The effect of pre-deformation on the precipitation behavior of AlCuMg(Si) alloys with low Cu/Mg ratios

Niu, F.J.; Chen, J.H.; Duan, S.Y.; Ming, W.Q.; Lu, Jiangbo; Wu, C.L.; Le, Zhichen

doi:10.1016/j.jallcom.2020.153831

Cited by 22 publications

(9 citation statements)

References 44 publications

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“…Typically, S and θ precipitated phases during the heat treatment process, which bring about reduction or elimination the coarse eutectic structure produced in the casting process, and excellent performance of the aluminum alloy products [ 14 , 18 , 19 , 20 , 21 ]. The reported results show that the general precipitation sequence of the S-phase in Al-Cu-Mg alloy is as follows [ 22 , 23 , 24 ]:

…”

Section: Introductionmentioning

confidence: 99%

The Effect of Extrusion and Heat Treatment on the Microstructure and Tensile Properties of 2024 Aluminum Alloy

Zhang

Wang

et al. 2022

Materials

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Hot extrusion forming is one of the best cost-effective processing methods to obtain high-strength aluminum alloys. In order to obtain high performance 2024 aluminum alloy for the aero and automobile industries, this research comprehensively uses heat treatment and reverse isothermal extrusion technology to prepare 2024 alloy. The effects of homogenization, extrusion and post-extrusion annealing treatment on the microstructure and mechanical properties of 2024 aluminum alloy were discussed in detail. The results indicate that the grain refinement of the extruded alloy material is significant. The coarse eutectic microstructure at the grain boundaries was refined, and these grains tended to be uniformly distributed after the annealing treatment. Extruded 2024 aluminum alloy material mainly has S (Al2CuMg) and Al7Cu2Fe second phases. The appearance of a large number of S phases led to a significant improvement in the properties of the alloy with an increase in tensile strength and elongation of 176% and 547%, respectively. In addition, EBSD analysis showed a significant meritocratic growth in the extrusion direction with the appearance of Copper {112} <111> rolling weaving, which led to process hardening and the strength improvement of the alloy.

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…”

Section: Introductionmentioning

confidence: 99%

The Effect of Extrusion and Heat Treatment on the Microstructure and Tensile Properties of 2024 Aluminum Alloy

Zhang

Wang

et al. 2022

Materials

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“…For T8 peak-aged samples, the zig-zag composite precipitates induced by dislocations become the main precipitates except for a small amount of Si-modified GPB zone. The zig-zag composite precipitates are confirmed to have a long-range disorder, whereas short-range ordered S phase, C phase and GPB zone are observed [17]. As the main constitute of the zig-zag composite precipitates, S phase always has a thickness of over 1.5 nm.…”

Section: T6 and T8 Tempersmentioning

confidence: 86%

“…Figure 3 displays the microstructure of the samples pre-aged at 200 °C for 1 h, in which the main precipitates are almost the precursors of needle-like Si-modified zones. It is worth noting that the precipitation sequence of the alloys pre-aged at 200 °C is as same as that of the alloys aged at 180 °C [17].…”

Section: Tmt Processesmentioning

confidence: 99%

“…It can be concluded that larger-sized and a smaller amount of precipitates are detrimental to the properties for aluminum alloys with age-hardenability. Therefore, the zig-zag composite precipitates of T8 samples are prone to coarsen and line up to longer than 100 nm, which results in the deterioration of hardness and tensile strength [17].…”

Section: T6 and T8 Tempersmentioning

confidence: 99%

“…Our previous study illustrated that the introduction of 6% pre-deformation results in the dislocation-induced precipitation of the zig-zag composite precipitate (CP) with a large size and decreases the number of Si-modified GPB zones [12]. So cold-rolling deformation of 6% prior to artificial aging leads to a degradation in the mechanical properties of an Al-Cu-Mg-Si alloy with a low Cu/Mg ratio compared to the alloys without pre-deformation [17]. To improve the mechanical properties, microstructure must be modified by reducing the amount of the zig-zag composite precipitates or tuning the zig-zag composite precipitates at a finer size.…”

Section: Introductionmentioning

confidence: 99%

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Improved Properties in Relation to Fine Precipitate Microstructures Tailored by Combinatorial Processes in an Al–Cu–Mg–Si Alloy

Niu

Chen

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The 2xxx series Al alloys have been widely used in aerospace industry owing to their high strength, good plasticity and superior formability. To ensure a good control of shape, the quenched alloy sheets require a small pre-deformation before artificial aging. However, this pre-deformation considerably deteriorates the mechanical strength of the Al-3.0Cu-1.8Mg-0.5Si (wt%) alloys due to the formation of unfavorable large-sized precipitates at dislocations. To tackle this issue, we designed a pre-aging process prior to the pre-deformation. The thermal-mechanical treatment, involving pre-aging, pre-deformation and subsequent aging, markedly enhanced the ultimate tensile strength up to 521 MPa compared to that (448 MPa) of the alloy without pre-aging. Microstructure characterization revealed that the fine precipitates (~ 2 nm) with a uniform dispersion were promoted within the Al matrix, which in turn partly suppressed the formation of the unfavorable large-sized precipitate (~ 100 nm). Our findings provide a new clue for designing stronger Al alloys with age-hardenability.

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Formation and development of Goss texture in Al–Cu–Mg alloy during solution treatment

Zhao,

Liu

2023

J Mater Sci

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The effect of pre-deformation on the precipitation behavior of AlCuMg(Si) alloys with low Cu/Mg ratios

Cited by 22 publications

References 44 publications

The Effect of Extrusion and Heat Treatment on the Microstructure and Tensile Properties of 2024 Aluminum Alloy

The Effect of Extrusion and Heat Treatment on the Microstructure and Tensile Properties of 2024 Aluminum Alloy

Improved Properties in Relation to Fine Precipitate Microstructures Tailored by Combinatorial Processes in an Al–Cu–Mg–Si Alloy

Formation and development of Goss texture in Al–Cu–Mg alloy during solution treatment

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