The High-Speed Deformation Behavior of High-Strength Lightweight Al-Li Alloy Sheets

Since high-strength lightweight Al-Li alloys gained much attention recently, investigating the dynamic behavior of high-strength lightweight AA2060-T8 sheets is crucial because of their outstanding mechanical properties. Thus, uniaxial tensile tests were performed under high strain rate conditions using universal testing machines and split Hopkinson tensile bars. The ductility of AA2060-T8 sheets was improved under HSR deformation because of the adiabatic softening with increasing strain rate and the inertia effect, which may diffuse necking, slow down the necking development, and delay the onset of fracture. The present study results can efficiently develop a new manufacturing route based on impact hydroforming technology (IHF) to manufacture sound thin-walled-complex shape components from high-strength lightweight Al-Li alloy sheets at room temperature.