Effect of thermal exposure on mechanical properties and microstructure of 2014-T6 aluminum alloy

Yue Lei; Min Hao

doi:10.1117/12.3007259

25 October 2023 Effect of thermal exposure on mechanical properties and microstructure of 2014-T6 aluminum alloy

Yue Lei, Min Hao

Proceedings Volume 12801, Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023); 128010V (2023) https://doi.org/10.1117/12.3007259
Event: Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023), 2023, Dalian, China

Abstract

This paper investigates the effect of different heat exposure temperatures (150 ℃, 200 ℃, 250 ℃) and time (1h~100h) on mechanical properties and microstructure of 2014-T6 aluminum alloy. The room temperature and elevated temperature tensile strength losses under various heat exposure process were measured, revealing the microstructure changes of the alloy, the appropriate operating temperature for the alloy were discussed as well. The results indicate that the 2014-T6 aluminum alloy is able to operate within 1 hour from 150 ℃ to 200 ℃ with no significant changes in mechanical properties. As the exposure temperature increases from 150 ℃ to 250 ℃, the room temperature and elevated temperature tensile properties of 2014-T6 aluminum alloy show a downward trend, while the conductivity show an upward trend in contrast. After exposed at 150 ℃ for 1 to 100 hours, there were no significant changes in tensile properties and electrical conductivity. When exposed at 200 ℃~250 ℃ for 1-100 hours, the alloy suffer to a strength loss. After exposed at 200 ℃ and 250 ℃ for 100 hours, the yield strength of room temperature decreased by 34.4% and 73.7%, the tensile strength decreased by 21.9% and 54.4%, the yield strength of elevated temperature decreased by 31.1% and 71.9%, and the tensile strength decreased by 26.5% and 68.1% respectively. Meanwhile, the conductivity increased by 13.2% and 24.1% respectively. The main precipitates in 2014-T6 alloy are θ’ phases, after exposed at 200 ℃/10h, the coarsening of the phases lead to a decrease in mechanical properties of the alloy. Under the experimental conditions of K_t=1 and R=0.1, the fatigue limit after 200 ℃/10h thermal exposure is 298MPa, which is 17.5% lower than the fatigue limit of 361MPa before thermal exposure.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yue Lei and Min Hao "Effect of thermal exposure on mechanical properties and microstructure of 2014-T6 aluminum alloy", Proc. SPIE 12801, Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023), 128010V (25 October 2023); https://doi.org/10.1117/12.3007259

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KEYWORDS

Alloys

Aluminum

Materials properties

Thermal effects

Electrical conductivity

Material fatigue

Temperature metrology

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