Aluminum-magnesium alloy and method of producing the same

Abstract

Provided are an extruded aluminum (Al)-magnesium (Mg) material and a method of producing the same. An Al—Mg master alloy having a first Mg content is provided. An Al—Mg alloy having a second Mg content less than the first Mg content is prepared by adding the Al—Mg master alloy into molten Al and then casting the molten Al. An extruded Al—Mg material is prepared by extruding the Al—Mg alloy.

1 . A method of producing an aluminum (Al)-magnesium (Mg) alloy, the method comprising:
 adding Mg into first molten Al;   preparing an Al—Mg master alloy having a first Mg content by casting the first molten Al in which Mg is added;   adding the Al—Mg master alloy into second molten Al; and   casting an Al—Mg alloy having a second Mg content less than the first Mg content, by casting the second molten Al.   
     
     
         2 . The method of  claim 1 , wherein a holding time for melting the Al—Mg master alloy in the adding of the Al—Mg master alloy is less than the holding time for melting the Mg in the adding of the Mg. 
     
     
         3 . The method of  claim 1 , wherein a melting point of the Al—Mg master alloy is less than the melting point of the Mg by 100 to 200□. 
     
     
         4 . The method of  claim 1 , wherein the second Mg content is 2 to 12 wt %. 
     
     
         5 . The method of  claim 1 , wherein the first Mg content is 5 to 40 wt %. 
     
     
         6 . The method of  claim 1 , wherein an amount of a protective gas used to prevent ignition of the Mg in the adding of the Mg is greater than the amount of the protective gas used in the adding of the Al—Mg master alloy. 
     
     
         7 . The method of  claim 1 , wherein a protective gas is used to prevent ignition of the Mg in the adding of the Mg, and
 wherein the protective gas is not used in the adding of the Al—Mg master alloy.   
     
     
         8 . The method of  claim 1 , wherein an SF 6  gas is not used as a protective gas in the adding of the Al—Mg master alloy. 
     
     
         9 . The method of  claim 1 , further comprising extruding the Al—Mg alloy. 
     
     
         10 . The method of  claim 1 , further comprising rolling the Al—Mg alloy. 
     
     
         11 . A method of producing an aluminum (Al)-magnesium (Mg) alloy, the method comprising:
 providing an Al—Mg master alloy having a first Mg content;   adding the Al—Mg master alloy into molten Al; and   casting an Al—Mg alloy having a second Mg content less than the first Mg content by casting the molten Al,   wherein a melting point of the Al—Mg master alloy is less than the melting point of pure Mg by 100 to 200□.   
     
     
         12 . The method of  claim 11 , wherein the adding of the Al—Mg master alloy is performed without using a protective gas for preventing ignition of Mg. 
     
     
         13 . The method of  claim 11 , further comprising extruding or rolling the Al—Mg alloy. 
     
     
         14 . An aluminum (Al)-magnesium (Mg) alloy prepared by adding an Al—Mg master alloy having a first Mg content into molten Al and then casting the molten Al, so as to have a second Mg content less than the first Mg content. 
     
     
         15 . The Al—Mg alloy of  claim 14 , wherein the Al—Mg alloy has a higher tensile strength and an equivalent or higher elongation in comparison to a commercial Al—Mg alloy having a lower Mg content. 
     
     
         16 . The Al—Mg alloy of  claim 14 , wherein the first Mg content is 5 to 40 wt %, and the second Mg content is 2 to 12 wt %.