An Mg–Li based alloy containing Sc addition has been prepared by melting and solidification in a carbon steel crucible, and extruded at a billet preheating temperature of 200°C with an extrusion ratio of 28. Age heat treatments and thermomechanical proces An Mg–Li based alloy containing Sc addition has been prepared by melting and solidification in a carbon steel crucible, and extruded at a billet preheating temperature of 200°C with an extrusion ratio of 28. Age heat treatments and thermomechanical proces