Superplasticity of clad aluminium alloy

Mikhaylovskaya, A. V.; Mochugovskiy, A.G.; Котов, А. Д.; Yakovtseva, O. A.; Gorshenkov, M.V.; Portnoy, V.K.

doi:10.1016/j.jmatprotec.2016.12.025

Cited by 14 publications

(9 citation statements)

References 27 publications

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“…The AA3003 and AA4045 alloys used in the present work went through a number of processing stages, namely the preparation of stack (sandwich or pack), reheating (soaking), hot roll-bonding, annealing, cold-rolling, and annealing, as illustrated in Figure 2 [11]. The packs of AA4045/AA3003 were heated from room temperature at a heating rate of 60 • C/h up to the soaking temperature of 505 • C (±5 • C).…”

Section: Methodsmentioning

confidence: 99%

The Effect of Soaking Time on Mechanical Properties of Roll-Bonded AA3003 and AA4045 Used for Heat Exchangers

Moema,

Siyasiya,

Morudu

et al. 2023

Metals

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Due to the rising need for energy saving, high-performing automotive heat exchangers, demand has significantly grown in recent years. As a result, effective fin-tube heat exchangers are becoming more popular. These tubes are typically made by rolling flat strips of AA3003 aluminum alloys that have either one or both sides coated with AA4xxx alloys. The AA3003 type of alloy is typically used as the core, which is then covered in either AA4045 or AA4343, which melts during the brazing process to adhere the fins to the tubes. To maintain the optimal size and distribution of manganese (Mn)-containing precipitates, preheating parameters are carefully controlled. Then, longer soaking times or higher soaking temperatures result in larger precipitates, which cause the final product to exhibit poor mechanical properties. Therefore, it is crucial to optimize the different manufacturing steps, such as homogenization, soaking time, and brazing in order to achieve a high quality product. Studies on the impact of homogenization temperature and time on the microstructure of AA3xxx aluminum alloys have been conducted. However, there has been little research on the impact of soaking (reheating) time on AA3003 cladded alloys. Hence, the effects of isothermal soaking time on the microstructure and mechanical properties of AA3003 cladded with AA4045 alloy were investigated in this work. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to characterize the microstructure and identify intermetallic phases. The final microstructure in terms of grain structure at various homogenization times was characterized by electron backscattered diffraction (EBSD). After the hot-rolling and cold-rolling of the as-received material, large particles of intermetallic (mainly in the form of Chinese script morphology consisting of Fe-Mn-Si) were broken into smaller particles with an increased Fe, Mn, and Si content, indicating the formation of an α-Al(Fe,Mn)Si phase. The α-Al(Mn,Fe)Si was found to be a dominant dispersoid precipitate in the modified AA3003 core. Coarsening of the Al(Mn,Fe)Si dispersoids at 505 °C was only observed at a 45 h homogenization time. The hardness trend with homogenization time was found to be similar to that after homogenization, cold working, and annealing, with exception of an increase in hardness in the latter possibly due to strain hardening (from cold-rolling).

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Section: Methodsmentioning

confidence: 99%

The Effect of Soaking Time on Mechanical Properties of Roll-Bonded AA3003 and AA4045 Used for Heat Exchangers

Moema,

Siyasiya,

Morudu

et al. 2023

Metals

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“…The aluminum-cladded sheet for braze application in the automotive industry is typically a (sandwich) structure with two or more layers, where the clad sheets are bonded to the core alloy on one or more surfaces [6]. The most common alloy combinations for cladding are EN AW 3003 with EN AW 4343 [7] or any other modified 3xxx or 4xxx aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

Cold Rolling Technology Optimization for EN AW 4343/3003/4343 Cladded Aluminum Alloys and Influence of Parameters on Microstructure, Mechanical Properties and Sustainable Recyclability

Kropf,

Cvahte,

Arzenšek

et al. 2024

Metals

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The present study investigates the accumulative roll bonding process applied to the EN AW 3003 aluminum alloy, serving as a composite material on both sides and consisting of the EN AW 4343 aluminum alloy. For the characterization of the optical microscopy, corrosion tests with saltwater acetic acid and mechanical properties before and after the braze test were employed. The numerical simulations accurately predicted the industrial cold rolling values for the rolling force and surface temperature. The most comprehensive understanding of the cold rolling parameters for both side-cladded materials was achieved by combining predictions for cladded and uncladded materials. The thickness of the cladded layer presented as a percentage after roll bonding was 18.7%. During the cold rolling and annealing, the cladded thickness was increased to 24.7% of the final 0.3 mm of the total cold-rolled product thickness. According to the performed braze test for final thickness, the ultimate tensile strength and yield strength were decreased, and the elongation increased to 18.1%. In addition to the described changes in mechanical properties, the material’s anisotropy improved from 5.4% in the cold-rolled condition to 2.0% after the braze test. After multiple re-meltings of the cladded material, the analyzed chemical compositions allow for recycling and reuse as different 4xxx, 5xxx, and 6xxx alloys.

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“…Such coarse particles may precipitate during heterogenization treatment from a solid solution supersaturated by Mg, Zn, Si, Cu [ 14 , 16 , 23 ], and precipitate during solidification due to alloying with eutectic forming elements, such as Ni, Fe, Mn, Ce [ 24 , 25 , 26 , 27 ]. Nickel is a promising alloying element for increasing the superplasticity of Al-based alloys [ 24 , 26 , 27 , 28 , 29 , 30 ]. The homogeneous distribution of the coarse Al 3 Ni particles with a near-spherical morphology is formed in the alloys’ sheets during a simple thermomechanical treatment [ 26 , 27 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…In novel alloys, the additions of Sc, as an expensive element, are reduced to 0.1 wt.%, while that of Zr is retained in a higher amount, 0.2 wt.% [ 32 , 49 , 50 ]. The bimodal distribution of the particles in the alloy’s structure provides a high strain rate superplasticity with strain rate sensitivity coefficient m above 0.3 for the AA5XXX- [ 24 , 30 , 51 ], AA7XXX- [ 29 , 30 , 42 , 52 ] and AA2XXX-types [ 27 , 34 ] alloys containing eutectic- and dispersoid-forming Fe [ 24 ], Ni [ 24 , 27 , 29 , 52 ], Ce [ 25 , 27 , 53 ], Y [ 34 ], Er [ 51 ], Mn [ 54 , 55 ], Cr [ 55 ], Zr [ 30 , 56 , 57 ], Sc [ 58 , 59 , 60 , 61 ]. The influence of the eutectic-forming and dispersoid-forming elements on the grain structure and superplastic deformation behavior of Al-Mg-Si type alloys is poorly studied.…”

Section: Introductionmentioning

confidence: 99%

A High-Strain-Rate Superplasticity of the Al-Mg-Si-Zr-Sc Alloy with Ni Addition

et al. 2021

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The current study analyzed the effect of Ni content on the microstructure and superplastic deformation behavior of the Al-Mg-Si-Cu-based alloy doped with small additions of Sc and Zr. The superplasticity was observed in the studied alloys due to a bimodal particle size distribution. The coarse particles of eutectic origin Al3Ni and Mg2Si phases with a total volume fraction of 4.0–8.0% and a mean size of 1.4–1.6 µm provided the particles with a stimulated nucleation effect. The L12– structured nanoscale dispersoids of Sc- and Zr-bearing phase inhibited recrystallization and grain growth due to a strong Zener pinning effect. The positive effect of Ni on the superplasticity was revealed and confirmed by a high-temperature tensile test in a wide strain rate and temperature limits. In the alloy with 4 wt.% Ni, the elongation-to-failure of 350–520% was observed at 460 °C, in a strain rate range of 2 × 10−3–5 × 10−2 s−1.

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Superplasticity of clad aluminium alloy

Cited by 14 publications

References 27 publications

The Effect of Soaking Time on Mechanical Properties of Roll-Bonded AA3003 and AA4045 Used for Heat Exchangers

The Effect of Soaking Time on Mechanical Properties of Roll-Bonded AA3003 and AA4045 Used for Heat Exchangers

Cold Rolling Technology Optimization for EN AW 4343/3003/4343 Cladded Aluminum Alloys and Influence of Parameters on Microstructure, Mechanical Properties and Sustainable Recyclability

A High-Strain-Rate Superplasticity of the Al-Mg-Si-Zr-Sc Alloy with Ni Addition

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