The Mg-9.96Zn-2.10Y（in weight

%）alloy was solidified under 2GPa

4GPa and 6GPa highpressure

and the thermal compression was conducted for the alloys solidified under as-cast

2GPa and 4GPa.Then the microstructures

phase composition and properties of the alloys prepared were analyzed by OM、SEM、XRD and hardness tester.The results indicate that microstructure of the alloy is transformed from net-like to fine columnar grain and then to cellular crystal

and intermediate phases distributed inhomogeneously with net-connect each other are transformed into fine and uniformly dispersion.XRD results show that phase constituent of alloys is varied under different solidification condition.The Vicker-hardness of the alloys is increased gradually and then decreased with the increase of the solidification pressures

and the solidification alloy at 4 GPa reaches the highest hardness.The stress-strain curves of the thermal compressed samples indicate that the peak stress is increased in the sequence of that of as-cast

2GPa

4GPa alloy

however

strain is decreased gradually.Among three alloys

alloy solidified at 4GPa exhibits desirable microstructure.