Mg-al-ca-based master alloy for mg alloys, and a production method therefor

Abstract

The present invention relates to an Mg—Al—Ca based master alloy for Mg alloys and to a production method therefor, and concerns an alloying master alloy used for magnesium or magnesium alloys. To this end, a feature of the invention is that, while the Ca:Al ration in the composition is maintained at between 7:3 and 1:9, based on percentages by weight in the alloy, a balance of Mg is added in an amount of up to 85% of the entire weight of the master alloy, based on percentage by weight. The production method comprises the steps of: preparing components of a master alloy by selecting a composition in which, while the Ca:Al ration in the composition is maintained at between 7:3 and 1:9, based on percentages by weight in the alloy, there is a balance of Mg in an amount of up to 85% of the entire weight of the master alloy, based on percentage by weight; sequentially melting Mg, Al and Ca; completely melting the components by applying an adequate amount of heat; and rapidly cooling the molten pool.

1 . An Mg—Al—Ca based master alloy for Mg alloys, wherein while a Ca:Al composition ratio is maintained at between 7:3 and 1:9, based on percentages by weight in the alloy, a balance of Mg is added in an amount of up to 85% of the entire weight of the master alloy, based on percentage by weight. 
     
     
         2 . The Mg—Al—Ca based master alloy of  claim 1 , wherein the Ca:Al composition ratio is maintained at between 6:4 and 2:8, based on percentages by weight. 
     
     
         3 . The Mg—Al—Ca based master alloy of  claim 1 , wherein the content of Al is contained in an amount of 15% or greater of the entire weight of the Mg—Al—Ca based master alloy, based on percentage by weight. 
     
     
         4 . The Mg—Al—Ca based master alloy of  claim 1 , wherein while the Ca:Al composition ratio is maintained at 4.3:5.7, Mg is contained in an amount of 65% of the entire weight of the master alloy, based on percentage by weight. 
     
     
         5 . A production method of an Mg—Al—Ca based master alloy for Mg alloys, the production method comprising:
 preparing components of a master alloy by selecting a composition in which, while a Ca:Al composition ratio is maintained at between 7:3 and 1:9, based on percentages by weight in the alloy, there is a balance of Mg in an amount of up to 85% of the entire weight of the master alloy, based on percentage by weight; 
 sequentially melting Mg, Al and Ca; 
 completely melting the components by applying an adequate amount of heat; and 
 solidifying the molten metal. 
 
     
     
         6 . The production method of  claim 5 , wherein the solidifying of the molten metal comprises rapidly cooling the molten metal. 
     
     
         7 . The production method of  claim 5 , wherein the Ca:Al composition ratio is maintained at between 6:4 and 2:8, based on percentages by weight. 
     
     
         8 . The production method of  claim 5 , wherein the content of Al is contained in an amount of 15% or greater of the entire weight of the Mg—Al—Ca based master alloy, based on percentage by weight. 
     
     
         9 . The production method of  claim 5 , wherein in the melting, Mg is first melted, Al is then melted, and Ca is finally melted. 
     
     
         10 . The production method of  claim 5 , wherein in the melting, Al is first melted, Mg is then melted, and Ca is finally melted. 
     
     
         11 . The production method of  claim 5 , wherein in the melting, Mg and Al are melted together and Ca is then melted. 
     
     
         12 . The production method of  claim 5 , wherein in the melting, Mg and Ca are melted together and Al is then melted. 
     
     
         13 . The Mg—Al—Ca based master alloy of  claim 2 , wherein the content of Al is contained in an amount of 15% or greater of the entire weight of the Mg—Al—Ca based master alloy, based on percentage by weight. 
     
     
         14 . The Mg—Al—Ca based master alloy of  claim 2 , wherein while the Ca:Al composition ratio is maintained at 4.3:5.7, Mg is contained in an amount of 65% of the entire weight of the master alloy, based on percentage by weight. 
     
     
         15 . The production method of  claim 6 , wherein the Ca:Al composition ratio is maintained at between 6:4 and 2:8, based on percentages by weight. 
     
     
         16 . The production method of  claim 6 , wherein the content of Al is contained in an amount of 15% or greater of the entire weight of the Mg—Al—Ca based master alloy, based on percentage by weight. 
     
     
         17 . The production method of  claim 6 , wherein in the melting, Mg is first melted, Al is then melted, and Ca is finally melted. 
     
     
         18 . The production method of  claim 6 , wherein in the melting, Al is first melted, Mg is then melted, and Ca is finally melted. 
     
     
         19 . The production method of  claim 6 , wherein in the melting, Mg and Al are melted together and Ca is then melted. 
     
     
         20 . The production method of  claim 6 , wherein in the melting, Mg and Ca are melted together and Al is then melted.