The optimal composition of a metal alloy for use in manufacturing aircraft engines that can withstand high temperatures and pressures during flight would be a nickel-based superalloy. Nickel-based superalloys are known for their excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion and oxidation at high temperatures.A common nickel-based superalloy used in aircraft engines is Inconel 718, which has the following composition:- Nickel Ni : 50-55%- Chromium Cr : 17-21%- Iron Fe : balance typically around 18% - Niobium Nb : 4.75-5.5%- Molybdenum Mo : 2.8-3.3%- Titanium Ti : 0.65-1.15%- Aluminum Al : 0.2-0.8%- Cobalt Co : 1% max- Copper Cu : 0.3% max- Manganese Mn : 0.35% max- Silicon Si : 0.35% max- Carbon C : 0.08% max- Phosphorus P : 0.015% max- Sulfur S : 0.015% max- Boron B : 0.006% maxThis composition provides a balance of properties that make it suitable for use in aircraft engines, including high-temperature strength, resistance to creep, and good corrosion resistance. However, it is important to note that the specific requirements of an aircraft engine may vary, and other nickel-based superalloys or even different types of alloys may be more appropriate for specific applications.