Aluminum alloy and aluminum alloy casting material

Abstract

The present invention provides an aluminum alloy that has exceptional casting properties and that can exhibit high mechanical properties without being subjected to a heat treatment, and an aluminum alloy casting material. More specifically, the present invention provides: an aluminum alloy that has exceptional casting properties, and that has a high 0.2% proof stress and exceptional ductility without being subjected to a heat treatment; and an aluminum alloy casting material. The aluminum alloy according to the present invention is characterized by containing 7.0-9.0 mass % of Si, 2.0-4.0 mass % of Cu, 0.8-1.2 mass % of Mg, 0.3-0.5 mass % of Fe, 0.3-0.5 mass % of Mn, and. 2.0-4.0 mass % of Zn, the balance being Al and unavoidable impurities.

1 . An aluminum alloy comprising:
 Si: 7.0 to 9.0% by mass,   Cu: 2.0 to 4.0% by mass,   Mg: 0.8 to 1.2% by mass,   Fe: 0.3 to 0.5% by mass,   Mn: 0.3 to 0.5% by mass,   Zn: 2.0 to 4.0% by mass, and the balance being Al and unavoidable impurities.   
     
     
         2 . The aluminum alloy according to  claim 1 , which contains at least one of
 Sr: 0.008 to 0.04% by mass,   Be: 0.001 to 0.004% by mass,   Ti: 0.05 to 0.005% by mass,   B: 0.01 to 0.005% by mass.   
     
     
         3 . An aluminum alloy casting material which comprises the aluminum alloy according to  claim 1 , has a 0.2% proof stress of 230 MPa or more and an elongation at break of 2.5% or more.