Aluminum alloy and manufacturing method thereof

Abstract

According to the present invention, an aluminum alloy comprises 18 to 50 parts by weight of Zinc (Zn), 0.05 to 5 parts by weight of Copper (Cu), 0.001 to 0.3 parts by weight of crystal micronization elements which are at least one of vanadium (V), zirconium (Zr), titanium (Ti) and Boron (B), the rest being aluminum (Al) and other unavoidable impurities, based on the total weight of the alloy.

What is claimed is: 
     
         1 . An aluminum alloy comprising:
 18 to 50 parts by weight of Zinc (Zn);   0.05 to 5 parts by weight of Copper (Cu);   0.001 to 0.3 parts by weight of crystal micronization elements which is at least one of vanadium (V), zirconium (Zr), titanium (Ti) and Boron (B); and   the rest being aluminum (Al) and other inevitable impurities, based on the total weight of the alloy.   
     
     
         2 . The aluminum alloy of  claim 1 ,
 wherein a tensile strength in 230 to 450 MPa and an elongation in the cast state is 2.75 to 20%.   
     
     
         3 . The aluminum alloy of  claim 2 , wherein a tensile strength in the cast state is more than 310 MPa. 
     
     
         4 . The aluminum alloy of  claim 2 , wherein the elongation in the cast state is more than 10%. 
     
     
         5 . The aluminum alloy of  claim 1 , wherein the micronization elements comprises at least one of titanium and boron in the range of 0.001 to 0.2 parts by weight, based on the total weight of the alloy. 
     
     
         6 . The aluminum alloy of  claim 5 , wherein the micronization elements further comprises 0.01 to 0.05 parts by weight of zirconium, based on the total weight of the alloy. 
     
     
         7 . The aluminum alloy of  claim 5 , wherein the micronization elements further comprises 0.005 to 0.05 parts by weight of vanadium, based on the total weight of the alloy. 
     
     
         8 . The aluminum alloy of  claim 1 , wherein a yield strength in the cast state is more than 250 MPa. 
     
     
         9 . A method for manufacturing an aluminum alloy comprising:
 the step of manufacturing an alloy molten comprising 18 to 50 parts by weight of Zinc (Zn), 0.05 to 5 parts by weight of Copper (Cu), 0.001 to 0.3 parts by weight of micronization elements which are at least one of vanadium (V), zirconium (Zr), titanium (Ti) and Boron (B), and the rest being aluminum (Al) and other unavoidable impurities based on the total weight of the alloy; and   the step for casting the alloy molten.   
     
     
         10 . The method for manufacturing an aluminum alloy of  claim 9 , further comprising the step of forming a solid solution by heat-treating the cast alloy molten at a temperature of 150 to 500° C. 
     
     
         11 . The method for manufacturing an aluminum alloy of  claim 10 , further comprising the step of generating discontinuous precipitates by aging treatment the alloy molten with the solid solution at a temperature of 120 to 200° C.