Titanium alloy bars are widely used ti-6al-4v (tc4), ti-5al-2.5sn (ta7) and industrial pure titanium (ta1, ta2 and ta3). Titanium alloy is mainly used in the manufacture of aircraft engine compressor parts. In the mid-1997s, titanium and its alloys were used in general industry. It was used to make electrodes for the electrolytic industry, condensers for power stations, heaters for oil refining and desalination, and Environmental pollution control devices, etc. Titanium and its alloys have become a corrosion resistant structural material. It is also used to produce hydrogen storage materials and shape memory alloys.

Titanium alloy is an alloy composed of other elements based on titanium. Titanium has two kinds of heterogeneous crystals: α-titanium with a close-packed hexagonal structure below 882 ° C, and β-titanium with a body-centered cube above 882 ° C.

Titanium is an isotope, with a melting point of 1720 ° C. When it is lower than 882 ° C, it has a close-packed hexagonal lattice structure called α titanium; above 882 ° C, it has a body-centered cubic lattice structure and is called β titanium. Utilizing the different characteristics of the above two structures of titanium, appropriate alloying elements are added to gradually change the phase transition temperature and phase separation content to obtain titanium alloys of different structures. At room temperature, titanium alloys have three matrix structures, and titanium alloys are divided into the following three categories: alpha alloys, (α + β) alloys and beta alloys. China is represented by ta, tc, tb.

Titanium is a new type of metal. The performance of titanium is related to the content of impurities such as carbon, nitrogen, hydrogen and oxygen. The content of pure titanium iodide does not exceed 0.1%, but its strength is low and its plasticity is high. The performance of 99.5% industrial pure titanium is: density ρ = 4.5g / cm3, melting point is 172 silicon titanium alloy wear-resistant floor

Thermal conductivity λ = 15.24w / (m.k), tensile strength σb = 539mpa, elongation δ = 25%, sectional shrinkage ψ = 25%, elastic modulus e = 1.078 × 105mpa, hardness hb195.

The density of titanium alloy is generally about 4.5g / cm3, which is only 60% of steel. The strength of pure titanium is close to that of ordinary steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength / density) of the titanium alloy is much larger than that of other metal structural materials, and parts and components with high unit strength, good rigidity, and light weight can be produced. At present, the engine components, skeletons, skins, fasteners and landing gears of aircraft use titanium alloys.

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