Improving Strength and Electromagnetic Shielding Effectiveness of Mg–Sn–Zn–Ca–Ce Alloy by Sn Addition
Junliu Ye, Xianhua Chen, Zhu Luo, Jianbo Li, Yuan Yuan, Jun Tan, Fusheng Pan
Abstract
The strength and electromagnetic shielding capability are two essential requirements for lightweight metallic materials as shielding materials. However, it is still a challenge to develop magnesium (Mg) alloys with both high strength and favorable electromagnetic shielding capability. Herein, the results show that alloying with Sn in Mg– x Sn–Zn–Ca–Ce alloys simultaneously increases both strength and electromagnetic shielding effectiveness (SE). After Sn alloying, the average grain size of the alloys is greatly reduced, whereas the intensity of basal texture is enhanced, and the precipitation of Mg 2 Sn phase is promoted. The Mg–3Sn–Zn–Ca–Ce alloy attains best comprehensive mechanical properties and electromagnetic SE (ultimate tensile strength (UTS) of 337 MPa and SE of 91–114 dB) in Sn containing alloys. The increase in strength is attributed to the combination of grain refinement, texture strengthening, and precipitation strengthening. The great electromagnetic SE is mainly due to the regularly arranged Mg 2 Sn precipitates in the basal plane.