Improvement of electromagnetic shielding properties for Mg-8Li-6Y-2Zn alloy by heat treatment and hot rolling
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Improvement of electromagnetic shielding properties for Mg-8Li-6Y-2Zn alloy by heat treatment and hot rolling Jiahao Wang1, Siyuan Jin1, Ruizhi Wu1,2,* Legan Hou1, and Yunlei Jiao3
, Lin Xu1, Jinghuai Zhang1, Jing Feng1,
1
Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China 2 College of Science, Heihe University, Heihe 164300, China 3 Tianjin Institute of Aerospace Mechanical and Electrical Equipment, Tianjin 300301, China
Received: 28 April 2020
ABSTRACT
Accepted: 17 August 2020
The processes of heat treatment and subsequent hot rolling were carried on duplex-phase Mg-8Li-6Y-2Zn alloy to improve the electromagnetic interference (EMI) shielding effectiveness (SE) of the alloy. The microstructure and EMI SE of the alloy under different states were researched. The results show that, after heat treatment, a larger area fraction of second phase, LPSO phase, increases the multiple internal reflections of EM waves. The fine LPSO phases in the subsequent hot rolling can facilitate dynamically recrystallized grains refinement. Meanwhile, the hot rolling improves the electrical conductivity of the alloy. The increase of interfaces and electrical conductivity are both beneficial to improve the EMI SE of the alloy. The combination of heat treatment and hot rolling can provide an efficient strategy for improving the EMI SE of Mg-8Li-6Y-2Zn alloy.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Electronic equipment brings great convenience to people’s daily life. At the same time, the EM radiation pollution caused by electronic equipment becomes more and more seriously [1], becoming the fourth most serious source of public pollution in addition to noise, water and air pollution [2]. Therefore, there is a crucial requirement to develop effective and practical EMI shielding materials. Metals are typical EMI shielding materials due to the great shielding
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https://doi.org/10.1007/s10854-020-04279-6
capability and pronounced mechanical properties [3]. However, the main disadvantage of some metals are their high density and high cost, which are not suitable for most light industrial production applications. Therefore, it is necessary to develop a metal material which has low density, low cost and excellent EMI shielding capability. Mg-Li alloy is attracting increasing attention in the fields of aerospace and portable electronics due to its low density, excellent specific stiffness, recyclability and good electrical conductivity [4]. When the Li
J Mater Sci: Mater Electron
content is 5.7–10.3 wt%, the Mg-Li alloy has a hcp/ bcc duplex-phase structure (a/b phases) [5, 6]. Through rolling, the a/b phases exist in the form of alternate stripes, which can effectively increase the multiple reflection loss of EM waves [7]. In addition, the EMI SE of the alloy can be improved by promoting the precipitation of the second phase during the aging process to inc
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