Patent ID: 8636855
Filing Date: 2014-01-28
Classification: C22C,C22F

Abstract:
1. A method of enhancing a mechanical property of an aluminum alloy high pressure die casting that contains internal porosity, the method comprising: forcing under high pressure a molten aluminum alloy composition into a die, wherein the aluminum alloy composition comprises at least one of magnesium, copper, silicon and zinc; solidifying the aluminum alloy composition in the die to form the aluminum alloy high pressure die casting without the use of vacuum to remove air in mold cavities during die filling such that the solidified aluminum alloy high pressure die casting retains an internal porosity; cooling the casting in the die to a quenching temperature between about 300° C. and about 500° C.; quenching the casting in a quench media immediately upon attainment of the quenching temperature of the casting; and subjecting the casting to a multi-step aging process after the casting has been quenched, the multi-step aging process comprising: