Effects of different temperature on re-deforming rate of cast-rolling AZ61 magnesium alloy strip were examined.The results reveal that the ultimate re-deforming rate of magnesium strip is more than 80% at 400℃ and 350℃

while it reaches 60% at 300℃ and it falls to about 40% at 250℃

furthermore

it drops down to 20%～30% at 200℃ and only 10% at room temperature.Deformed structure observation reveals that microstructure of cold rolled alloy is substantially similar to that of cast-rolling ones in range of ultimate re-deforming rate.Grain in rolled alloy at 200℃ exists in fibrous structure due to being elongated

and grain size can be evidently refined with rolling at more than 250℃.Grain with approximately 5μm in average size can be observed with rolling at 400℃.