Microstructure Design of High-Entropy Alloys Through a Multistage Mechanical Alloying Strategy for Temperature-Stable Megahertz Electromagnetic Absorption.

Publisher: Springer Country of Publication: Germany NLM ID: 101727940 Publication Model: Electronic Cited Medium: Internet ISSN: 2150-5551 (Electronic) Linking ISSN: 21505551 NLM ISO Abbreviation: Nanomicro Lett Subsets: PubMed not MEDLINE

Publication: [Berlin] : Springer
Original Publication: Fayetteville, Ark. : OAHOST

Developing megahertz (MHz) electromagnetic wave (EMW) absorption materials with broadband absorption, multi-temperature adaptability, and facile preparation method remains a challenge. Herein, nanocrystalline FeCoNiCr 0.4 Cu 0.2 high-entropy alloy powders (HEAs) with both large aspect ratios and thin intergranular amorphous layers are constructed by a multistage mechanical alloying strategy, aiming to achieve excellent and temperature-stable permeability and EMW absorption. A single-phase face-centered cubic structure with good ductility and high crystallinity is obtained as wet milling precursors, via precisely controlling dry milling time. Then, HEAs are flattened to improve aspect ratios by synergistically regulating wet milling time. FeCoNiCr 0.4 Cu 0.2 HEAs with dry milling 20 h and wet milling 5 h (D20) exhibit higher and more stable permeability because of larger aspect ratios and thinner intergranular amorphous layers. The maximum reflection loss (RL) of D20/SiO 2 composites is greater than - 7 dB with 5 mm thickness, and EMW absorption bandwidth (RL < - 7 dB) can maintain between 523 and 600 MHz from - 50 to 150 °C. Furthermore, relying on the "cocktail effect" of HEAs, D20 sample also exhibits excellent corrosion resistance and high Curie temperature. This work provides a facile and tunable strategy to design MHz electromagnetic absorbers with temperature stability, broadband, and resistance to harsh environments.
(© 2022. The Author(s).)

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Keywords: Corrosion resistance; Electromagnetic wave absorption; High-entropy alloys; Multistage mechanical alloying; Temperature-stable

Date Created: 20220709 Latest Revision: 20230103

20240513

PMC9271152

10.1007/s40820-022-00886-6

35809143