Recent Mechanically Shielded Integrated Magnesium-Based Materials and Their Research Progress: A Review

With the rapid development of 5G technology, electromagnetic pollution has become a critical issue, driving demand for structural/shielding integrated materials. Magnesium and its alloys, as the lightest metallic structural materials, possess inherent electromagnetic shielding (EMI) capability, but their low strength, poor ductility, insufficient shielding effectiveness and reflection-dominated mechanism (causing secondary pollution) limit high-end applications. This review systematically summarizes recent progress in mechanically reinforced and EMI-shielded integrated magnesium-based materials. Strengthening and toughening mechanisms are discussed, including load transfer, grain refinement, Orowan strengthening, activation of pyramidal [Formula: see text] slip, texture weakening and heterogeneous structure design to enhance strain hardening capacity. For EMI performance, the effects of grain size, texture, alloying elements and second phases are analyzed. Basal texture improves conductivity along the incident wave direction; alloying elements modulate conductivity via lattice distortion; second phases promote multiple reflections. Introducing reinforcements such as carbon nanomaterials, metal particles and magnetic ferrites creates impedance-mismatched interfaces and introduces magnetic/dielectric losses. Finally, future directions are outlined, including multiscale reinforcement design, synergistic loss mechanisms, advanced processing techniques (ECAP, accumulative roll bonding) and scalable fabrication technologies.