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Why is titanium used in high-speed aircraft?

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A periodic table element tile for titanium displays its atomic number 22, symbol Ti, atomic weight 47.867, electron configuration, and name. Icons indicate it is a solid, transition metal with a hexagonal crystal structure and equal relative strength. — titanium Properties of titanium.

Titanium is used in high-speed aircraft primarily due to its unique combination of high strength, low density, and excellent corrosion resistance. These properties allow it to maintain structural integrity under the demanding conditions experienced by high-performance aviation vehicles.12

Specifically, titanium alloys are favored in aerospace applications for the following reasons:

High Strength-to-Weight Ratio: Titanium is a lightweight metal that provides the necessary strength for critical structural components while helping to reduce the overall weight of the aircraft.12
Thermal Stability: Certain titanium alloys are specifically modified to withstand high temperatures, making them essential for use in the fan and compressor sections of gas turbine engines, where they can operate effectively at temperatures up to 600 °C.23
Durability: Its resistance to corrosion ensures that components remain reliable over time, even when exposed to harsh environmental conditions.12

In airframes, titanium is used for components such as fasteners, landing-gear supports, and wing-support structures, where its toughness and strength are vital for safety and performance.2