What are the characteristics of 7055 aluminum alloy? Where is it specifically applied?

The 7055 brand was produced by Alcoa in the 1980s and is currently the most advanced commercial high-strength aluminum alloy. With the introduction of 7055, Alcoa also developed the heat treatment process for T77 at the same time.

The research on this material in China probably began in the mid to late 1990s. The industrial application of this material is relatively rare, and it is generally used in aircraft manufacturing, such as the upper wing skin, horizontal tail, dragon skeleton, and so on on on B777 and A380 Airbus.

This material is generally not available in the market, unlike 7075. The main core component of 7055 is aluminum, manganese, zinc, magnesium, and copper, which is also the main reason for the performance difference between the two. The increase in manganese element means that 7055 has stronger corrosion resistance, plasticity, and weldability compared to 7075.

It is worth mentioning that the upper skin and upper truss of the C919 wing are both 7055.