Influence of rolling strain on electromagnetic shielding property and mechanical properties of dual-phase Mg-9Li alloy

Highlights: • The higher strain increases the phase density of α-Mg and improves the SE value of the sample. • The increase of strain promotes texture strengthening and enhances the electromagnetic shielding performance. • Under 80% strain, the alloy has both high strength and electromagnetic shielding performance. -- Abstract: The Influence of rolling strain on electromagnetic shielding property and mechanical properties of dual-phase Mg-9Li alloy was investigated. Electromagnetic shielding performance of Mg-9Li alloy with different rolling strain was tested by flange coaxial method in the frequency of 30–1500 MHz. The microstructure, texture, and conductivity of the alloy were researched. The results show that, with the increase of rolling strain, shielding effectiveness, SE value, increases gradually. When the rolling strain is 80%, the overall SE value is in the range of 96–109 dB. The SE increment was mainly attributed to the reflection loss of the incident electromagnetic wave on the surface of the material and the multiple electromagnetic reflection loss of electromagnetic wave due to the uniformity of grain orientation of the dual-phase structure.