The demand of future aviation aircraft for
titanium alloy should be higher strength, higher toughness, higher damage performance, higher high temperature resistance, etc. Application and development direction of titanium alloy materials will be: new type of super strength structure titanium alloy, high-performance damage tolerance titanium alloy, low-cost anti-fatigue titanium alloy, new type of high temperature structure titanium alloy, advanced TiAl material, titanium matrix composite material and other aspects.
The demand of structure weight reduction in modern aircraft is becoming more and more urgent. In addition to titanium alloy materials, composite materials have also been widely used in flight structures. Boeing 787 USES 50 percent of its composite materials, and airbus A380 USES 25 percent. At present, composite materials can not completely replace metal, metal materials are still indispensable. The elastic modulus of titanium alloy and carbon fiber reinforced composites were matched and the thermal expansion coefficient was similar. And has a good chemical compatibility, not easy to occur potential corrosion.F-18 "hornet" wing body joint used titanium alloy joint parts and composite material skin stepped bonding design. After years of service, the reliability of the design has been verified. With the increase of compound material content, titanium alloy material content will be further increased.
