Electromagnetic wave-absorbing behavior of soft-magnetic medium entropy alloys with BCC/L21 coherent microstructure

Zhiyao Ji; Qing Wang; Zhenhua Wang; Yuping Duan; Chuang Dong; Peter K. Liaw

Materials & Design (Oct 2022)

Electromagnetic wave-absorbing behavior of soft-magnetic medium entropy alloys with BCC/L21 coherent microstructure

Zhiyao Ji,
Qing Wang,
Zhenhua Wang,
Yuping Duan,
Chuang Dong,
Peter K. Liaw

Affiliations

Zhiyao Ji: Engineering Research Center of High Entropy Alloy Materials (Liaoning Province), Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
Qing Wang: Engineering Research Center of High Entropy Alloy Materials (Liaoning Province), Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China; Corresponding authors.
Zhenhua Wang: Engineering Research Center of High Entropy Alloy Materials (Liaoning Province), Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
Yuping Duan: Engineering Research Center of High Entropy Alloy Materials (Liaoning Province), Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China; Corresponding authors.
Chuang Dong: Engineering Research Center of High Entropy Alloy Materials (Liaoning Province), Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
Peter K. Liaw: Department of Materials Science and Engineering, The University of Tennessee, Knoxville 37996, TN, USA

Journal volume & issue: Vol. 222
p. 111054

Abstract

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Magnetic alloy powders show a great superiority in the balance of permittivity and permeability for electromagnetic (EM) wave-absorption. However, it is necessary to enhance their effective absorption bandwidth (Δf) and impedance matching due to their insufficient soft-magnetic properties and low resistivity, which would be solved by high/medium-entropy alloys (HEAs/MEAs). In this report, we designed Al1.5Co3.5Fe3.5 and Al1.5Co3Fe3Cr MEAs with prominent soft-magnetic property and high resistivity. It is contributed to the special coherent microstructure with ultrafine magnetic body-centered-cubic nanoprecipitates uniformly-distributed into the L21 matrix, which could not be changed by ball-milling. Thus, alloy powders possess excellent EM properties, as evidenced by the minimum reflection loss of −42.2 dB at 14.52 GHz and the largest Δf = 7.01 GHz in 5 h-milled Al1.5Co3.5Fe3.5, better than existing alloy powders. The wave-absorbing behavior of MEA powders was discussed from both permittivity and permeability. The current findings offer a useful design strategy for developing high-performance absorbers.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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