High-pressure cast aluminum alloy with excellent strength and toughness, method of producing the same and wheel disc used the same

摘要

As a result of investigations aiming at the developments of high-pressure cast Al alloy for the wheel disc to be used for 2-piece or 3-piece wheel for automobiles, that improves the strength and toughness over the conventional cast alloys and is low in cost over the forged materials, and method of producing the same, a high-pressure cast aluminum alloy for wheel disc comprising Si: 0.6 - 1.0 wt. %, Mg: 0.8 - 1.2 wt. %, Cu: 0.1 - 0.5 wt. %, Zn: 0.4 - 1.2 wt. %, Mn: 0.4 - 1.2 wt. %, Ti: 0.01 - 0.20 wt. %, B: 0.002 - 0.04 wt. % and the balance of Al and inevitable impurities, and a method of producing high-pressure cast aluminum alloy for wheel disc characterized in that the melt of said alloy is filled into mold, and then it is solidified under a pressure of 500 kgf/cm<2> or higher have been developed. <IMAGE>