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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Enhancement of magnetic properties in FeCoNiCr0.4Cux high entropy alloys through the cocktail effect for megahertz electromagnetic wave absorption
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Enhancement of magnetic properties in FeCoNiCr0.4Cux high entropy alloys through the cocktail effect for megahertz electromagnetic wave absorption

机译：通过鸡尾酒效应对梅尔赫兹电磁波吸收的鸡尾酒效应来提高Feconicr0.4cux高熵合金的增强

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摘要

Electromagnetic wave absorption materials for megahertz (MHz) frequency range remains a key core issue that the poor effective attenuation performance and impedance mismatch. Based on previous research and theoretical analysis, an effective solution is to improve the real and imaginary parts of the complex permeability. In addition, the absorbents are also required to have excellent temperature stability and oxidation resistance due to exposure to harsh environments such as air and high temperature. Herein, the FeCoNiCr0.4Cux high entropy alloys powders (HEAs) with planar anisotropy are prepared by mechanical alloying method. Relying on the "cocktail effect" of HEAs, the addition of appropriate Cu element can increase the aspect ratio of the particles and the shape-dependent anisotropy field to further improve the permeability. Experimentally, the real part of the permeability for the FeCoNiCr0.4Cu0.2 HEAs ranges from 2.7 to 7.5 and the imaginary part of the permeability can reach 2.7 in the MHz frequency range. The maximum reflection loss can reach -33.6 dB at 484 MHz and the effective absorption bandwidth (reflection loss <-10 dB) can almost cover the entire MHz frequency range. Furthermore, the FeCoNiCr0.4Cu0.2 HEAs have stable electromagnetic wave absorption performance and superior oxidation resistance with increasing temperature. This research exploits the characteristics of HEAs to further break the inherent magnetic limit by adjusting the morphology and provides a new pathway for solving the matter of MHz electromagnetic wave absorption. (C) 2021 Elsevier B.V. All rights reserved.
机译：兆赫（MHz）频段的电磁波吸收材料仍然是一个关键的核心问题，即有效衰减性能差和阻抗失配。基于前人的研究和理论分析，一种有效的解决方案是提高复渗透率的实部和虚部。此外，由于暴露在空气和高温等恶劣环境中，吸收剂还需要具有良好的温度稳定性和抗氧化性。在此，FeCoNiCr0。采用机械合金化方法制备了具有平面各向异性的4Cux高熵合金粉末。依靠HEAs的“鸡尾酒效应”，添加适当的铜元素可以增加颗粒的纵横比和形状相关的各向异性场，从而进一步提高渗透率。在实验上，FeCoNiCr0的渗透率的真实部分。4Cu0。2 HEA的范围为2.7至7.5，磁导率的虚部在MHz频率范围内可达到2.7。在484MHz时，最大反射损耗可达-33.6dB，有效吸收带宽（反射损耗<-10dB）几乎可以覆盖整个MHz频率范围。此外，FeCoNiCr0。4Cu0。随着温度的升高，2 HEA具有稳定的电磁波吸收性能和优异的抗氧化性。本研究利用HEA的特性，通过调整形态进一步突破固有的磁极限，为解决MHz电磁波吸收问题提供了一条新途径。（c）2021爱思唯尔B.V.保留所有权利。

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