Patent ID: 6419769
Filing Date: 2002-07-16
Classification: C22C,C22F,F02F,F05C

Abstract:
A process for making a cast article from an aluminum alloy, which article has improved mechanical properties at elevated temperatures, the process comprising:a. Casting an article from an aluminum alloy having the following composition in weight percent: Silicon11.0-14.0Copper5.6-8.0Ironâ€‰â€‚0-0.8Magnesium0.5-1.5Nickel0.05-0.9â€‚Manganeseâ€‰â€‚0-1.0Titanium0.05-1.2â€‚Zirconium0.12-1.2â€‚Vanadium0.05-1.2â€‚Zinc0.05-0.9â€‚Strontium0.001-0.1â€ƒAluminumbalanceâ€ƒWherein the ratio of silicon:magnesium is 10-25, and the ratio of copper:magnesium is 4-15 b. Aging the cast article at a temperature within the range of 400Â° F. to 500Â° F. for a time period within the range of four to 16 hours.