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“One generation of materials, one generation of aircraft.†Assistant Professor Zhang Xinming, an important member of the National 973 Project “Basic Research on Aviation High Performance Aluminum Alloy Materials†and Deng Yunlai, a professor at the School of Materials Science of Central South University, further explained, “As the first large-scale production in China Passenger aircraft, the choice of materials directly determines many of its characteristics."
According to Xinhua News Agency, the "chassis" of the C919 was designed and manufactured by China.
“The casing is professionally called the body, in which the aluminum alloy material accounts for about 70% of the total weight of the material.†Deng Yunlai introduced, “In order to reduce the weight and reduce the fuel consumption, the weight of the aircraft will be accurate to gram. The C919 achieves the same kind as the B737 and A320. The strategic goal of 5%-10% lighter is mainly due to the addition of lithium in aluminum alloy. Although lithium only accounts for about 2% of the weight of aluminum alloy, it can be compared with conventional aluminum under the same bearing conditions. The alloy loses more than 5% by weight."
Traditionally, many large foreign aircraft models have used a large number of conventional high-performance aluminum alloy materials, such as 7X49, 7055, 7085, 2X24 and so on. "This material also meets the characteristics of high strength, high toughness, fatigue resistance, damage resistance and corrosion resistance of aircraft body materials, but its weight will be heavier than C919." Deng Yun said.
According to public reports, the use of composite materials accounts for about 12% of the weight of the C919 aircraft. What is the "composite"?
"The composite materials used on aircraft are mainly carbon fiber reinforced resin-based composite materials, which have high corrosion resistance and light weight, and these properties are indeed superior to ordinary metal materials." Deng Yun said.
However, there is no white lunch in the world.
Deng Yunlai said with a smile: "In general, the price of composite materials is about several times that of conventional aluminum alloy materials. Even the aluminum-lithium alloy materials that we seem to be very expensive are much lower than the composite materials. So, we The C919 is only about 1/2 of the price of the Boeing 737."
“Aluminum alloy materials must have high strength and high toughness, but also fatigue resistance, damage resistance and corrosion resistance. This is a very complicated contradiction,†Zhang Xinming said. At present, domestic research on large aircraft metal materials has been obtained. About 200 patents, about half of which are owned by Central South University. "For example, strength and toughness and corrosion resistance are often contradictory. We must achieve them at the same time, and let them remain stable, we must continue to study, this is the charm of metal materials."
In response to many criticisms about the "autonomy" of large aircraft materials, Zhang Xinming said: "The characteristics of large aircraft, especially civilian large aircraft, determine that the performance requirements for materials are very high and very stable. There is a very strict set in this respect. The standards have been guaranteed. Over the years, the state has attached great importance to the research of large aircraft, and has made a lot of important progress in the field of metal materials, but after all, we have only a very large time to organize large-scale research on aluminum alloy materials for large aircraft by the state. Compared with some countries with early development abroad, there is still a big gap in the accumulation of basic, engineering research and industrial batch production technology, and it is necessary to increase the basic and applied research of aluminum alloy materials."
TZK-3070
TZK-4070
TZK-6070
TPK-4×8
TPN-4×8
TZI-4070
TZS-4060
TPP-30×60
New material aluminum alloy aviation application - C919 large aircraft decryption
Abstract "It can be said that the C919 is currently the most advanced type of metal material, and all of them are the best aluminum alloys in the world." On November 2, I learned that the C919 was officially off the assembly line and served twice as high. Performance aluminum alloy material...
“It can be said that the C919 is currently the most advanced type of metal material, and all of them are the best aluminum alloys in the world.†On November 2, I learned that the C919 was officially off the assembly line and twice served as a high-performance machine. Zhang Xinming, a professor at the School of Materials Science and Engineering at Central South University, the chief scientist of the National 973 Program for Aluminum Alloys, told reporters.
Model NO.
Moisture(%)
Strength(%)
Carbon tetrachloride(%)
Packing density(g/L)
Load content(%)
H2S(g/cc)
Grain diameter(mm)
≤15
≥95
≥70
≤660
KOH 6.0-8.0
≥0.140
Φ3.0
≤15
≥95
≥70
≤650
KOH 6.0-8.0
≥0.140
Φ4.0
≤15
≥95
≥70
≤630
KOH 6.0-8.0
≥0.140
Φ6.0
≤15
≥95
≥60
≤580
KOH 5.0-7.0
≥0.140
3.6-3.8
≤15
≥95
≥60
≤580
KOH 5.0-7.0
≥0.140
3.6-3.8
≤15
≥95
≥70
≤650
KI 2.0-6.0
≥0.140
Φ4.0
≤15
≥95
≥60
530-560
S 10.0-12.0
-
Φ4.0
≤15
≥95
≥60
-
H3PO4 5.0-15.0
-
30×60 meshes