Abstract
Elevated temperature aluminum alloys are being developed for aircraft structural applications in the 300 F to 600 F temperature range. Material properties of various alloy systems and product forms display excellent room and elevated temperature strength, fracture toughness, and corrosion resistance. These materials are considered for applications in the aft fuselage of an Advanced Tactical Fighter (ATF). Design trade studies were conducted for a center keel beam structure between the engine compartments. Results show potential weight and cost savings of 12.8 percent and 46.5 percent, respectively, for a structure fabricated from elevated temperature aluminum alloys as opposed to titanium alloys. Additional weight and cost savings can be achieved by using hot molded metal matrix composite (MMC) Al/SiCf beam caps.
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