(1) Reduce the structure weight, improve the efficiency of the structure, advanced performance, such as supersonic aircraft lighter aircraft with low structure weight coefficient (i.e., the body weight/structure plane normal take-off weight), and the intensity of
titanium alloy is close to the characteristics of strong steel but density is small, instead of structural steel and high temperature alloy, can greatly reduce the structure weight, also can save cost; Take the engine as an example. Statistics show that the operating cost of an aircraft engine can be reduced by about $220-440 for each kilogram decrease in the mass of the engine.
(2) In line with the use of high temperature parts: titanium alloy has the characteristics of good heat resistance, such as the commonly used Ti-6Al-4V can work at 350℃ for a long time, so in the high temperature parts of the aircraft (such as the rear fuselage) can replace the high temperature performance can not meet the requirements of the aluminum alloy; TC11 can work at 500℃ for a long time. It can replace superalloy and stainless steel in the compressor part of the engine.
(3) Conform to the requirements of matching with the structure of composite materials: in order to reduce the weight of the structure and meet the requirements of stealth, advanced aircraft use a large number of composite materials, titanium alloy and composite material strength and stiffness match well, can obtain a good weight reduction effect. At the same time, because the potential of the two is close, it is not easy to produce galvanic corrosion, so the structural parts and fasteners of the corresponding parts should use titanium alloy.
(4) In line with the requirements of high corrosion resistance and long life: titanium alloy has high fatigue life and excellent corrosion resistance, can improve the corrosion resistance and life of the structure, to meet the requirements of advanced aircraft, engine high reliability and long life.
