Al-Si based alloy and alloy member made therefrom

Abstract

An Al—Si based alloy and an alloy member made of the alloy, in which when alloys produced by diecasting under high vacuum conditions are welded, weldability can be improved without increasing plate thickness of welded portions and reducing gas content in diecasting.

1 . An Al—Si based alloy including Si at 7.5 to 9.0 mass %, Mg at 0.2 to 0.4 mass %, Mn at 0.3 to 0.5 mass %, Cu at 0.03 to 0.2 mass %, Fe at 0.1 to 0.25 mass %, Sr at 0.005 to 0.02 mass %, and the balance consisting of Al and inevitable impurities.  
   
   
       2 . The Al—Si based alloy according to  claim 1 , wherein Si is 7.5 to 8.5 mass %, Mg is 0.2 to 0.3 mass %, and Mn is 0.3 to 0.4 mass %.  
   
   
       3 . An alloy member subject made of the Al—Si based alloy according to  claim 1  or  2 .