Application Of Titanium Alloy Materials in Large Passenger Aircraft

The development of China's completely independently developed C919 large passenger aircraft began in 2008. On November 2, 2015, the first prototype rolled off the assembly line and was tested at the Commercial Aircraft Corporation of China Co., Ltd. in Shanghai. It made its first flight on May 5, 2017. 11 The first transfer flight was carried out on December 10, and the second C919 large aircraft successfully made its first flight at Shanghai Pudong Airport on December 17, marking the entry of domestic large aircraft into a new stage of comprehensive test flights. Although the materials used in the prototype are all foreign, they are mainly for the purpose of obtaining airworthiness certification. Starting from the second aircraft, the amount of domestic materials used has increased one batch at a time, and more and more every year.

Titanium materials have been widely used in the manufacturing of large civil aircraft. Some key parts of landing gear and wheels are forged from titanium alloy, and a small number of parts are also forged from aluminum alloy. In the C919 large aircraft, the net mass of titanium alloy parts accounts for about 10% of the total net mass of the aircraft. Among civil aircraft made in China, the largest amount of titanium is used. Which parts are made of titanium (see Figure 1): Aircraft The head is made of Ti-6Al-4VEVI forgings; the suspension is made of Ti-6Al-4V alloy forgings, plates and titanium alloy 55531 forgings; the tail wing is made of Ti-6Al-4V alloy forgings; the outer wing is made of Ti -6Al-4V alloy forgings and plates; the center wing uses Ti-6Al-4V ELl alloy forgings; the landing gear system uses Ti-6Al-4V alloy forgings.

The A380 large passenger aircraft of the European Airbus Company is the world's largest wide-body civil aircraft and also uses the most titanium materials. The net mass of titanium alloy parts accounts for about 10% of the total net mass of the entire aircraft. The titanium material consumption of a single aircraft is about 65 tons. . The main parts made of titanium alloy are (see Figure 2): engine pod, skin, attachment, connecting ring wing, front bulkhead, shaft and wing between inner flaps, hinge rail raceway , trailing edge, shaft components, three stiffeners on the hinges, part of the engine hanger, propulsion components, leading edge, front bracket, part of the landing device, and weldable wing (strip) rails.