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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Mangler, Clemens
University of Vienna
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2024Grain-Size-Dependent Plastic Behavior in Bulk Nanocrystalline FeAl
- 2023Interface effects on titanium growth on graphenecitations
- 2023Creation of Single Vacancies in hBN with Electron Irradiationcitations
- 2021The morphology of doubly-clamped graphene nanoribbons
- 2014Nitrogen controlled iron catalyst phase during carbon nanotube growthcitations
- 2012Radiation effects in bulk nanocrystalline FeAl alloycitations
- 2012Spinodal decomposition in (CaxBa1-x)(y)Fe4Sb12citations
- 2011Growth of nanosized chemically ordered domains in intermetallic FeAl made nanocrystalline by severe plastic deformationcitations
- 2011Three-Dimensional Analysis by Electron Diffraction Methods of Nanocrystalline Materialscitations
- 2011Thermally induced transition from a ferromagnetic to a paramagnetic state in nanocrystalline FeAl processed by high-pressure torsioncitations
- 2010Electron microscopy of severely deformed L12 intermetallicscitations
- 2010Quantitative local profile analysis of nanomaterials by electron diffractioncitations
- 2010Structural modifications during heating of bulk nanocrystalline FeAl produced by high-pressure torsioncitations
- 2008TEM study of local disordering: a structural phase change induced by high-pressure torsioncitations
- 2004Nanostructures in L12-ordered Cu3Au processed by torsion under high pressurecitations
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document
Thermally induced transition from a ferromagnetic to a paramagnetic state in nanocrystalline FeAl processed by high-pressure torsion
Abstract
The B2 ordered intermetallic compound FeAl shows a paramagnetic to ferromagnetic transition upon plastic deformation. The magnetic transformation is caused by the formation of a high density of antiphase boundary (APB) tubes leading to an increased number of Fe-Fe nearest neighbour pairs. In the present study it is shown that the temperature of the back transition from the ferromagnetic to the paramagnetic state depends strongly on the deformation mode. FeAl deformed by high pressure torsion (HPT) is investigated by differential scanning calorimetry, transmission electron microscopy and magnetic measurements. Based on the results of FeAl made nanocrystalline and disordered by HPT, it is concluded that the state of ferromagnetism vanishes almost completely at temperatures before re-ordering of the B2 long-range order has been encountered. This is in contrast to the findings reported for ball-milled FeAl indicating that the magnetic back transition and re-ordering occur at the same temperature. A model based on a vacancy driven change of Fe-Fe nearest neighbour configurations is proposed to explain the magnetic back transition after HPT deformation occurring at much lower temperatures.