Optimizing magnetic permeability in iron-nickel nanocrystalline powders and spark plasma sintered materials for advanced applications
Abstract This study investigates the impact of alloying elements, grain size, particle size, and spark plasma sintering (SPS) on the maximum permeability of iron-nickel nanocrystalline powders. The results show that increasing nickel content generally decreases permeability, except in the case of 50...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Springer
2025-02-01
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| Series: | Discover Applied Sciences |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s42452-025-06637-7 |
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| Summary: | Abstract This study investigates the impact of alloying elements, grain size, particle size, and spark plasma sintering (SPS) on the maximum permeability of iron-nickel nanocrystalline powders. The results show that increasing nickel content generally decreases permeability, except in the case of 50wt% Ni–Fe powder mixtures, where particle size effects dominate. Permeability is found to be grain size-dependent, with a critical grain size range of 20–30 nm, below which single-domain grains form, leading to increased permeability. However, permeability decreases with decreasing particle size, exhibiting a stepped pattern likely due to surface defects. Notably, the 40wt% Ni–Fe SPS sample exhibits a high permeability value of 6.2 × 10^-3 emu/Oe after 32 h of milling, with optimal grain sizes ranging from 425 to 475 nm for 40 and 75wt% Ni–Fe SPS alloys. Article Highlights: Nickel content generally decreases permeability, except in specific Ni–Fe mixtures with dominating particle size effects. Grain size below 30 nm boosts permeability due to the formation of single-domain grains. Optimizing grain size and sintering can significantly enhance the magnetic performance of Ni–Fe alloys. |
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| ISSN: | 3004-9261 |