During the milling process, local environments of Fe and Co in mechanically alloyed (Fe0.5Co0.5)75Si15B10 powders were systematically investigated using extended X-ray absorption fine structure (EXAFS) and 57Fe Mössbauer spectroscopy. While no substantial changes on the Fe-short-range order are observed in the Fe-edge EXAFS as a function of milling time, the Co-edge EXAFS data show significant modification on the Co-short-range order due to the presence of Si for the (Fe0.5Co0.5)75Si15B10 alloys milled longer than 10 h. Mössbauer data suggest that the milled end-sample (19 h sample) consists of nanograins of ordered BCC-FeCo (13%) embedded in FeCoSiB amorphous matrix phase.
Bibliographical noteFunding Information:
This work has been supported by the Brazilian Synchrotron Light Laboratory (LNLS) under proposal D04B-XAS1-1899. The authors would like to acknowledge the financial support provided by CSI-UNMSM under Projects No. 021301021–031301011, FAPERJ-Brazil (Cientista do Nosso Estado), FINEP, FAPES and Latin American Center of Physics.
Copyright 2009 Elsevier B.V., All rights reserved.
- Fe Mössbauer spectroscopy
- Grain boundaries
- Mechanical alloying
- Nanostructured materials