Abstract
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 μm to 30 μm, 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 Am2/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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Acknowledgement
This work was supported by the Science and Technology Research Program of Chongqing Municipal Education Commission [Grant Number KJQN202000738]; the Graduate Research and Innovation Project of Chongqing Jiaotong University [Grant Number 2022S0058]; and the Students Venture Fund of Chongqing Jiaotong University [Grant Number CY202139].
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Sun, Y., Chen, Y., Lan, C. et al. Microstructure, Particle Size, and Magnetic Property of Fe-6.5 wt.% Si Nanocrystalline Alloys Prepared by Mechanical Alloying. JOM 76, 1066–1075 (2024). https://doi.org/10.1007/s11837-023-06300-9
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DOI: https://doi.org/10.1007/s11837-023-06300-9