Metallic titanium was first isolated in impure form in 1887 and with higher purity in 1910. However, it was not until the 1950’s that it began to come into use as a structural material. This was initially stimulated by aircraft applications. Although the aerospace industry still provides the major market, titanium and titanium alloys are finding increasingly widespread use in other industries due to their many desirable properties.
titanium alloys readily form stable protective surface layers which give them excellent corrosion resistance in many environments, including oxidizing acids and chlorides, and good elevated temperature properties up to about 440 degrees C (1022 degrees F) in some cases.For many applications the cost of titanium alloys can be justified on the basis of desirable properties.
Other Rare Metal: Tantalum Zirconium Nickel