Anomalous re-ordering of Fe<sub>3</sub>Al disordered by high pressure torsion deformation

Author(s)
Christoph Gammer, C. Mangler, H. P. Karnthaler, C. Rentenberger
Abstract

Severe plastic deformation of bulk DO3 ordered Fe-30 at.%Al was carried out using high pressure torsion to make a chemically disordered nanocrystalline alloy. To achieve re-ordering the alloy was heated to 250, 370 and 500 °C. Transmission electron microscopy investigations reveal that in contrast to the phase diagram B2 ordering occurs at low temperatures. Upon further heating, after the B2 order is already well restored, nanosized DO3 ordered domains grow within large B2 ordered regions. It is proposed that the anomalous re-ordering is triggered by deformation-induced vacancies and other defects leading to the formation of the high-temperature B2 ordered phase.

Organisation(s)
Physics of Nanostructured Materials
Journal
Scripta Materialia
Volume
156
Pages
90-94
No. of pages
5
ISSN
1359-6462
DOI
https://doi.org/10.1016/j.scriptamat.2018.06.043
Publication date
11-2018
Publication status
Published
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics, 103042 Electron microscopy
Keywords
Disordering, High-pressure torsion, Nanocrystalline intermetallics, Re-ordering, Transmission electron microscopy (TEM)
ASJC Scopus subject areas
Materials Science(all), Condensed Matter Physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/anomalous-reordering-of-fe3al-disordered-by-high-pressure-torsion-deformation(51dc3475-8f00-467a-a693-9ead673d4859).html