On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion
In this study, a preparation route of Co–Cu alloys with soft magnetic properties by high-pressure torsion deformation is introduced. Nanocrystalline, supersaturated single-phase microstructures are obtained after deformation of Co–Cu alloys, which are prepared from an initial powder mixture with Co-...
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doaj-ae6e04ed3a3b4782a9ee4aa5f2cc28432021-02-13T04:25:54ZengElsevierJournal of Science: Advanced Materials and Devices2468-21792021-03-01613341On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsionMartin Stückler0Christian Teichert1Aleksandar Matković2Heinz Krenn3Lukas Weissitsch4Stefan Wurster5Reinhard Pippan6Andrea Bachmaier7Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, Austria; Corresponding author.Institute of Physics, Montanuniversität Leoben, Franz-Josef-Straße 18, 8700, Leoben, AustriaInstitute of Physics, Montanuniversität Leoben, Franz-Josef-Straße 18, 8700, Leoben, AustriaInstitute of Physics, University of Graz, Universitätsplatz 5, 8010, Graz, AustriaErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, AustriaErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, AustriaErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, AustriaErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, AustriaIn this study, a preparation route of Co–Cu alloys with soft magnetic properties by high-pressure torsion deformation is introduced. Nanocrystalline, supersaturated single-phase microstructures are obtained after deformation of Co–Cu alloys, which are prepared from an initial powder mixture with Co-contents above 70 wt.%. Isochronal annealing treatments up to 400 °C further reveal a remarkable microstructural stability. Only at 600 °C, the supersaturated phase decomposes into two fcc-phases. The coercivity, measured by SQUID as a function of annealing temperature, remains significantly below the value for bulk-Co in all states investigated. In order to understand the measured magnetic properties in detail, a quantitative analysis of the magnetic microstructure is carried out by magnetic force microscopy and correlated to the observed changes in coercivity. Our results show that the rising coercivity can be explained by a magnetic hardening effect occurring in context with spinodal decomposition.http://www.sciencedirect.com/science/article/pii/S2468217920300873Severe plastic deformation (SPD)High-pressure torsionSupersaturationMagnetic force microscopy (MFM)Nanocrystalline |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Martin Stückler Christian Teichert Aleksandar Matković Heinz Krenn Lukas Weissitsch Stefan Wurster Reinhard Pippan Andrea Bachmaier |
spellingShingle |
Martin Stückler Christian Teichert Aleksandar Matković Heinz Krenn Lukas Weissitsch Stefan Wurster Reinhard Pippan Andrea Bachmaier On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion Journal of Science: Advanced Materials and Devices Severe plastic deformation (SPD) High-pressure torsion Supersaturation Magnetic force microscopy (MFM) Nanocrystalline |
author_facet |
Martin Stückler Christian Teichert Aleksandar Matković Heinz Krenn Lukas Weissitsch Stefan Wurster Reinhard Pippan Andrea Bachmaier |
author_sort |
Martin Stückler |
title |
On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion |
title_short |
On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion |
title_full |
On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion |
title_fullStr |
On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion |
title_full_unstemmed |
On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion |
title_sort |
on the magnetic nanostructure of a co–cu alloy processed by high-pressure torsion |
publisher |
Elsevier |
series |
Journal of Science: Advanced Materials and Devices |
issn |
2468-2179 |
publishDate |
2021-03-01 |
description |
In this study, a preparation route of Co–Cu alloys with soft magnetic properties by high-pressure torsion deformation is introduced. Nanocrystalline, supersaturated single-phase microstructures are obtained after deformation of Co–Cu alloys, which are prepared from an initial powder mixture with Co-contents above 70 wt.%. Isochronal annealing treatments up to 400 °C further reveal a remarkable microstructural stability. Only at 600 °C, the supersaturated phase decomposes into two fcc-phases. The coercivity, measured by SQUID as a function of annealing temperature, remains significantly below the value for bulk-Co in all states investigated. In order to understand the measured magnetic properties in detail, a quantitative analysis of the magnetic microstructure is carried out by magnetic force microscopy and correlated to the observed changes in coercivity. Our results show that the rising coercivity can be explained by a magnetic hardening effect occurring in context with spinodal decomposition. |
topic |
Severe plastic deformation (SPD) High-pressure torsion Supersaturation Magnetic force microscopy (MFM) Nanocrystalline |
url |
http://www.sciencedirect.com/science/article/pii/S2468217920300873 |
work_keys_str_mv |
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