Magnetic properties of NdFeB-based alloy under high-pressure torsion
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Andrey Mazilkin
,
Svetlana Protasova
,
Boris Straumal
and
Gregory Davdyan
Abstract
When a multicomponent NdFeB-based magnetic alloy is deformed using high-pressure torsion (HPT), a quasi-stationary state is reached after 2.5 anvil revolutions, which corresponds to an equivalent strain of ∼40 at the sample mid-radius. In this state, torque self-oscillations are observed with a period of about 1.5 s and an amplitude of ∼10 % around the average value of 550 N m−1. Such self-oscillations are accompanied by strong acoustic emission. Before HPT, the alloy under study has an almost rectangular hysteresis loop with saturation magnetization J s = 135 emu g−1 and coercivity H c = 34.8 kOe. HPT deformation at initial stages transforms this alloy to the class of soft magnets: H c drops to 1.35 × 10−4 kOe, while J s practically does not change. An increase in strain leads to a gradual increase in H c to 9.61 kOe and a decrease in J s to ∼100 emu g−1 at the number of anvil revolutions n = 7. This is explained by HPT modification of the regular grain-boundary network of neodymium-rich paramagnetic phase layers. These layers provide magnetic isolation between grains of the Nd2Fe14B ferromagnetic phase. Periodic changes in torque and J s with increasing torsion angle are caused by transitions from the amorphous phase to the crystalline one and vice versa.
Acknowledgments
The authors are grateful to Dr. A. Kilmametov (INT, Karlsruhe) for help in using the HPT setup, as well as to the facility centers at Institute of Solid State Physics Russian Academy of Sciences and at KIT, Karlsruhe. The samples for the study were provided by Vacuumschmelze GmbH.
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Author contributions: A.M. and S.P. collected the data and performed data analysis. G.D. provided samples and prepared figures. A.M. and B.S. interpreted results. All authors contributed to preparing the manuscript.
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Competing interests: The authors state no conflict of interest.
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Research funding: The authors acknowledge funding of the Russian Science Foundation, grant 22-23-00613, https://rscf.ru/project/22-22-00613/.
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Data availability: The data that support the findings of this study are available on request from the corresponding author.
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Articles in the same Issue
- Frontmatter
- Editorial
- Special issue in memory of Prof. Wolfgang Gust
- Review
- Atomic-level mechanisms of short-circuit diffusion in materials
- Original Papers
- Grain boundary diffusion and grain boundary phase transition in tungsten in the temperature range of activated sintering
- Intrinsic heterogeneity of grain boundary phase transitions in the Cu–Bi system: insights from grain boundary diffusion measurements
- Dewetting upside-down: two-sided solid state dewetting of thin gold film on soft KBr substrate
- Magnetic properties of NdFeB-based alloy under high-pressure torsion
- Thermodynamic modelling application for prediction of diffusion formation of supersaturation solution
- News
- DGM – Deutsche Gesellschaft für Materialkunde
Articles in the same Issue
- Frontmatter
- Editorial
- Special issue in memory of Prof. Wolfgang Gust
- Review
- Atomic-level mechanisms of short-circuit diffusion in materials
- Original Papers
- Grain boundary diffusion and grain boundary phase transition in tungsten in the temperature range of activated sintering
- Intrinsic heterogeneity of grain boundary phase transitions in the Cu–Bi system: insights from grain boundary diffusion measurements
- Dewetting upside-down: two-sided solid state dewetting of thin gold film on soft KBr substrate
- Magnetic properties of NdFeB-based alloy under high-pressure torsion
- Thermodynamic modelling application for prediction of diffusion formation of supersaturation solution
- News
- DGM – Deutsche Gesellschaft für Materialkunde
