In the ultra high temperature, ultra low temperature, high vacuum, high stress, strong corrosion and other extreme conditions, aerospace vehicles not only rely on excellent structural design, but also depend on the excellent characteristics and functions of materials. Titanium alloys are the products of space products which are called "cosmic metal" and "space metal". According to the demand of aerospace products for materials, titanium alloys are developing in the following areas:
High strength and toughness titanium alloy
Ti62222S, the material has good strength and plasticity, the room temperature fracture strength and yield strength are greater than 1300MPa and 1200MPa, and its high temperature performance is also very good. In addition, Ti62222S also has higher fracture toughness and damage tolerance, the fatigue crack growth rate is the same as alloy Ti6Al4V, and the elastic modulus and superplastic forming is better than that of Ti6Al4V alloy, so it can replace Ti6Al4V.
High temperature titanium alloy
The research and development of Supersonic cruise missile, hypersonic cruise missile, reusable launch vehicle, and reusable suborbital transatmospheric vehicles, Titanium alloys are required to be used at high temperatures of 600 degrees and above. This requires titanium alloys to have excellent resistance in high temperature. The first high-temperature titanium alloy, Ti6Al4V was developed by the United States in the world, which can be used at 300~350 degrees centigrade. Ti6Al4V alloy has the characteristics of α+β, and has been widely used in aerospace field. In order to maximize the strengthening of Al solid solution heat, Sn, Zr, Mo and Si were added into the titanium alloy, Some alloys such as IMI679 and Ti6242 with temperature of 450 DEG C have been developed. IMI685, Ti6242S and other alloys with temperature of 500 DEG C are used, and alloys such as IMI834, Ti1100 and BT36 with a temperature of 550~600 DEG C are used.
Cryogenic titanium alloy
With the rapid development of space technology, the application of titanium alloys in low temperature and extremely low temperature environment is increasing, and the development of low temperature titanium alloys is of great importance. It has been found that the low temperature properties of Ti alloy can be improved by reducing the interstitial elements such as H, O and N and the content of Al, so that it can be used for a long time under the 20K temperature environment.
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