Effect of Different Aging Processes on the Microstructure and Mechanical Properties of a Novel Al–Cu–Li Alloy

Li, Hongying; Huang, Desheng; Kang, Wei; Liu, Jiaojiao; Ou, Yangxun; Li, Dewang

doi:10.1016/j.jmst.2016.01.018

Cited by 84 publications

(15 citation statements)

References 26 publications

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“…The crack initiates at the edge of the sample and then propagates approximately perpendicular to the loading direction. Usually, fatigue crack easily initiates around impurity particles (e.g., AlCuLiMg and AlFeMnSi), the interface between impurity and the matrix, or the stress concentration area like grain boundaries, sub-grain boundaries [38,39]. According to our experiment, impurities are not observed at the crack initiation site, which indicates that high stress concentration on the edge of the sample was the main cause for the generation of micro-crack.…”

Section: Fatigue Crack Initiation and Early Propagation Pathmentioning

confidence: 62%

Effect of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy

Zhang

Liang

et al. 2020

Mater. Res. Express

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The effects of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy were explored to further reveal its fatigue behavior and improve the damage tolerance. Fatigue life was investigated on 2198-T3 alloy after pre-deformation and aging treatments. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to study the fracture morphology, precipitation behavior, fatigue crack initiation and propagation. Results indicated that T 1 (Al 2 CuLi) phase dominated the strengthening of 2198-T3 alloy after the further aging. Pre-deformation increased the number of dislocations in the matrix, which provided favorable position for nucleation of T 1 . The precipitation of θ′ (Al 2 Cu) and δ′ (Al 3 Li) were inhibited. Also, the formation and coarsening of precipitate-free zone (PFZ) were effectively avoided in this condition. Dislocation density in the 2198 Al-Li alloy matrix increased with the amount of pre-deformation, leading to an increase in microcrack defects on the surface and inside alloy. As a result, decreased fatigue life and an increased crack growth rate of the alloy were observed. Overall, 2198 Al-Li alloy had the best fatigue life and damage tolerance enhancement after it underwent 3% pre-deformation and was aged at 155°C for 15 h.

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Section: Fatigue Crack Initiation and Early Propagation Pathmentioning

confidence: 62%

Effect of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy

Zhang

Liang

et al. 2020

Mater. Res. Express

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“…where σ B0 denotes the strengthening effect of matrix and grain boundaries before the aging process; and σ c denotes the strengthening effect induced by the precipitated phases that are coherent or semi-coherent with the matrix, such as δ and σ phases [10,28], where the strengthening can be regarded as the strengthening effect on the aluminum matrix. σ SS0 denotes the solution strength in the alloy before aging, and ∆σ SS denotes the decrease in solution strength during aging.…”

Section: Yield Strength Modellingmentioning

confidence: 99%

“…Because of the large number of alloying elements, Al-Cu-Li alloys have a relatively complex precipitation sequence [5]. The T 1 phase precipitated during the aging process is a plate-like precipitated phase with {111} plane as the habit plane, and the θ phase is a plate-like precipitated phase with {001} as the habit plane [6,7], accompanied by a small amount of δ and σ phases [8][9][10]. Considering the complex microstructure as a mixture of several precipitated phases, it is especially difficult to perform strength evaluations.…”

Section: Introductionmentioning

confidence: 99%

Quantification and Modelling of the Multiphase-Coupled Strengthening Effect in Al-Cu-Li Alloy

Zhang

et al. 2019

Metals

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After aging heat treatment, Al-Cu-Li alloy, in general, contains a variety of precipitated phases that jointly influence the age-strengthening effect on the alloy. In this work, a multiphase-coupled strengthening model has been established on the basis of a dislocation bypassing mechanism. The model considered situations with different proportions of two strengthening phases, T1 and θ′, and then obtained the dimension and volume fractions of these two strengthening phases via experiments. The values predicted by the multiphase-coupled strengthening model and the classical strengthening superposition model were compared with the measured results. The multiphase-coupled strengthening model established in this work had better consistency with the measured results. Moreover, the modeling method proposed in the paper can also be extended to the system having over two primary strengthening phases. Hence, the model can contribute towards the development of a multi-component precipitation strengthening process for aluminum alloys.

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“…The mechanical and corrosion properties of Al-Cu-Li alloys are related to intermetallic phases such as the T series (Al 2 CuLi, T 1 ; Al 5 CuLi 3 , T 2 ; Al 7 Cu 4 Li, TB), δ (Al 3 Li) and θ (Al 2 Cu) precipitates. The distribution and size of these precipitates are significantly influenced by thermo-mechanical processing [4,5]. The T 1 phase is the primary strengthening precipitate in Al-Cu-Li alloys (such as the 2195, 2050 and 2090 alloys).…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

Deng

Chen

2020

Materials

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The influences of aging treatments on microstructures and the corrosion properties of an Al–Cu–Li alloy were investigated through an immersion test in intergranular corrosion (IGC) solutions, a potentiodynamic polarization test, and electrochemical impedance spectra (EIS), combined with scanning and transmission electron microscopy. The results demonstrated that the Al–Cu–Li alloy displayed outstanding comprehensive mechanical properties and IGC resistance after treating with pre-strain deformation and a double aging process (PDA). Both the PDA and pre-strain followed by creep aging (PCA) treatments significantly increased the number densities of T1 and θ’ precipitates in the grain interior. The increase in precipitates in the grain interior greatly reduced the Cu-rich precipitates on the grain boundaries and inhibited the formation of a precipitate-free zone (PFZ). The electrochemical characteristics of the Al–Cu–Li alloy were influenced by the precipitates in the grain interior and grain boundaries. The studied alloy gained high IGC resistance due to the refinement of its microstructure, and the main corrosion mode was intra-granular pitting corrosion; thus, the corrosion diffusion rate was slowed down.

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Effect of Different Aging Processes on the Microstructure and Mechanical Properties of a Novel Al–Cu–Li Alloy

Cited by 84 publications

References 26 publications

Effect of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy

Effect of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy

Quantification and Modelling of the Multiphase-Coupled Strengthening Effect in Al-Cu-Li Alloy

Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

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