Magnesium mother alloy, manufacturing method thereof, metal alloy using the same, and method of manufacturing metal alloy

Abstract

Disclosed are a magnesium mother alloy, a manufacturing method thereof, a metal alloy using the same, and a method of manufacturing the metal alloy. In particular, there are provided a magnesium mother alloy with improved oxidation and ignition properties, and a manufacturing method thereof, and also provided a metal alloy with low cost that is suitable for design purposes using the magnesium mother alloy, and a method of manufacturing the metal alloy. The magnesium mother alloy includes a plurality of magnesium grains, and scandium dissolved in the magnesium grains, or a scandium compound crystallized at grain boundaries which are not inside but outside the magnesium grains. Also, the metal alloy suitable for design purposes is manufactured at low cost by adding the magnesium mother alloy containing scandium into a magnesium alloy or an aluminum alloy.

1 . A magnesium mother alloy comprising:
 a plurality of magnesium grains; and   scandium (Sc) dissolved in the magnesium grains.   
     
     
         2 . The magnesium mother alloy of  claim 1  wherein the scandium (Sc) is contained in the magnesium mother alloy ranging from about 0.0001 wt % to about 30 wt % based on 100 wt % of the magnesium. 
     
     
         3 . A magnesium mother alloy comprising:
 a plurality of magnesium-aluminum grains having grain boundaries; and   a scandium compound crystallized at the grain boundaries which are not inside but outside of the magnesium-aluminum grains.   
     
     
         4 . The magnesium mother alloy of  claim 3  wherein the scandium compound is selected from the group consisting of Al 2 Sc, AlSc and Al 3 Sc. 
     
     
         5 . The magnesium mother alloy of  claim 3  wherein the scandium (Sc) is contained in the scandium compound ranging from about 0.0001 wt % to about 30 wt % based on 100 wt % of the magnesium-aluminum. 
     
     
         6 . A method of manufacturing a magnesium mother alloy, the method comprising:
 forming a magnesium melt by putting magnesium into a crucible and melting the magnesium at a temperature ranging from about 600° C. to about 800° C.;   adding scandium oxide (Sc 2 O 3 ) into the magnesium melt;   stirring the magnesium melt for about 1 minute to about 400 minutes;   pouring the magnesium melt into a mold having a temperature ranging from a room temperature to about 400° C. and casting the magnesium melt; and   cooling the magnesium melt casting.   
     
     
         7 . The method as claimed of  claim 6  wherein the magnesium is selected from the group consisting of pure magnesium and magnesium-aluminum. 
     
     
         8 . The method as claimed of  claim 6  wherein the scandium oxide is added into the magnesium melt ranging from about 0.0001 wt % to about 30 wt % based on 100 wt % of the magnesium. 
     
     
         9 . A metal alloy comprising:
 a plurality of metal grains having grain boundaries; and   a scandium compound crystallized at the grain boundaries which are not inside but outside the metal grains.   
     
     
         10 . The metal alloy of  claim 9  wherein the metal is selected from the group consisting of AZ91D, AM20, AM30, AM50, AM60, AZ31, AZ61, AZ80, AS41, AS31, AS21X, AE42, AE44, AX51, AX52, AJ50X, AJ52X, AJ62X, MRI153, MRI230, AM-HP2, Mg—Al, Mg—Al—Re, Mg—Al—Sn, Mg—Zn—Sn, Mg—Si, and Mg—Zn—Y. 
     
     
         11 . The metal alloy of  claim 9  wherein the metal is selected from the group consisting of 1000-series, 2000-series, 3000-series, 4000-series, 5000-series, 6000-series, 7000-series and 8000-series wrought aluminum, and 100-series, 200-series, 300-series, 400-series, 500-series, and 700-series casting aluminum. 
     
     
         12 . The metal alloy of  claim 9  wherein the scandium compound is selected from the group consisting of Al 2 Sc, AlSc and Al 3 Sc. 
     
     
         13 . The metal alloy of  claim 9  wherein the scandium (Sc) is contained in the scandium compound ranging from about 0.0001 wt % to about 30 wt % based on 100 wt % of the metal. 
     
     
         14 . A method of manufacturing a metal alloy, the method comprising:
 forming a metal melt;   adding a magnesium mother alloy containing scandium (Sc) into the metal melt;   stirring the metal melt for about 1 minute to about 400 minutes;   pouring the metal melt into a mold having a temperature ranging from a room temperature to about 400° C. and casting the metal melt; and   cooling the metal casting.   
     
     
         15 . The method of  claim 14  wherein the magnesium mother alloy containing scandium (Sc) is added into the metal melt ranging from about 0.0001 wt % to about 30 wt % based on 100 wt % of the metal. 
     
     
         16 . The method of  claim 14  wherein the magnesium mother alloy containing scandium (Sc) is manufactured by adding about 0.0001 wt % to about 30 wt % of scandium oxide (Sc 2 O 3 ) based on 100 wt % of pure magnesium. 
     
     
         17 . The method of  claim 14  wherein the magnesium mother alloy containing scandium (Sc) is manufactured by adding about 0.0001 wt % to about 30 wt % of scandium oxide (Sc 2 O 3 ) based on 100 wt % of magnesium-aluminum. 
     
     
         18 . The method of  claim 14  wherein the magnesium mother alloy containing scandium (Sc) is selected from the group consisting of an alloy prepared by adding about 0.0001 wt % to about 30 wt % of scandium oxide (Sc 2 O 3 ) based on 100 wt % of pure magnesium, and an alloy prepared by adding about 0.0001 wt % to about 30 wt % of scandium oxide (Sc 2 O 3 ) based on 100 wt % of magnesium-aluminum. 
     
     
         19 . The method of  claim 14  wherein the metal melt is formed of one selected from the group consisting of AZ91D, AM20, AM30, AM50, AM60, AZ31, AZ61, AZ80, AS41, AS31, AS21X, AE42, AE44, AX51, AX52, AJ50X, AJ52X, AJ62X, MRI153, MRI230, AM-HP2, Mg—Al, Mg—Al—Re, Mg—Al—Sn, Mg—Zn—Sn, Mg—Si, and Mg—Zn—Y. 
     
     
         20 . The method of  claim 14  wherein the metal melt is formed of one selected from the group consisting of 1000-series, 2000-series, 3000-series, 4000-series, 5000-series, 6000-series, 7000-series and 8000-series wrought aluminum, and 100-series, 200-series, 300-series, 400-series, 500-series, and 700-series casting aluminum.