The solution treatment

aging and cold rolling were carried out the extruded Mg-11 Li-3 Al-xZr（x=0

0.1

mass fractim

%）alloys

and the microstructures and properties of the alloy before and after rolling were analyzed by OM

XRD and testing machine.The results show that the solution and aged Mg-11 Li-3 Al-xZr alloy is mainly composed ofβ-Li and a little granular compound

andα-Mg

θ-MgLi

2

Al and AlLi phase can be precipitated during the rolling process

and then theθ-MgLi

2

Al phase is gradually transformed into AlLi phase.With the increase of the rolling deformation rate

the grain size in the alloy is increased.The strength and elongation of the Mg-11 Li-3 Al-xZr alloy are increased at first and then decreased.Under proper deformation

both the strength and plasticity of the alloy can be improved because of the combination effects of solution strengthening

work hardening and the decomposition of strengthening phase and grain coarsening.Mg-11 Li-3 Al alloy has the best comprehensive performance at60% cold deformation

where tensile strength and elongcotion reach 242 MPa and 46%.respectively

while Mg-11 Li-3 Al-0.1 Zr alloy has the best comprehensive performance at 40% deformation

where tensile strength and elongation reach 255 MPa and 24%

respectively.