Gr5 Titanium Alloy, An Important Material in China's Aerospace Industry.

Alloy research background.

In February 1956, the Politburo meeting of the Central Committee in China passed the resolution "Instructions of the Central Committee on Intellectuals". According to the spirit of the meeting, the "1956-1967 National Science and Technology Development Plan" was compiled. In the 12-year science and technology development plan, 572 key scientific research tasks have been identified, of which 72 are the most important research projects. Titanium alloy research is one of these 72.

On New Year's Day in 1957, the Titanium Alloy Laboratory was formally established.

Development and application of titanium alloys for aviation.

In the 1950s, military aircraft entered the supersonic era. The original Lu steel structure can no longer meet the new needs, and the industrial development of titanium alloys can meet the needs of this era very well. Titanium alloy has low density, high specific strength, corrosion resistance, high temperature resistance, non-magnetic, wide use temperature, and can be used for various parts. American F22 fourth-generation aircraft uses 40% titanium (mass fraction), and its F19 engine uses 39% titanium.

Application of China's Titanium Alloy Aero Engine.

In 1964, a research and development project for the material Ti-6Al-4V (90% titanium, 6% aluminum, 4% vanadium) was established. The engine rotates very fast, more than 10,000 revolutions per minute, has a large centrifugal force, and requires excellent fatigue performance. Stainless steel is heavier, the specific gravity is about 7.9, titanium is about 4.5, the specific strength is higher, and the centrifugal force is also small. If titanium alloy is used, the weight of the aircraft can be reduced. The first test-run engine equipped with titanium alloy blades in our country was the No. 654 turbojet 6 engine. In 1979, the Ministry of National Defense decided to equip the Air Force with new fighters such as the J-8II. The engine used in the new model is the turbojet 13 series, and the amount of titanium alloy accounts for 13% of the total structural weight.