Aluminum Alloy Processing Method and Aluminum Alloy Workpiece

Abstract

Provided is a method for processing art aluminum alloy comprising: 0.5% by mass or more and 1.0% by mass or less of Mg, 0.5% by mass or more and 3.0% by mass or less of Si, 0.2% by mass or more and 0.4% by mass or less of Cu, 0.15% by mass or more and 0.25% by mass or less of Mn, 0.1% by mass or more and 0.2% by mass or less of Ti, and 120 ppm by mass or less of Sr, the method comprising casting the aluminum alloy and forging the cast aluminum at; a temperature of 200° C. or more and 470° C. or less.

What is claimed is: 
     
         1 . A method for processing an aluminum alloy comprising: 0.5% by mass or more and 1.0% by mass or less of Mg, 0.5% by mass or more and 3.0% by mass or less of Si, 0.2% by mass or more and 0.4% by mass or less of Cu, 0.15% by mass or more and 0.25% by mass or less of Mn, 0.1% by mass or more and 0.2% by mass or less of Ti, and 120 ppm by mass or less of Sr,
 the method comprising casting the aluminum alloy and   forging the cast aluminum at a temperature of 200° C. or more and 470° C. or less.   
     
     
         2 . The method for processing the aluminum alloy according to  claim 1 , wherein the cast aluminum alloy is forged at a temperature of 400° C. or more and 450° C. or less. 
     
     
         3 . An aluminum alloy workpiece, comprising:
 0.5% by mass or more and 1.0% by mass or less of Mg, 0.5% by mass or more and 3.0% by mass or less of Si, 0.2% by mass or more and 0.4% by mass or less of Cu, 0.15% by mass or more and 0.25% by mass or less of Mn, 0.1% by mass or more and 0.2% by mass or less of Ti, and 120 ppm by mass or less of Sr, and   having a Z parameter of 1.44×10 9  s −1  or more and 1.18×10 15  s −1  or less.   
     
     
         4 . The aluminum alloy workpiece according to  claim 3 , wherein the aluminum alloy workpiece has a Z parameter of 2.73×10 9  s −1  or more and 1.58×10 10  s −1  or less.