Forged aluminum alloy and manufacturing method for the same

Abstract

To provide a forged aluminum alloy excellent in creep characteristics and a manufacturing method for the forged aluminum alloy.A forged aluminum alloy contains Si: 0.10-0.25 mass %, Fe: 0.9-1.3 mass %, Cu: 1.9-2.7 mass %, Mg: 1.3-1.8 mass %, Zn: 0.10 mass % or less, Ni: 0.9-1.2 mass %, and Ti: 0.01-0.1 mass %, with the balance being Al and inevitable impurities, in which the total content of Fe and Ni is 2.2 mass % or less, the total content of Mn, Cr, and Zr is 0.20 mass % or less, the average equivalent circle diameter of an intermetallic compound is 4.5 μm or less, and variation of distance between the intermetallic compounds in the ST direction is 2.3 or less.

What is claimed is: 
     
         1 . A forged aluminum alloy, comprising:
 Si: 0.10-0.25 mass %;   Fe: 0.9-1.3 mass %;   Cu: 1.9-2.7 mass %;   Mg: 1.3-1.8 mass %;   Zn: 0.10 mass % or less;   Ni: 0.9-1.2 mass %; and   Ti: 0.01-0.1 mass %, with the balance being Al and inevitable impurities, wherein   the total content of Fe and Ni is 2.2 mass % or less,   the total content of Mn, Cr, and Zr is 0.20 mass % or less,   the average equivalent circle diameter of an intermetallic compound is 4.5 μm or less, and   variation of distance between the intermetallic compounds in the ST direction is 2.3 or less.   
     
     
         2 . A manufacturing method of a forged aluminum alloy having the alloy composition according to  claim 1 , comprising the steps of;
 cooling molten metal having the alloy composition with a cooling rate of 1.2° C./sec or more to cast an ingot; and   manufacturing a forged aluminum alloy by subjecting the ingot to homogenization treatment, hot forging, solution treatment, quenching, and temper aging treatment.