Fe3Si phase in an amorphous matrix. At higher temperatures (between 780 and 920 K) we detected, in addition to the Fe3Si phase, which reached an almost constant value of 85 wt%, three new phases, FeCu4, Fe16Nb6Si7 and Fe2B. Further annealing above 923 K led to, with Si initially migrating from the Fe-Si phase to the Nb-rich grain boundaries, formation of two new phases, Fe5Si3 and Nb5Si3. The Fe content in the cubic Fe-Si phase was estimated by means of a change in lattice parameter. Below 923 K the size of crystallites for the major Fe3Si phase was less than 10 nm. It was shown that further heating induced rapid crystallite growth, reaching a size greater than 500 nm at 1123 K.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Kompetenzzentrum für elektrochemische Oberflächentechnologie GmbH , University of Kragujevac, University of Belgrade
Journal
Journal of Alloys and Compounds
Volume
504
Pages
462-467
No. of pages
6
ISSN
0925-8388
DOI
https://doi.org/10.1016/j.jallcom.2010.05.145
Publication date
2010
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/phase-transformations-of-fe735cu1nb3si155b7-amorphous-alloy-upon-thermal-treatment(ecc4ef3f-7125-4ccb-8bd0-71c4c0576256).html