Magnesium (Mg) alloys are well known as potential candidates for engineering structural materials due to their low density and high specific strength. However, compared with traditional steel or aluminum materials, Mg alloys have not been widely used. Up to now, these present commercial products are mainly fabricated by cast. In contrast to cast products, wrought Mg alloys only have a market share of less than 5%. ^[a ^] Most of the barriers preventing wrought produces from widespread applications arising from low ductility/toughness and poor corrosion. ^[b ^] Therefore, to improve the formability and corrosion resistance becomes an urgent problem to extend the applications of deformed Mg materials. As-cast Mg-RE based single solid solution alloy has grain size of 55 μm. The elongation is higher than 30% at room temperature. The alloy exhibits obviously ductile characterization on the fracture surface, which can be regarded as a new high performance deformed materials or biomaterials.