Mg-11Li-3Al-xZr（x=0

0.1）alloys were prepared by vacuum induction melting and extrusion

and microstructure of the as-cast and as-extruded alloys was observed and analyzed by OM

XRD

SEM and EDS

meanwhile

mechanical properties of the alloys were tested by tensile testing.The results indicate that the Mg-11Li-3Al-xZr（x=0

0.1）alloys consist ofβ-Li

α-Mg

θ-MgLi

2

Al and AlLi phase.In addition

Al

3

Zr phase exists in Mg-11Li-3Al-0.1Zr alloy.The grain size of the as-cast alloy exhibits coarse

while dynamic recrystallization occurs during the extrusion deformation.The addition of Zr can refine grain size obviously

where the grain size of Mg-11Li-3Al-0.1Zr alloy is only about 1/4of Mg-11Li-3Al alloy after extrusion.Mechanical properties of the two as-cast alloys are similar

while the elongation of Mg-11Li-3Al-0.1Zr is lower than that of the Mg-11Li-3Al alloy.After extrusion

the two alloys still have the high elongation

and the strength is increased obviously due to working hardening and fine grain strengthening effect.The strength of the Mg-11Li-3Al-0.1Zr alloy reaches 194 MPa

which is increased by 32.8% compared with that of the cast alloy.