Research on mechanical properties and electromagnetic shielding effectiveness in Mg-8Li-2Y-Zn/Al multilayered composites fabricated by asymmetric accumulative roll bonding

The development of efficient electromagnetic shielding materials is crucial for the mitigating electromagnetic pollution. In this study, multilayered composites were prepared by stacking the Mg-8Li-2Y-Zn alloy and pure Al. The Mg-8Li-2Y-Zn alloy served mainly as the absorbing layer of the material, and the pure Al as the reflecting layer. When electromagnetic waves enter the multilayered composites, they are subjected to the processed of absorption, reflection, and reabsorption. Subsequent to a theoretical discussion of the shielding mechanism of asymmetric accumulative roll bonding (AARB) processed composites, based on the electromagnetic wave shielding model. The results indicated that the shielding effectiveness (SE) of the composites gradually increased with an increase in the number of AARB passes. The increased SE could be attributed to the obvious microstructural orientation caused by AARB and the increased number of interlayer interfaces resulting from the addition of Al layers, which facilitated the reflection loss and multiple reflection loss of incident electromagnetic waves.