On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion
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In: Journal of science / Vietnam National University / Advanced materials and devices, Vol. 6.2021, No. March, 03.2021, p. 33-41.
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TY - JOUR
T1 - On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion
AU - Stückler, Martin
AU - Teichert, Christian
AU - Matković, Aleksandar
AU - Krenn, Heinz
AU - Weissitsch, Lukas
AU - Wurster, Stefan
AU - Pippan, Reinhard
AU - Bachmaier, Andrea
N1 - Publisher Copyright: © 2020 The Authors
PY - 2021/3
Y1 - 2021/3
N2 - 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.
AB - 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.
KW - High-pressure torsion
KW - Magnetic force microscopy (MFM)
KW - Nanocrystalline
KW - Severe plastic deformation (SPD)
KW - Supersaturation
KW - magnetic nanostructure
UR - http://www.scopus.com/inward/record.url?scp=85088874327&partnerID=8YFLogxK
U2 - 10.1016/j.jsamd.2020.09.013
DO - 10.1016/j.jsamd.2020.09.013
M3 - Article
AN - SCOPUS:85088874327
VL - 6.2021
SP - 33
EP - 41
JO - Journal of science / Vietnam National University / Advanced materials and devices
JF - Journal of science / Vietnam National University / Advanced materials and devices
SN - 2468-2179
IS - March
ER -