Effect of aging time on the microstructure evolution and mechanical property in an Al-Cu-Li alloy sheet

Jiang, Bo; Cao, Fuhua; Wang, Haisheng; Yi, Danqing; Jiang, Yong; Shen, Fanghua; Wang, Bin; Liu, Huiqun

doi:10.1016/j.msea.2018.10.064

Cited by 61 publications

(15 citation statements)

References 37 publications

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“…12a, which consists of elongated, strip-like grains with 24.3 ± 13.8 µm in width aligned in the direction of extrusion, and coarse second-phases distributed along the grain boundaries. The average width of strip-like grains in the alloy cast by LFEC with 10 Hz/150A decreases to 13.1 ± 10.1 µm as [27,28]. In this study, the morphologies of θ′ phases and T 1 phases in 2195 alloy cast by DCC and LFEC after T6 treatment were observed by TEM as in Fig.…”

Section: Effect Of Lfec On Microstructure Of 2195 Aged Alloysmentioning

confidence: 63%

“…It is well known that the dislocations, grain boundary, and intra-granular alloy elements are related with the nucleation and precipitation for T 1 and θ′ phase, and the growth of T 1 and θ′ phase is of long term controlled diffusion mechanism relying on the atoms diffusion [28][29][30][31][32]. On the one hand, according to the discussion in Sect.…”

Section: Effect Of Lfec On Microstructure Of 2195 Aged Alloysmentioning

confidence: 97%

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Low Frequency Electromagnetic Casting of 2195 Aluminum–Lithium Alloy and Its Effects on Microstructure and Mechanical Properties

Wang

Sun

Fang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this study, the low frequency electromagnetic casting (LFEC) technology was adopted to fabricate 2195 Al-Li alloy. The microstructure and solid solubility of as-cast 2195 alloys, as well as the second phase precipitation and tensile properties after aging, were investiagated and compared with the counterpart direct chill casting 2195 alloy. Our results indicate that LFEC can significantly improve the microstructure and metallurgical quality of as-cast alloy, and increase the number density of θ′ (Al 2 Cu) and T 1 (Al 2 CuLi) phases during aging treatment due to the enhanced solubilities of alloying elements. The tensile properties of 2195 aged alloy cast by LFEC were hence improved evidently.

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Section: Effect Of Lfec On Microstructure Of 2195 Aged Alloysmentioning

confidence: 63%

Section: Effect Of Lfec On Microstructure Of 2195 Aged Alloysmentioning

confidence: 97%

Low Frequency Electromagnetic Casting of 2195 Aluminum–Lithium Alloy and Its Effects on Microstructure and Mechanical Properties

Wang

Sun

Fang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…In a microstructure study of a similar Al-Li-X alloy, Jiang et al [91] reported a T 1 precipitates coarsening reduced rate and even a dissolution process of the two other alloy characteristic θ and δ phases for prolonged aging times. Anyhow, in the present case, the occurrence of these two microstructure phenomena did not occur, due to a combined effect of pre-deformation and aging that was not as drastic as a prolonged aging duration.…”

Section: Discussionmentioning

confidence: 99%

High-Temperature Equal-Channel Angular Pressing of a T6-Al-Cu-Li-Mg-Ag-Zr-Sc Alloy

Cabibbo

Paoletti

2021

JMMP

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Equal-channel angular pressing (ECAP) is known to induce significant grain refinement and formation of tangled dislocations within the grains. These are induced to evolve to form low-angle boundaries (i.e., cell boundaries) and eventually high-angle boundaries (i.e., grain boundaries). On the other hand, the precipitation sequence of age hardening aluminum alloys can be significantly affected by pre-straining and severe plastic deformation. Thus, ECAP is expected to influence the T6 response of aluminum alloys. In this study, a complex Al-Cu-Mg-Li-Ag-Zr-Sc alloy was subjected to ECAP following different straining paths. The alloy was ECAP at 460 K via route A, C, and by forward-backward route A (FB-route A) up to four passes. That is, ECAP was carried out imposing billet rotation between passes (route A), billet rotation by +90° between passes (route C), and billet rotation by +90° and inversion upside down between passes (FB-route A). The alloy was also aged at 460 K for different durations after ECAP. TEM microstructure inspections showed a marked influence of the different shearing deformations induced by ECAP on the alloy aging response. The precipitation kinetics of the different hardening secondary phases were affected by shearing deformation and tangled dislocations. In particular, the T1-Al2CuLi phase was the one that mostly showed a precipitation sequence speed up induced by the tangled dislocations formed during ECAP. The T1 phase was found to grow with aging time according to the Lifshitz-Slyozov-Wagner low-power regime.

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“…Meanwhile, the shear strain of the θ′ is at (001) α /[100] α , while the shear strain of the T 1 is at (111) α /[112] α . Because the shear strain for T 1 is in the plane of the Burgers vector of dislocation in the aluminum matrix, i.e., (111) α planes, dislocations may thus have a greater effect on T 1 nucleation than that on θ′ nucleation [28][29][30][31]. In addition, both T 1 and θ′ exhibit similar interfacial energy [32].…”

Section: Phase Precipitation Behavior Analysismentioning

confidence: 99%

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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Effect of aging time on the microstructure evolution and mechanical property in an Al-Cu-Li alloy sheet

Cited by 61 publications

References 37 publications

Low Frequency Electromagnetic Casting of 2195 Aluminum–Lithium Alloy and Its Effects on Microstructure and Mechanical Properties

Low Frequency Electromagnetic Casting of 2195 Aluminum–Lithium Alloy and Its Effects on Microstructure and Mechanical Properties

High-Temperature Equal-Channel Angular Pressing of a T6-Al-Cu-Li-Mg-Ag-Zr-Sc Alloy

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

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