Effect of aging on tensile properties and intergranular corrosion sensitivity of 2050 Al-Li alloy

doi:10.13251/j.issn.0254-6051.2021.05.024

Abstract

Abstract: Tensile properties, intergranular corrosion (IGC) and microstructure of 2050 Al-Li alloy sheet after T6 and T8 aging for various time were investigated through tensile property measurement, immersion corrosion and transmission electron microscope (TEM) observation. The results show that the strength and elongation of the T8 aged alloy are much higher than those of the T6 aged alloy. The IGC sensitivity decreases with the T6 and T8 aging extension from initial aging to peak-aging. Further T6 and T8 aging increases the IGC sensitivity. In addition, the IGC sensitivity under the T8 aging condition is much lower than that under the T6 aging condition. Based on the strength, elongation and IGC sensitivity, the appropriate aging for 2050 Al-Li alloy sheet is T8 peak-aging, the corresponding alloy possesses the highest strength (tensile strength 529 MPa), good elongation (10%) and the lowest IGC sensitivity.

Key words: Al-Li alloy, tensile property, intergranular corrosion, aging

CLC Number:

TG156

Li Haoran, Li Zhanqi, Wang Jiayi, Ye Zhihao, Li Jinfeng, Hu Xiaoqing. Effect of aging on tensile properties and intergranular corrosion sensitivity of 2050 Al-Li alloy[J]. Heat Treatment of Metals, 2021, 46(5): 150-155.

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