Aviation aluminum alloy - aluminum lithium alloy

Today we are gonna talk about aviation aluminum alloy aluminum lithium alloy. Aviation aluminum alloys include many types, such as second-series aluminum alloys, and it can be called aluminum-lithium alloys. Today we will talk about its history.

In the late 70s, the research of aluminum-lithium alloys once again attracted Western attention for four reasons: First, the oil crisis hit the aviation industry, in order to reduce weight to reduce shipping costs, the demand for high-strength, high-elastic modulus, low-specific gravity materials is more urgent. Second, due to the impact of the development of composite materials, it is necessary to study new aluminum alloys. Third, the former Soviet Union successfully used aluminum alloys for the stimulation of military aircraft. Fourth, the emergence of new alloy systems has further demonstrated the technical advantages of aluminum-lithium alloys. In this way, Western Europe launched 809 alloy 2091 alloy in the early 80s to replace 2024 alloy, while the United States launched a high-strength 2090 alloy as a replacement product for 7075 alloy. The common characteristics of these alloys are: they have a higher lithium content (2% ~ 3%), a higher elastic modulus and lower specific gravity than the 2020 alloy, and they all contain a small amount of zirconium, which is used in the unrecrystallized strong texture state. At the end of the 80s, Western countries have basically completed the research on the manufacturing technology of aluminum-lithium alloy, with industrial production capacity, forming a preliminary aviation aluminum alloy series, and the focus of research has shifted to application.

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