Aluminum alloy casting and method of manufacturing same

Abstract

An aluminum (Al)-magnesium (Mg)-silicon (Si)-based aluminum alloy casting includes: at least boron (B) and phosphorus (P). The boron (B) and the phosphorus (P) satisfy B/P≥8 in percentage by weight.

What is claimed is: 
     
         1 . An aluminum (Al)-magnesium (Mg)-silicon (Si)-based aluminum alloy casting comprising:
 at least boron (B) and phosphorus (P), wherein   the boron (B) and the phosphorus (P) satisfy B/P≥8 in percentage by weight.   
     
     
         2 . The aluminum alloy casting according to  claim 1 , further comprising:
 titanium (Ti), wherein   the boron (B), the phosphorus (P), and the titanium (Ti) satisfy (B−8P)/Ti≥0.13 in percentage by weight.   
     
     
         3 . The aluminum alloy casting according to  claim 1 , wherein
 the boron (B) is 0.005 wt % or more and 0.05 wt % or less, and the phosphorus (P) is 0.0003 wt % or more and 0.005 wt % or less.   
     
     
         4 . The aluminum alloy casting according to  claim 3 , wherein
 the magnesium (Mg) is 2.0 wt % or more and 8.0 wt % or less, the silicon (Si) is 1.0 wt % or more and 5.0 wt % or less, the titanium (Ti) is 0.2 wt % or less, and a balance includes the aluminum (Al) and inevitable impurities.   
     
     
         5 . A method of manufacturing the aluminum alloy casting according to  claim 1 , comprising:
 a melting step of melting a starting material of the aluminum alloy casting to generate a molten metal; and   a cooling step of cooling the molten metal generated in the melting step at 50° C./s or more.