Method of manufacturing aluminum alloy and aluminum alloy

Abstract

A method of manufacturing aluminum alloy may include solutionizing a cast product made of an aluminum alloy containing 0.1 to 0.3 wt % of Zr; quenching the cast product at a temperature of 30° C. or less after the solutionizing; and aging the cast product after the quenching.

What is claimed is: 
     
         1 . A method of manufacturing aluminum alloy, comprising:
 solutionizing a cast product made of an aluminum alloy containing 0.1 to 0.3 wt % of Zr;   quenching the cast product at a temperature of 30° C. or less after the solutionizing; and   aging the cast product after the quenching.   
     
     
         2 . The method of  claim 1 , wherein the solutionizing is performed at a temperature ranging from 520° C. to 560° C. for 4 to 48 hours. 
     
     
         3 . The method of  claim 1 , wherein the aging comprises primary aging and secondary aging after the primary aging so as to be performed twice. 
     
     
         4 . The method of  claim 3 , wherein the primary aging is performed at a temperature ranging from 165° C. to 195° C. for 4 to 48 hours. 
     
     
         5 . The method of  claim 4 , wherein the secondary aging is performed at a temperature ranging from 200° C. to 225° C. for 3 to 7 hours. 
     
     
         6 . A method of manufacturing aluminum alloy, comprising:
 solutionizing a cast product made of an aluminum alloy containing 0.1 to 0.3 wt % of Zr;   quenching the cast product after the solutionizing; and   aging the cast product after the quenching,   wherein the aging comprises primary aging and secondary aging after the primary aging so as to be performed twice.   
     
     
         7 . The method of  claim 6 , wherein the primary aging is performed at a temperature ranging from 165° C. to 195° C. for 4 to 48 hours. 
     
     
         8 . The method of  claim 7 , wherein the secondary aging is performed at a temperature ranging from 200° C. to 225° C. for 3 to 7 hours. 
     
     
         9 . An aluminum alloy comprising:
 Al as a base material;   6.5 to 7.5 wt % of Si;   0.35 to 0.45 wt % of Mg; and   0.1 to 0.3 wt % of Zr.   
     
     
         10 . The aluminum alloy of  claim 9 , further comprising 0.2 wt % or less of Cu. 
     
     
         11 . The aluminum alloy of  claim 9 , wherein an Al 3 Zr precipitation-strengthening phase is formed in the aluminum alloy.