Effect of two-stage aging on microstructure and properties of deformed 2A12 aluminum alloy

doi:10.13251/j.issn.0254-6051.2020.04.020

Abstract

Abstract: Effect of two-stage aging on the microstructure and properties of deformed 2A12 aluminum alloy were studied by using tensile testing machine, scanning electron microscope, metallographic microscope and other instruments. The results show that the microstructure of the alloy tends to be uniform after homogenized and annealed at 495 ℃×12 h, and more dispersed T phases are precipitated. The two-stage aging has more significant effect on improving the tensile strength of upset deformed aluminum alloy than the single-stage aging, and the temperature and time of the two-stage aging are the main factors for improving the strength. The second-stage aging temperature can't exceed 200 ℃, and the time should not exceed 6.5 h, otherwise it will cause over-melted of the material and decrease the strength.Therefore, the best heat treatment process for 2A12 aluminum alloy is 495 ℃×1 h solid solution, 100 ℃×2 h+180 ℃×6.5 h aging. After this process, the grains are refined, the secondary phase strengthening is enhanced, and the comprehensive properties of the alloy are excellent.

Key words: 2A12 aluminum alloy, solid solution treatment, two-stage aging, tensile strength, microstructure

CLC Number:

Yan Fan, Xu Jian, Zhang Xing, Yan Lin. Effect of two-stage aging on microstructure and properties of deformed 2A12 aluminum alloy[J]. Heat Treatment of Metals, 2020, 45(4): 99-104.

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