Patent ID: 8808423

Claim:
A method of manufacturing a magnesium-based alloy, the method comprising: melting magnesium (Mg) or magnesium alloy into a liquid phase; adding 0.5% to 4.0% by weight of calcium oxide (CaO) onto a surface of a melt in which the magnesium or magnesium alloy is melted; exhausting the CaO to allow the CaO not to at least substantially remain in the magnesium or magnesium alloy through a surface reduction reaction between the melt and the CaO; and forming a compound by reacting at least a portion of calcium (Ca) produced by the surface reduction reaction in the magnesium or magnesium alloy, wherein the surface reduction reaction in the magnesium or magnesium alloy includes stirring an upper layer portion of the melt, the upper layer portion having a depth from the surface thereof, the depth of the upper layer portion being no more than 20% of a total depth of the melt.