Magnetic Resonance Modulation and Low-frequency Absorbing Properties of Cr and Mn Co-doped FeSiAl Alloy Absorbers

WANG Chi; LIAO Chenxi; WANG Xu; XU Yifan; HU Yuchen; CHEN Zhihong

doi:10.19554/j.cnki.1001-3563.2026.13.036

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (13) : 331-342. DOI: 10.19554/j.cnki.1001-3563.2026.13.036

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Magnetic Resonance Modulation and Low-frequency Absorbing Properties of Cr and Mn Co-doped FeSiAl Alloy Absorbers

WANG Chi^a, LIAO Chenxi^b, WANG Xu^a, XU Yifan^b, HU Yuchen^a, CHEN Zhihong^a*

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Abstract

The work aims to propose a collaborative optimization method of electromagnetic properties based on phase transformation regulation of FeSiAl alloy, and design an absorber suitable for strong broadband absorption in P-L-S band. The energy barrier of ordering transformation from A2 phase to DO3 phase in FeSiAl alloy was improved through solid solution doping of Cr and Mn, so that the metastable B2 phase could be stably retained. The precise control of this effect was achieved in Fe_81.8Si_4.8Al_5.4(Cr_8-_xMn_x) alloy powders by vacuum melting, gas atomization, stirring ball milling and heat treatment. The introduction of doped atoms successfully constructed the microstructure of A2, B2 and DO3 under three-phase coexistence. The B2 phase was stably retained at 14.9 at.% after annealing at 500 °C. The superposition of the natural resonance spectrum of each phase increased the imaginary part of the permeability of 1-6 GHz by about 30%. At the same time, the solid solution of Mn atoms reduced the conductivity of the alloy powder, so that the complex dielectric constant was reduced to a range conducive to impedance matching. When the thickness of the absorbing material was 2.0 mm, the reflectivity RL was ≤-5 dB from 1.93 GHz to 5.38 GHz, and the absorption bandwidth reached 3.45 GHz, which was 83.5% higher than that of the undoped sample. The heterogeneous structure constructed by adjusting the phase transformation kinetics can effectively coordinate the electromagnetic response of FeSiAl alloy and realize the low-frequency broadband absorption of microwaves.

Key words

FeSiAl alloy / magnetic resonance / microwave absorption / low-frequency

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WANG Chi, LIAO Chenxi, WANG Xu, XU Yifan, HU Yuchen, CHEN Zhihong. Magnetic Resonance Modulation and Low-frequency Absorbing Properties of Cr and Mn Co-doped FeSiAl Alloy Absorbers[J]. Packaging Engineering. 2026, 47(13): 331-342 https://doi.org/10.19554/j.cnki.1001-3563.2026.13.036

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