Effect of aging process on microstructure and properties of 2060 Al-Li alloy formed at cryogenic temperature

doi:10.13251/j.issn.0254-6051.2023.10.009

Abstract

Abstract: Effects of aging temperature and aging time on the mechanical properties and microstructure evolution of cryogenic-formed 2060 Al-Li alloy were investigated by means of transmission electron microscope (TEM) and scanning electron microscope (SEM). The optimum aging process parameters for cryogenic temperature forming were obtained. The results show that at the initial stage of aging, the precipitated phase of the alloy is mainly spherical δ′ phase and acicular T₁ phase. With the extension of aging time, T₁ phase continues to nucleate and grow, while the number of δ′ phase decreases, the hindrance of slender T₁ relative to dislocation movement increases, and the strength of the alloy increases and reaches the peak value. When the aging time is further prolonged, the number of T₁phase does not change, but the morphology becomes thicker, and the strength of the alloy decreases. When aged at 165 ℃, 175 ℃ and 185 ℃, respectively, the time for the alloy to reach the peak aging becomes shorter with the increase of aging temperature, but compared with the higher temperature aging, the morphology of the precipitated phase after lower temperature aging is longer, the distribution is more dispersed, and the peak strength of the alloy is higher. After cryogenic temperature forming, the best comprehensive mechanical properties of 2060 Al-Li alloy can be obtained by aging at 165 ℃ for 35 h. The yield strength, tensile strength and elongation are 494 MPa, 538 MPa and 6%, respectively.

Key words: 2060 Al-Li alloy, aging treatment, precipitated phase, cryogenic temperature forming, fracture morphology

CLC Number:

TG156.6

Jia Yanzhen, Yi Youping, Huang Shiquan, Dong Fei, Huang Ke. Effect of aging process on microstructure and properties of 2060 Al-Li alloy formed at cryogenic temperature[J]. Heat Treatment of Metals, 2023, 48(10): 66-71.

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