Electromagnetic interference shielding effectiveness of high entropy AlCoCrFeNi alloy powder laden composites

The electromagnetic interference (EMI) shielding effectiveness of epoxy based composite samples, containing two different sizes of high entropy AlCoCrFeNi alloy powders, was examined under Kα band [26–40 GHz] in this paper. High-energy ball milling processes were used to fabricate AlCoCrFeNi alloy p...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-02, Vol.734, p.220-228
Main Authors: Zhang, Yi, Zhang, Boliang, Li, Kuo, Zhao, Guang-Lin, Guo, S.M.
Format: Article
Language:English
Subjects:
Absorption
Alloy powders
Alloys
Ball milling
Composite materials
Electromagnetic shielding
EMI shielding effectiveness
Entropy
High entropy alloy
High entropy alloys
Mechanical alloying
Polymer matrix composites
Powder size effect
Reflection
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Summary:The electromagnetic interference (EMI) shielding effectiveness of epoxy based composite samples, containing two different sizes of high entropy AlCoCrFeNi alloy powders, was examined under Kα band [26–40 GHz] in this paper. High-energy ball milling processes were used to fabricate AlCoCrFeNi alloy powders of two different sizes, HEAL for larger sizes and HEAS for finer powders, respectively. Comparing with the 8.44 dB value of the HEAL containing sample, the HEAS sample has a maximum total shielding effectiveness (SET) of 20 dB due to the smaller powder sizes and flake-like morphology. Shielding mechanism was studied by resolving the total EMI SET into absorption and reflection portions. Absorption was found to be the major shielding mechanism and reflection had a secondary shielding effect for both HEAL and HEAS cases. •Alloy AlCoCrFeNi is found to be a potential shielding material.•The shielding effectiveness increases with decreasing AlCoCrFeNi powder sizes.•Absorption is the major shielding mechanism and reflection has a secondary shielding effect for alloy AlCoCrFeNi.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.11.044