High-Performance Lightweight Alloy Materials and Their Advanced Forming Technologies

Lightweight alloys (magnesium, aluminum, titanium, low-density steels, and their composites) are essential for energy efficiency in transportation, aerospace, and renewable energy. However, their widespread application faces challenges, including strength-ductility trade-offs, processing defects, and corrosion-wear resistance. This Reprint features 12 contributions from the Special Issue "High-Performance Lightweight Alloy Materials and Their Advanced Forming Technologies." It covers key topics such as ultra-high-strength aerospace Al alloys, Al-Li weldability, Fe-rich phase control in recycled aluminum, extrusion mechanisms for wrought Mg components, defect-free welding of cast Mg-RE alloys, ceramic-reinforced Mg composites, titanium matrix composites via hot isostatic pressing and laser powder bed fusion, κ-carbide precipitation in low-density steels, and corrosion-wear mechanisms in high-entropy alloys. This Reprint is distinguished by its integrated perspective. Rather than treating materials in isolation, it reveals shared strategies such as composition optimization, microstructural engineering, and advanced forming technologies for unlocking next-generation structural solutions. Each manuscript addresses critical bottlenecks, offering processing-informed pathways toward improved mechanical performance and sustainability. Serving as a valuable resource for researchers and engineers, this Reprint highlights recent advances and identifies persistent gaps, offering forward-looking guidance for future innovation in lightweight alloys.