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FeCoNiMnAl high-entropy alloy: Improving electromagnetic wave absorption properties

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Abstract

We used mechanical alloying to prepare FeCoNiMn0.5Alx (x = 0.0, 0.1, 0.2, 0.3, 0.4) alloy powders and then annealed at 773 K. All samples show a good soft magnetic performance. The maximum saturation magnetization (Ms) is 98.41 emu/g. With the increase of Al addition, the real part of the complex permittivity (ε′) first increases and then decreases. The real part (μ′) of the complex permeability varies between 1.76 and 2.1, and the imaginary part (μ″) varies between 0.53 and 0.74. The maximum reflection loss (RL) is − 38.414 dB. After annealing, new phases (CoFe2O4 and Al86Mn14) appear, improving the values of Ms (Msmax = 124.33 emu/g) and HC (Hcmax = 181.22 Oe). After annealing, the particle sizes of the powders also increase. All of these make the permittivity and permeability of the sample increase. The RLmin of annealed samples increase to − 42.851 dB. The results are significant to the research of high-entropy alloy powder as electromagnetic wave absorbing material.

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Acknowledgments

The authors acknowledge the Support by Program for the National Natural Science Foundation of China (Nos. 52071053, U1704253), the National Key R&D Program of China (2017YFB0703103), and the Fundamental Research Funds for the Central Universities (DUT20GF111).

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Correspondence to Yuping Duan or Tongmin Wang.

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Duan, Y., Gao, M., Pang, H. et al. FeCoNiMnAl high-entropy alloy: Improving electromagnetic wave absorption properties. Journal of Materials Research 36, 2107–2117 (2021). https://doi.org/10.1557/s43578-021-00242-1

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