Abstract
Magnesium alloy has good electromagnetic shielding performance, but its shielding effectiveness on high-frequency electromagnetic waves is weak. In order to solve the above problems, aluminum, which is also a lightweight material, is covered on top of Mg. The feasibility of this method is demonstrated by microstructure analysis and measurement of conductivity and electromagnetic shielding effect, and the results show that the Al/Mg-Li/Al-X sandwich structure is improved by nearly 10 dB at 6000 MHz, and the improvement of electromagnetic shielding efficiency is attributed to the absorption loss caused by the addition of Al layer and the reflection loss at the interlayer interfaces. In addition, the alternating arrangement of α-Mg/β-Li in the Mg layer, and the interfaces formed by the Mg12YZn hard phase particles and the matrix phase also contribute to the electromagnetic shielding efficiency.
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