The aluminum content in Mg-Al-Zn alloy was designed and analyzed by considering rheological behavior of semi-solid billet and corrosion resistance.The results reveal that when Al content is in range of 6%

11% and the solid fraction is increased from 30%to 60%

with increasing in Al content

the temperature sensitivity of alloys is decreased and solidification temperature range is narrowed.On the other hand

the corrosion resistance demonstrates that at the same solid fraction

with increasing in solid particle amount and decreasing in solid particle size

corrosion at the initiatory stage is accelerated

however

corrosion amount is decreased.With Al content of 8%

the Mg-Al alloy can form continuousβphase

which inhibits effectively the internal corrosion of semi-solid magnesium alloy.When Al content is in range of 8%

1

1%

it is suitable for the rheological requirement and improvement of corrosion resistance of semi-solid Mg-Al-Zn alloy.