Microstructure, Particle Size, and Magnetic Property of Fe-6.5 wt.% Si Nanocrystalline Alloys Prepared by Mechanical Alloying
Fe-6.5 wt.% Si nanocrystalline alloys with good magnetic softness were prepared by mechanical alloying at various milling times (0–12 h) via a high-energy ball mill. Elemental iron and silicon powders were used as raw materials. Structural evolution, particle size distribution, and magnetic properti...
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Veröffentlicht in: | JOM (1989) 2024-03, Vol.76 (3), p.1066-1075 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Fe-6.5 wt.% Si nanocrystalline alloys with good magnetic softness were prepared by mechanical alloying at various milling times (0–12 h) via a high-energy ball mill. Elemental iron and silicon powders were used as raw materials. Structural evolution, particle size distribution, and magnetic properties were investigated for as-milled Fe-Si alloy powders. During the alloying process, Si atoms dissolve substitutionally into α-Fe lattice, causing a decrease of lattice parameter with the milling time. A single α-(Fe,Si) solid-solution phase with grain size of ~ 10 nm is obtained, and no ordered phases (B2 or DO3) are observed. Ball-milling effectively reduces particle size of the alloy powders from 64
μ
m to 30
μ
m, and exhibits a controlled distribution of the particle size. A transition in the dominant factor and a deviation from the sixth power law on grain size are confirmed in the coercivity of these Fe-Si alloy powders. Good magnetic softness, with a saturation magnetization of ~ 198 Am
2
/kg and coercivity of ~ 20 A/m, has been achieved. This study validates that mechanical alloying is an effective way to produce single-phase BCC Fe-6.5 wt.% Si alloy powders for applications with magnetic powder cores. |
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ISSN: | 1047-4838 1543-1851 |
DOI: | 10.1007/s11837-023-06300-9 |