Aluminum-zirconium-titanium-carbon grain refiner for magnesium and magnesium alloys and method for producing the same

Abstract

The present invention pertains to the field of metal alloy, and discloses an aluminum-zirconium-titanium-carbon grain refiner for magnesium and magnesium alloys, having a chemical composition of: 0.01%˜10% Zr, 0.01%˜10% Ti, 0.01%˜0.3% C, and Al in balance, based on weight percentage. Also, the present invention discloses the method for preparing the grain refiner. The grain refiner according to the present invention is an Al—Zr—Ti—C intermediate alloy having great nucleation ability and in turn excellent grain refining performance for magnesium and magnesium alloys, and is industrially applicable in the casting and rolling of magnesium and magnesium alloy profiles, enabling the wide use of magnesium in industries.

1 . An aluminum-zirconium-titanium-carbon grain refiner for magnesium and magnesium alloys, characterized in that the aluminum-zirconium-titanium-carbon grain refiner has a chemical composition of: 0.01%˜10% Zr, 0.01%˜10% Ti, 0.01%˜0.3% C, and Al in balance, based on weight percentage. 
     
     
         2 . The aluminum-zirconium-titanium-carbon grain refiner for magnesium and magnesium alloys according to  claim 1 , wherein the aluminum-zirconium-titanium-carbon grain refiner has a chemical composition of: 0.1%˜10% Zr, 0.1%˜10% Ti, 0.01˜0.3% C, and Al in balance, based on weight percentage. 
     
     
         3 . The aluminum-zirconium-titanium-carbon grain refiner for magnesium and magnesium alloys according to  claim 2 , wherein the aluminum-zirconium-titanium-carbon grain refiner has a chemical composition of: 1%˜5% Zr, 1%˜5% Ti, 0.1%˜0.3% C, and Al in balance, based on weight percentage. 
     
     
         4 . The aluminum-zirconium-titanium-carbon grain refiner for magnesium and magnesium alloys according to  claim 1 ,  2 , or  3 , wherein the contents of impurities present in the aluminum-zirconium-titanium carbon grain refiner are: Fe≦0.5%, Si≦0.3%, Cu≦0.2%, Cr≦0.2%, and other single impurity element≦0.2%, based on weight percentage. 
     
     
         5 . A method for producing the grain refiner for magnesium and magnesium alloys according to any of  claim 1 , comprising the steps of:
 a. melting commercially pure aluminum, heating to a temperature of 1000-1300° C., and adding zirconium scarp, titanium scarp and graphite powder thereto to be dissolved therein, and   b. keeping the temperature under agitation for 15-20 minutes, and performing casting molding.   
     
     
         6 . The aluminum-zirconium-titanium-carbon grain refiner for magnesium and magnesium alloys according to  claim 2 , wherein the contents of impurities present in the aluminum-zirconium-titanium carbon grain refiner are: Fe≦0.5%, Si≦0.3%, Cu≦0.2%, Cr≦0.2%, and other single impurity element≦0.2%, based on weight percentage. 
     
     
         7 . The aluminum-zirconium-titanium-carbon grain refiner for magnesium and magnesium alloys according to  claim 3 , wherein the contents of impurities present in the aluminum-zirconium-titanium carbon grain refiner are: Fe≦0.5%, Si≦0.3%, Cu≦0.2%, Cr≦0.2%, and other single impurity element≦0.2%, based on weight percentage. 
     
     
         8 . A method for producing the grain refiner for magnesium and magnesium alloys according to any of  claim 2 , comprising the steps of:
 a. melting commercially pure aluminum, heating to a temperature of 1000-1300° C., and adding zirconium scarp, titanium scarp and graphite powder thereto to be dissolved therein, and   b. keeping the temperature under agitation for 15-20 minutes, and performing casting molding.   
     
     
         9 . A method for producing the grain refiner for magnesium and magnesium alloys according to any of  claim 3 , comprising the steps of:
 a. melting commercially pure aluminum, heating to a temperature of 1000-1300° C., and adding zirconium scarp, titanium scarp and graphite powder thereto to be dissolved therein, and   b. keeping the temperature under agitation for 15-20 minutes, and performing casting molding.   
     
     
         10 . A method for producing the grain refiner for magnesium and magnesium alloys according to any of  claim 4 , comprising the steps of:
 a. melting commercially pure aluminum, heating to a temperature of 1000-1300° C., and adding zirconium scarp, titanium scarp and graphite powder thereto to be dissolved therein, and   b. keeping the temperature under agitation for 15-20 minutes, and performing casting molding.   
     
     
         11 . A method for producing the grain refiner for magnesium and magnesium alloys according to any of  claim 6 , comprising the steps of:
 a. melting commercially pure aluminum, heating to a temperature of 1000-1300° C., and adding zirconium scarp, titanium scarp and graphite powder thereto to be dissolved therein, and   b. keeping the temperature under agitation for 15-20 minutes, and performing casting molding.   
     
     
         12 . A method for producing the grain refiner for magnesium and magnesium alloys according to any of  claim 7 , comprising the steps of:
 a. melting commercially pure aluminum, heating to a temperature of 1000-1300° C., and adding zirconium scarp, titanium scarp and graphite powder thereto to be dissolved therein, and   b. keeping the temperature under agitation for 15-20 minutes, and performing casting molding.