High-strength Mg-6Li-3Al-0.4Ce alloy fabricated by rotary swaging

Low strength is the key factor that keeps Mg-Li alloys from further applications. Herein, a Mg-6Li-3Al-0.4Ce alloy fabricated via rotary swaging exhibits an ultimate tensile strength of 411 MPa, yield strength of 335 MPa, uniform elongation of 11 %, and specific strength of 258 kN·m·kg-1, respectively. The high yield strength is attributed to the dislocations, twins, and stacking faults (SFs) strengthening contributions. The interactions between the twin and grain boundary enhance the strain-hardening capacity. Moreover, the dislocations and soft β-Li phase with sufficient slip systems can effectively relax the stress concentration induced by twin-twin interactions, and therefore improve the ductility.