Quantification of the Effect of Increased Pre‐Deformation on Microstructure and Mechanical Properties of 2A55 Al–Li Alloy

Zeng, Guang-jun; Hong, Nian; Deng, Shaozhi; Li, Jinfeng; Ye, Yong; Guo, Ya-Fang; Lu, Ding-ding; Li, Yunwei; Liu, Zhihao; Ma, Peijun; Zhang, Ruifeng

doi:10.1002/adem.202200033

Cited by 12 publications

(2 citation statements)

References 46 publications

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“…For the multi-step hot gas forming, the initial tube accumulates dislocation density after a series of preforming, which affects the hardening properties and deformation behavior of the material during the nal hot gas forming [11]. However, most of the existing studies have focused on the basic research of hot gas forming properties and microstructure, without considering the in uence of pre-deformation in the actual manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Pre-deformation effect on the hot deformation behavior and microstructure of AA6011 tube: experimentation and modelling

Bao

Liang

et al. 2023

Int J Adv Manuf Technol

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Hot gas forming (HGF) is an advanced technique for fabricating complex-shaped hollow tubular parts.Practically, multi-step pre-forming involving pre-deformation is often necessary prior to HGF. This paper performs an experimental investigation to simulate the pre-forming operation evaluating the effect of prestrain on the subsequent HGF. Firstly, the dislocation density was accumulated with uniaxial prestretching with different strains (5%, 10% and 15%) at room temperature, simulating the pre-forming operations. Secondly, the sub-sized specimen from the pre-stretched sample was characterized at different temperatures (350, 400 and 450 ℃) to evaluate the effect of pre-strain on successive hot deformation for simulating practical HGF. The experimental results proves the coupled in uence of prestrain and temperature on the ow stress and stress-strain variations. To thoroughly understand the micro-mechanisms, EBSD analysis of grains and grain boundary angles was carried out under different pre-deformation levels and temperatures, which shows the recrystallization phenomenon at 15% prestrain and 450 ℃ temperature. Finally, a physical-mechanism constitutive model is established based on the determined macro and micro results where the pre-strain effect shows the accurate modeling of stress ow behavior of the material.

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Section: Introductionmentioning

confidence: 99%

Pre-deformation effect on the hot deformation behavior and microstructure of AA6011 tube: experimentation and modelling

Bao

Liang

et al. 2023

Int J Adv Manuf Technol

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show abstract

“…

AlÀLi alloys have been widely used as structural components in aerospace industry, such as fuselage panels, wing upper skin, and stringers, because of their low density, high strength, enhanced corrosion resistance, high damage tolerance, high fracture toughness, and low production costs. [1][2][3] The significant advantages of reduced density and increased hardness are mainly due to the addition of lithium, for every 1% addition of lithium, the density will decrease by 3% and the elastic modulus will increase by 6%. [4,5] When the Li content is higher than 1.8%, which is widely seen in previous generations of Al-Li alloys, coarse lithium-bearing phases, such as T 2 (Al 6 CuLi 3 ), can be produced and lead to severe anisotropy, poor thermal stability, and low toughness.

…”

mentioning

confidence: 99%

Effect of the Heating/Cooling Rate of Nonisothermal Aging on Microstructure and Mechanical Properties of 2050 Al–Li Alloy

Xu,

Tang,

et al. 2024

Adv Eng Mater

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The effect of the heating/cooling rate of non‐isothermal aging (NIA) on microstructure and mechanical properties of 2050 Al‐Li alloy were investigated. The 2050 Al‐Li alloy was first solid‐solutioned and pre‐deformation, and then heated from 130 °C to 220 °C at different rate of 20 °C/h, 30 °C/h or 40 °C/h and then cooled to 150 °C. The results show that the mechanical properties of the alloy subjected to NIA treatment could be improved by adjusting the heating and cooling rate. When the heating and cooling rate was 30 °C/h, the alloy achieved the best mechanical properties, the hardness, ultimate tensile strength (UTS), yield strength (YS), and elongation were 182.9 HV, 597 MPa, 571 MPa, and 9.6%, respectively. With the decrease of heating (or cooling) rate of NIA, the diameter and thickness of the T1 precipitate increased and the volume fraction decreased, resulting in the variation in mechanical properties. Therefore, in the present study, premier precipitation behavior and improved mechanical properties was both achieved by modifying the heating and cooling rate of NIA, the effect of the heating/cooling rate of NIA on the microstructure evolution of 2050 Al‐Li alloy was revealed, the underlying strengthening mechanism was investigated in detail.This article is protected by copyright. All rights reserved.

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Effect of varied initial dislocation densities on the anisotropic behavior of creep-aging in Al–Cu–Li alloy

Hui,

Zhan,

et al. 2024

J Mater Sci

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Quantification of the Effect of Increased Pre‐Deformation on Microstructure and Mechanical Properties of 2A55 Al–Li Alloy

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adem.202200033.

Cited by 12 publications

References 46 publications

Pre-deformation effect on the hot deformation behavior and microstructure of AA6011 tube: experimentation and modelling

Pre-deformation effect on the hot deformation behavior and microstructure of AA6011 tube: experimentation and modelling

Effect of the Heating/Cooling Rate of Nonisothermal Aging on Microstructure and Mechanical Properties of 2050 Al–Li Alloy

Effect of varied initial dislocation densities on the anisotropic behavior of creep-aging in Al–Cu–Li alloy

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