What Are The Uses And Types Of Titanium Alloys?

Classification of titanium alloys

Titanium is an isomer, melting point is 1720℃, below 882℃ dense hexagonal lattice structure, known as α titanium; Above 882℃, it exhibits a body centered cubic character structure, which is called β titanium. Titanium alloys with different structures can be obtained by adding appropriate alloying elements and changing the phase transition temperature and phase fraction content. At room temperature, titanium alloys have three kinds of matrix structures, which are divided into the following three categories: α alloys,(α+β) alloys and β alloys. China is represented by TA, TC and TB respectively. Titanium alloys have high strength and low density, good mechanical properties, good toughness and corrosion resistance. In addition, titanium alloy process performance is poor, cutting difficult, in hot processing, it is very easy to absorb impurities such as hydrogen, oxygen, nitrogen and carbon. There are poor wear resistance, complex production process. Industrial production of titanium began in 1948. The needs of the development of aviation industry make the titanium industry develop at an average annual growth rate of about 8%. At present, the annual output of titanium alloy processing materials in the world has reached more than 40,000 tons, nearly 30 kinds of titanium alloy. The most widely used titanium alloys are Ti-6Al-4V(TC4),Ti-5Al-2.5Sn(TA7) and industrial pure titanium (TA1, TA2 and TA3).

Titanium alloy is mainly used to make aircraft engine compressor parts, followed by rockets, missiles and high-speed aircraft structural parts. By the mid-1960s, titanium and its alloys had been used in general industry to make electrodes for electrolysis industry, condensers for power stations, heaters for oil refining and seawater desalination, and pollution control devices. Titanium and its alloys have become a kind of corrosion resistant structural materials. In addition, it is also used to produce hydrogen storage materials and shape memory alloys.

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