Magnesium-based alloy with superior fluidity and hot-tearing resistance and manufacturing method thereof

A method of manufacturing a magnesium-based alloy, the method comprising:

• providing a melt by melting magnesium or magnesium alloy;
• applying an alkaline earth metal oxide on a surface of the melt;
• exhausting at least a portion of the alkaline earth metal oxide inside the melt through reduction reaction between the melt and the applied alkaline earth metal oxide;
• allowing an alkaline earth metal produced by the exhaustion of the alkaline earth metal oxide to react the magnesium and/or alloying element of the magnesium alloy;
• and
• removing the alkaline earth metal oxide remaining after the reaction together with dross.

A method of manufacturing a magnesium-based alloy, the method comprising:

• providing a melt by melting magnesium or magnesium alloy;
• applying an alkaline earth metal oxide on a surface of the melt;
• exhausting the alkaline earth metal oxide not to substantially remain inside the melt through sufficient reduction reaction between the melt and the applied alkaline earth metal oxide;
• and
• reacting an alkaline earth metal produced by the exhaustion of the alkaline earth metal oxide not to substantially remain inside the magnesium alloy.

A method of improving melt fluidity and hot-tearing resistance of a magnesium alloy, the method comprising:

• preparing a melt of magnesium or magnesium alloy;
• applying an alkaline earth metal oxide on a surface of the melt of the magnesium or magnesium alloy;
• and
• improving melt fluidity and hot-tearing resistance of the magnesium alloy by allowing the alkaline earth metal oxide applied on the melt to be reduced.