Titanium is particularly important for providing extreme durability (about the same as steel) and at very light (half the weight of steel), both considerations in the construction of high-performance aircraft.

However, the alloys used in jet and rocket engines; especially, in areas of intense heat and stress, are usually nickel-based or cobalt-based.

Alloys are often far less conductive of electricity and less reactive to living bodily tissue than pure metal, which makes them ideal for use in prosthetic devices, heart pacemakers, and in dentistry.