Why should 7050 alloy undergo two-stage aging

The main alloying element of 7075 series aluminum alloy is zinc. Adding magnesium to the alloy containing 3%-75% zinc can form MgZn2 with significant strengthening effect, making the heat treatment effect of this alloy far better than that of aluminum-zinc binary alloy. The content of zinc and magnesium in the steel, the tensile hardness will be further improved, but its resistance to stress corrosion and spalling corrosion will be reduced. After heat treatment, it can achieve very high strength characteristics. This series of materials will generally be added Discuss alloys such as copper and chrome.

Wuxi Hengtai Aerospace Technology Co., Ltd. was established in 2001. It is an enterprise specializing in the processing and distribution of high-end aluminum alloy plates. Relying on more than ten years of industry accumulation and rigorous management system, it has won a good market reputation.

Next, the editor will take you to see why 7050 alloy should be double-aged:

Using the methods of mechanical properties and electrical conductivity testing and transmission electron microscopy observation methods, the influence of single-stage aging, double-stage aging and treatment conditions between two-stage aging on the structure and properties of the alloy 7050 alloy extruded strip was studied. The results show that 7050 alloy has a high resistance to overaging at 120℃, the tensile strength exceeds 619 MPa, but the electrical conductivity is only 32.3%IACS; the second stage aging temperature is 165℃ two-stage aging, The alloy can obtain a strength of 551 MPa and a conductivity of 40.6% IACS; the treatment conditions between the two-stage aging of the two-stage aging process have a significant effect on the strength of the alloy, and the intermittent aging and the rapid cooling after the first-stage aging are beneficial Improve the strength of the alloy; after the first stage of aging, air cooling and then aging at 165℃ for 16 h, the strength and electrical conductivity of the alloy are 559 MPa and 40.2% IACS, respectively.

7050 aluminum alloy is currently a material that is urgently needed in my country’s self-developed spacecraft and aircraft, especially the various imported aircraft. Since my country has not yet mass-produced this alloy, a considerable part of the components that require 7050 aluminum alloy are still The old alloys of the past are used or imported, so the localization of 7050 aluminum alloy is urgent.