Effects of d.c. current on the phase transformation in 7050 alloy during homogenization

Jia, Peng; Cao, Yi; Geng, Yan; He, Lizi; Xiao, Na; Chen, Jianzhong

doi:10.1016/j.matchar.2014.07.017

Cited by 20 publications

(5 citation statements)

References 38 publications

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“…grain boundaries) [34]. In principle, the soluble constituents can dissolve into the matrix by suitable homogenisation treatment [35]. Due to the uneven composition of the alloy, a large amount of Al 2 CuMg phases was distributed at grain boundaries and inside grains prior to homogenisation treatment.…”

Section: Resultsmentioning

confidence: 99%

The evolution of Al₂CuMg phase during two-stage homogenisation for 7055 aluminium alloy

Guo

et al. 2023

Materials Science and Technology

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In this paper, the effect of two-stage homogenisation treatment on the evolution of the second phase was investigated. The microstructure of the extruded 7055 aluminium alloy was composed of α(Al) matrix and other second phases, including MgZn2, Al2CuMg, and Al7Cu2Fe phases. The segregation of second phase was serious and the content was 27.9%. During the 460°C × 24 h homogenisation, MgZn2 phases dissolved quickly, but there was still a significant amount of Al2CuMg phases present. After two-stage homogenisation (460°C × 24 h + 480°C × 10 h), the content of Al2CuMg phase decreased from 15% to 3% and the degree of segregation was reduced. In addition, the mechanical properties of the extruded 7055 alloy were effectively improved.

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Section: Resultsmentioning

confidence: 99%

The evolution of Al₂CuMg phase during two-stage homogenisation for 7055 aluminium alloy

Guo

et al. 2023

Materials Science and Technology

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“…3c and 3e). This is due to the diffusion transport of Li from the aluminum dendrites to the interdendritic region with the increase of Li during the near-rapid solidification process [24][25][26] . The measurement results and statistics of the densities of alloys and the volume fraction of precipitated phases in the alloys with different Li contents are shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Microstructural evolution of Al-Cu-Li alloys with different Li contents by coupling of near-rapid solidification and two-stage homogenization treatment

Luo

Xia

et al. 2020

China Foundry

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A t present, Al-Li alloys, owing to their light weight, recyclability, high strength, hardness, and elastic modulus, have gradually become potential structural materials applied in aerospace and other fields [1][2][3][4][5] . Related studies have shown that every 1% addition of Li content can effectively reduce the density about 3% and increase the elastic modulus around 6% in Al-Li alloys [6,7] . However, when Li content increases too much, many adverse effects will be produced, such as drastic anisotropy and element segregation. In this case, under the solution and aging treatment, the refined δ' phases are consumed, and the coarse δ phases will be accumulated at the grain boundaries, which seriously reduces the fracture toughness of the alloys [8] . At present, the main methods for the purpose of improving

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“…The effects of electric and magnetic fields on ferromagnetic and non-ferromagnetic materials during the solidification and subsequent heat treatment have been confirmed [12]. For example, it has achieved good results in refining grains [13,14], reducing the shrinkage porosity defects in ingots and improving ingot quality [15,16], enhancing the cleanliness of microstructure [17], and promoting the distribution of precipitates [18,19].…”

Section: Introductionmentioning

confidence: 89%

Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

Wei

et al. 2021

Metals

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In this work, a Al-Cu-Li alloy plate with outstanding mechanical properties was successfully prepared with electromagnetic twin-roll casting (TRC) technology. The microstructure of Al-Cu-Li alloy manufactured by conventional mold casting, TRC, and electromagnetic TRC was studied in detail. The action mechanism of electromagnetic oscillation field (EOF) in the TRC process was studied by systematic experimental characterization and numerical simulation. The results show that the EOF will enlarge the circumfluence area in the cast-rolling zone, accelerate the mass transfer and heat transfer in the molten pool, and make the solute field and flow field in the liquid cavity tend to be evenly distributed. Further, the introduction of the EOF will produce the electromagnetic body force F with the maximum strength of 14 N/m3. The F acting on the solidification front will eliminate the accumulation and deposition of Cu2+, Li+, Mg2+, Zn2+, Mn2+ at the dendrite tip and inhibit the growth of dendrites. At the same time, the F can refine the microstructure of the TRC plate, promote the formation of equiaxed crystals, improve the supersaturated solid solubility of solute elements in the a(Al) matrix, and avoid the appearance of obvious solute segregation area or the formation of excessive solute enrichment area. Therefore, the macro-segregation in TRC plate was significantly reduced, the solidification structure was dramatically refined, and the comprehensive properties of the alloy were remarkably improved.

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Effects of d.c. current on the phase transformation in 7050 alloy during homogenization

Cited by 20 publications

References 38 publications

The evolution of Al₂CuMg phase during two-stage homogenisation for 7055 aluminium alloy

The evolution of Al₂CuMg phase during two-stage homogenisation for 7055 aluminium alloy

Microstructural evolution of Al-Cu-Li alloys with different Li contents by coupling of near-rapid solidification and two-stage homogenization treatment

Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

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Effects of d.c. current on the phase transformation in 7050 alloy during homogenization

Cited by 20 publications

References 38 publications

The evolution of Al2CuMg phase during two-stage homogenisation for 7055 aluminium alloy

The evolution of Al2CuMg phase during two-stage homogenisation for 7055 aluminium alloy

Microstructural evolution of Al-Cu-Li alloys with different Li contents by coupling of near-rapid solidification and two-stage homogenization treatment

Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

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The evolution of Al₂CuMg phase during two-stage homogenisation for 7055 aluminium alloy

The evolution of Al₂CuMg phase during two-stage homogenisation for 7055 aluminium alloy