A cast article from an aluminum alloy has improved mechanical properties at elevated
temperatures. The cast article has the following composition in weight percent:
Silicon 6.0-25.0, Copper 5.0-8.0, Iron 0.05-1.2, Magnesium 0.5-1.5, Nickel 0.05-0.9,
Manganese 0.05-1.2, Titanium 0.05-1.2, Zirconium 0.05-1.2, Vanadium 0.05-1.2, Zinc
0.05-0.9, Strontium 0.001-0.1, Phosphorus 0.001-0.1, and the balance is Aluminum,
wherein the silicon-to-magnesium ratio is 10-25, and the copper-to-magnesium ratio
is 4-15. The aluminum alloy contains a simultaneous dispersion of three types of
Al3X compound particles (X=Ti, V, Zr) having a L12 crystal
structure, and their lattice parameters are coherent to the aluminum matrix lattice.
A process for producing this cast article is also disclosed, as well as a metal
matrix composite, which includes the aluminum alloy serving as a matrix containing
up to about 60% by volume of a secondary filler material.
