Aluminum alloy for die casting and manufacturing method thereof

Abstract

An aluminum alloy, comprising: 4.0 to 10.0 weight % silicon (Si), 0.1 to 4.0 weight % magnesium (Mg), 0.1 to 1.0 weight % chromium (Cr), 0.05 to 1.0 weight % zinc (Zn), 0.05 to 1.0 weight % manganese (Mn), 0.01 to 1.0 weight % titanium (Ti), 0.001 to 0.5 weight % tin (Sn), and 81.5 to 95.689 weight % aluminum and at least one impurity.

What is claimed is: 
     
         1 . An aluminum alloy, comprising:
 4.0 to 10.0 weight % silicon (Si),   0.1 to 4.0 weight % magnesium (Mg),   0.1 to 1.0 weight % chromium (Cr),   0.1 to 1.0 weight % zinc (Zn) for enhancing corrosion resistance and strength of the aluminum alloy,   0.05 to 1.0 weight % manganese (Mn),   0.01 to 1.0 weight % titanium (Ti),   0.4 to 0.5 weight % tin (Sn) for enhancing machinability of the aluminum alloy,   0.8 to 1.0 weight % Zirconium (Zr) for enhancing strength and elongation of the aluminum alloy, and   aluminum (Al) and at least one impurity as the remainder.   
     
     
         2 . The aluminum alloy of  claim 1 , wherein the at least one impurity includes at least one of copper (Cu), nickel (Ni), and iron (Fe). 
     
     
         3 . The aluminum alloy of  claim 2 , wherein the copper (Cu) and the nickel (Ni) are adjusted to be equal to or less than 0.05 weight % of the aluminum alloy to prevent a decrease in corrosion resistance of the aluminum alloy. 
     
     
         4 . The aluminum alloy of  claim 3 , wherein the iron (Fe) is adjusted to be equal to or less than 0.03 weight % of the aluminum alloy to prevent a decrease in the corrosion resistance of the aluminum alloy. 
     
     
         5 . The aluminum alloy of  claim 1 , wherein the aluminum alloy is subjected to a casting temperature of 680 to 750° C. during die casting. 
     
     
         6 . The aluminum alloy of  claim 1 , wherein the aluminum alloy is subjected to a casting pressure of 75 MPa during die casting. 
     
     
         7 . The aluminum alloy of  claim 1 , wherein the aluminum alloy exhibits a tensile strength of 250 to 350 MPa. 
     
     
         8 . The aluminum alloy of  claim 1 , wherein the aluminum alloy exhibits a yield strength of 150 to 250 MPa. 
     
     
         9 . The aluminum alloy of  claim 1 , wherein the aluminum alloy is exhibits a break elongation of 2.0 to 4.5%. 
     
     
         10 . The aluminum alloy of  claim 1 , wherein the aluminum alloy is used as at least one of an external housing, an internal housing, and a bezel of an electronic device. 
     
     
         11 . The aluminum alloy of  claim 1 , wherein Ti content of the aluminum alloy is between 0.8 to 1.0 weight %. 
     
     
         12 . The aluminum alloy of  claim 1 , wherein at least a portion of the magnesium and at least a portion of the silicon in the aluminum alloy combine to form Mg 2 Si. 
     
     
         13 . The aluminum alloy of  claim 1 , wherein at least a portion of the magnesium in the aluminum alloy oxidizes to form an MgO layer on a surface of a product made from the aluminum alloy.