Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg-9Li-3Al-1Zn Alloy Processed by Accumulative Roll Bonding

doi:10.1007/s40195-020-01017-z

Abstract

Abstract:

High electromagnetic shielding performance was achieved in the Mg-9Li-3Al-1Zn alloy processed by accumulative roll bonding (ARB). The microstructure, electromagnetic interference shielding effectiveness (SE) in the frequency of 30-1500 MHz and mechanical properties of the alloy were investigated. A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed alloy. Results indicate that the SE of the material increases gradually with the increase in the ARB pass. The enhanced SE can be attributed to the obvious microstructure orientation caused by ARB, and the alternative arrangement of alpha(Mg) phase and beta(Li) phase. In addition, with the increase in ARB pass, the number of interfaces between layers increases and the grain orientation of each layer tends to alignment along c-axis, which is beneficial to the reflection loss and multiple reflection loss of the incident electromagnetic wave.

Key words: Accumulative roll bonding (ARB), Mg-Li alloy, Dual-phase alloys, Electromagnetic interference, Reflection loss

Jiahao Wang, Lin Xu, Ruizhi Wu, Jing Feng, Jinghuai Zhang, Legan Hou, Milin Zhang. Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg-9Li-3Al-1Zn Alloy Processed by Accumulative Roll Bonding[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(4): 490-499.

Figures/Tables 12

Table 1 Chemical composition of LAZ931 alloy (wt%)

Fig. 1 Microstructures of the as-rolled Mg-9Li-3Al-1Zn alloy: a low magnification; b high magnification

Fig. 2 XRD pattern of the as-rolled Mg-9Li-3Al-1Zn alloy

Fig. 3 Three-dimensional optical micrographs of each pass: a as-rolled, b ARB1, c ARB2, d ARB3

Fig. 4 Typical SEM micrographs showing the microstructures of the alloy in various states: a, d ARB1, b, e ARB2, c, f ARB3

Fig. 5 Ple figures of α-Mg in Mg-9Li-3Al-1Zn alloy under different states: a as-rolled; b ARB3

Fig. 6 Pole figures of β-Li in Mg-9Li-3Al-1Zn alloy under different states: a as-rolled; b ARB3

Fig. 7 Electromagnetic shielding effectiveness of accumulative roll bonding alloys during 30-1500 MHz range

Table 2 EMI shielding effectiveness of Mg-9Li-3Al-1Zn alloy at different frequencies

Fig. 8 a Multilayer interface electromagnetic shielding mechanism; b reflection model of electromagnetic waves on a multilayer interface

Table 3 Comparison of the electromagnetic shielding effectiveness for several alloys prepared by different processes

Fig. 9 Tensile properties of the ARB-processed Mg-9Li-3Al-1Zn sheets

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