Al-Si-Mg ALLOY AND METHOD OF PRODUCING THE SAME

Abstract

An Al—Si—Mg-based aluminum alloy includes about 1.2 to about 1.4 wt % of Si, about 0.6 to about 0.75 wt % of Mg, about 0.8 to about 1.0 wt % of Sn, and Al and impurities as the balance on the basis of the total weight of the aluminum alloy.

1 . An Al—Si—Mg-based alloy comprising:
 Si in an amount of about 1.2 to about 1.4 wt %;   Mg in an amount of about 0.6 to about 0.75 wt %;   Sn in an amount of about 0.8 to about 1.0 wt %; and   Al,   wherein each amount is with reference to the total weight of the alloy.   
   
   
       2 . The alloy as defined in  claim 1 , further comprising Mn in an amount of about 0.50 to about 0.70 wt % with reference to the total weight of the alloy. 
   
   
       3 . The alloy as defined in  claim 1 , further comprising one or more selected from the group consisting of:
 Fe in an amount of about 0.001 to about 0.50 wt %;   Cu in an amount of about 0.01 to about 0.10 wt %;   Cr in an amount of about 0.01 to about 0.25 wt %; and   Zn in an amount of about 0.01 to about 0.20 wt %,   wherein each amount is with reference to the total weight of the alloy.   
   
   
       4 . A method for producing an Al—Si—Mg-based alloy, the method comprising:
 providing a composition for an Al—Si—Mg-based alloy, the composition comprising:
 Si in an amount of about 1.2 to about 1.4 wt %; 
 Mg in an amount of about 0.6 to about 0.75 wt %; 
 Sn in an amount of about 0.8 to about 1.0 wt %; and 
 Al, wherein each amount is with reference to the total weight of the composition; 
   forming the composition into one or more billets through a continuous casting process; and   subjecting the one or more billets to stretching, and aging heat treatment,   wherein the aging heat treatment is carried out at a temperature between about 130 and 150° C.   
   
   
       5 . The method as defined in  claim 4 , wherein the composition further comprising Mn in an amount of about 0.50 to about 0.70 wt % with reference to the total weight of the composition. 
   
   
       6 . The method as defined in  claim 5 , wherein the composition further includes one or more selected from the group consisting of:
 Fe in an amount of about 0.001 to about 0.50 wt %;   Cu in an amount of about 0.01 to about 0.10 wt %;   Cr in an amount of about 0.01 to about 0.25 wt %; and   Zn in an amount of about 0.01 to about 0.20 wt %,   wherein each amount is with reference to the total weight of the composition.