Effect of Iron and Silicon on the Phase Composition and Microstructure of the Al–2% Cu–2% Mn (wt %) Cold Rolled Alloy

Белов, Н. А.; Cherkasov, S. O.; Короткова, Н. О.; Yakovleva, A. O.; Tsydenov, Kirill

doi:10.1134/s0031918x2111003x

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…As a result, the plastic deformation covers a much larger volume, which leads to the formation of deep dimples (Figure 9). As follows from previous works on Al-Cu-Mn system alloys in the concentration range considered [18][19][20][21][22][23], annealing at 400 °C and higher temperatures makes it possible to obtain a close-to-equilibrium state. Therefore, appropriate calculations of the phase composition were carried out for the test alloys.…”

Section: Discussionmentioning

confidence: 73%

Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy

Belov,

Akopyan,

Tsydenov

et al. 2023

Metals

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The effects of Fe-bearing phases on the structure, mechanical properties, and fracture mechanism of a non-heat-treatable model sheet alloy (wt.%: Al–2%Cu–1.5%Mn(-Mg,Zn)), designed for Al20Cu2Mn3 dispersoids, was investigated. This involved a combination of thermodynamic modeling in the Thermo-Calc program and experimental studies of structure and mechanical properties. It has been shown that the addition of 0.5 and 0.4% iron and silicon leads to the formation of eutectic inclusions in the Al15(Mn,Fe)3Si2 phase. In addition to the Fe- bearing inclusions, the formation of the eutectic Al2Cu and Al2CuMg phases can be expected in the as-cast structure of the experimental alloys. Despite their relatively high fraction of eutectic particles, non-homogenized alloy ingots demonstrated sufficiently high deformation processability during the hot (400 °C) and cold rolling, which made it possible to obtain high-quality sheet alloys (with reduction degrees of 80 and 75%, respectively). The results of the tensile tests revealed that, after cold rolling, the addition of 1% Mg significantly increased the tensile and yield strengths, whereas the effect of 1% Zn was negligible. At the same time, the uniform distribution of Fe-bearing phases in the structure of the cold-rolled sheets contributes to the preservation of the dimple mechanism of the fracture toughness. This helps to maintain the same level of ductility for the cold-rolled sheet Fe-containing alloys as for Fe-free alloys. It has been shown, based on the data obtained, that adding Fe, Si, Mg, and Zn to the base Al–2%Cu–1.5%Mn alloy in a total amount of more than 3% makes it possible to retain the ductile fracture patterns of the base alloy and obtain a fairly higher level of mechanical properties. This suggests the fundamental possibility of using a variety of secondary raw materials (containing the main elements present in aluminum alloys of different alloying systems) to prepare a base alloy that does not require homogenization or thermal hardening.

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Section: Discussionmentioning

confidence: 73%

Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy

Belov,

Akopyan,

Tsydenov

et al. 2023

Metals

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“…The alloy of this chemical composition has high strength and ductility, and its processability is higher than that of standard alloys due to the fact that there is no need for any additional heat treatment. The authors of this alloy composition have also studied the possibility of its alloying with Zr [5], Fe and Si [6,7], as well as with Mg and Zn [8].…”

Section: Introductionmentioning

confidence: 99%

Simulation of taper heating and variable pressing rate to improve extrusion performance for high-strength aluminum alloys

Danilin,

Aleshchenko,

Danilin

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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The main process parameters of direct and indirect extrusion of aluminum alloys were studied using FE-modeling in this article. The subject of the study was the use of billets taper heating and variable pressing rate as compared to the standard extrusion conditions. Extrusion of AA2024 grade alloy and experimental Al-2%Cu-1.5%Mn-1%Mg-1%Zn alloy was considered. The flow stress-on-strain dependences within the 350 °C–450 °C range at strain rates of 0.1–10 s−1 were determined for the experimental alloy. Considering the time of billet transportation to the extrusion equipment, its optimum temperature gradient was determined to be 500 °C at the front end and 140 °C at the tail end. Direct extrusion of taper heated billets at the variable rate and elongation of 7 allowed increasing the process performance by 5.6 times (from 1.8 mm s−1 to an average of 10 mm s−1, in case uniformly heated billets are extruded at the constant rate). In case of pressing at high elongations (15 and 25), the performance increase was about 2 times. It was found that the use of taper heating, both in case of grade alloy and model alloy extrusion, in all the considered conditions, allows achieving a significant increase in performance. However, these results are considered to be most effective in case of direct extrusion at small elongation ratios.

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“…One should however bear in mind the high cost of Sc generally limiting its use as an alloying additive [24,25]. Other works [26][27][28][29] dealt with the effect of Si and Fe on the phase composition of Al-Cu-Mn alloys after different types of deformation and heat treatment. It was found that small additions of those elements (up to 0.4%) favor the precipitation of the Al 15 (Fe,Mn) 2 Si 3 (Al 15 ) and Al 6 (Fe,Mn,Cu) (Al 6 ) phases which decelerate the development of recrystallization processes in the alloy structure during long-term exposure to elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Optimization of flat rolling parameters for thermally stable alloy of Al-Cu-Mn system with micro additions of Si and Zr

Koshmin,

Cherkasov,

Fortuna

et al. 2023

Preprint

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The phase composition, microstructure and mechanical properties of flat-rolled experimental Al-Cu-Mn system alloy with Si and Zr additions have been studied. The experimental results have been compared with data for the AA2219 commercial alloy pertaining to the same alloying system. Hot deformation of experimental alloy causes the precipitation of ~ 100 nm sized dispersoids and refinement of the eutectic phase particles. The yield strength and relative elongation of the hot-deformed experimental alloy are 255 MPa and 8.6%, respectively. Subsequent cold deformation reduces the relative elongation by 3.5% and increases the yield strength by 50 MPa, while the ultimate tensile strength does not change. After long-term 350°C exposure the mechanical properties of the experimental alloy remain the same as those of the as-deformed one, whereas the yield strength of the 2219 alloy decreases by 2 times and the ultimate tensile strength, by 1.4 times. Comparison of these experimental results with data for the 2219 alloy and other Al-Cu-Mn system alloys cited in this work and reported elsewhere suggests that a good thermal stability of Al-2Cu-2Mn-0.4Si-0.2Zr alloy rolled stock can be achieved by treatment in the regimes designed herein.

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Effect of Iron and Silicon on the Phase Composition and Microstructure of the Al–2% Cu–2% Mn (wt %) Cold Rolled Alloy

Cited by 9 publications

References 23 publications

Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy

Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy

Simulation of taper heating and variable pressing rate to improve extrusion performance for high-strength aluminum alloys

Optimization of flat rolling parameters for thermally stable alloy of Al-Cu-Mn system with micro additions of Si and Zr

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