Titanium is an important structural metal developed in the 1950s. Titanium alloys are widely used in various fields due to their high strength, good corrosion resistance and high heat resistance. Many countries in the world have recognized the importance of titanium alloy materials, which have been researched and developed successively and have been put into practical use.

The first practical titanium alloy was the Ti-6Al-4V alloy successfully developed in the United States in 1954 due to its heat resistance, strength, ductility, toughness, formability, weldability, corrosion resistance and biocompatibility. It is better to become the ace alloy in the titanium alloy industry, and the alloy is used in an amount of 75% to 85% of the total titanium alloy. Many other titanium alloys can be considered as a modification of the Ti-6Al-4V alloy.

In the 1950s and 1960s, the company developed high-temperature titanium alloys for aircraft engines and structural titanium alloys for the aircraft. In the 1970s, a number of corrosion-resistant titanium alloys were developed. Since the 1980s, corrosion-resistant titanium alloys and high-strength titanium alloys have been further developed. development of. The use temperature of the heat resistant titanium alloy has increased from 400 ° C in the 1950s to 600 to 650 ° C in the 1990s. The appearance of A2 (Ti3Al) and r(TiAl) based alloys allows titanium to be propelled from the cold end (fan and compressor) of the engine to the hot end (turbine) of the engine at the point of use of the engine. Structural titanium alloys are developed in the direction of high strength, high plasticity, high strength, high toughness, high modulus and high damage tolerance.

In addition, since the 1970s, shape memory alloys such as Ti-Ni, Ti-Ni-Fe, and Ti-Ni-Nb have appeared, and have been increasingly used in engineering.

There are hundreds of titanium alloys developed in the world, and the most famous alloys are 20-30 kinds, such as Ti-6Al-4V, Ti-5Al-2.5Sn, Ti-2Al-2.5Zr, Ti-32Mo, Ti-. Mo-Ni, Ti-Pd, SP-700, Ti-6242, Ti-10-5-3, Ti-1023, BT9, BT20, IMI829, IMI834, etc.