Mg-Al based alloys for high temperature casting

1 to 9% by weight aluminum (Al); Tin of from 1 to 5% by weight (Sn); From 0.5 to 6% by weight of palladium (Pd); From 0.5 to 3% by weight of zinc (Zn); The balance of magnesium (Mg); And a casting Mg-Al-based magnesium alloy consisting of impurity, and the magnesium alloy of the Mg According to the invention, the finely divided magnesium base and by delaying the destruction of the grain boundaries through the intermetallic compound precipitated fraction and-control has a high temperature strength and creep resistance of magnesium alloy can be improved.