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Which parts of a gas-turbine engine contain titanium alloys?

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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.

In gas-turbine engines, titanium alloys are primarily utilized within the fan and compressor sections, where they can withstand operating temperatures of up to 600 °C.1

Specific parts of the engine that contain these alloys include:

Inlet cases1
Compressor blades1
Disks1
Hubs1
Spacers1
Seals1

These lightweight, high-strength alloys are essential to the development of modern high-bypass turbofan engines, which can consist of more than 25 percent titanium by weight. While titanium is used extensively in these sections, it is important to note that the turbine section of jet engines typically relies on nickel-based superalloys to manage the extreme temperatures and mechanical stresses found in that part of the engine.12