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Electromagnetic wave absorption properties of FeCoNiCrAl0.8 high entropy alloy powders and its amorphous structure prepared by high-energy ball milling

Published online by Cambridge University Press:  29 July 2016

Peipei Yang
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
Ying Liu*
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
Xiuchen Zhao
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
Jingwei Cheng
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
Hong Li*
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We investigated FeCoNiCrAl0.8 high entropy alloy and amorphous alloy powders synthesized simply via high energy ball milling for 10 and 20 h. The electromagnetic wave absorption properties of FeCoNiCrAl0.8 high entropy alloy and amorphous alloy powders were investigated. The structure and morphology of FeCoNiCrAl0.8 were analyzed by scanning electron microscopy with energy-dispersive spectrometry and x-ray diffraction, which demonstrated that FeCoNiCrAl0.8 powders were in irregular shape and monodisperse with an average size of 5–15 µm. The minimum reflection loss of FeCoNiCrAl0.8 high entropy alloy powders was −41.8 dB at 11.9 GHz with a thickness of 2.3 mm and effective bandwidth (RL ≤ −10 dB) was up to 4.7 GHz (8.7–13.4 GHz), while the minimum reflection loss of FeCoNiCrAl0.8 amorphous alloy powders was observed to be −35.5 dB at 14.6 GHz with a thickness of 1.7 mm and effective bandwidth varied from 12.7 to 16.3 GHz (3.6 GHz). Electromagnetic wave absorption properties of FeCoNiCrAl0.8 high entropy alloy powders is better than that of amorphous alloy powders, which demonstrated that phase structures of FeCoNiCrAl0.8 alloy powders affect electromagnetic wave absorption properties.

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Copyright
Copyright © Materials Research Society 2016 

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