Annealing Effects in Twin-Roll Cast AA8006 Aluminium Sheets Processed by Accumulative Roll-Bonding

Cieslar, Miroslav; Šlapáková, Michaela

doi:10.3390/ma7128058

Cited by 9 publications

(4 citation statements)

References 23 publications

(25 reference statements)

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“…The softening behaviour of the homogenized AA8006 sheet processed by 6 ARB cycles, i.e. the onset of recrystallization at 250°C is similar to the results reported for the same homogenized alloy in [20] after 3 and 5 ARB cycles. Birol [21] also reported that homogenized TRC Al-Fe-Mn sheet starts to recrystallize at much lower temperature (250 -280°C) than the supersaturated unhomogenized one (400 -450°C) [14].…”

Section: Thermal Stabilitysupporting

confidence: 83%

Influence of homogenization on the microstructure, mechanical properties and texture of the twin-roll cast AA8006 sheet processed by accumulative roll-bonding

et al. 2020

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Unhomogenized and homogenized AA8006 (Al-Fe-Mn-Si) alloy sheets twin-roll cast to strip 8.5 mm thick, processed by accumulative roll-bonding (ARB) on 2 mm thick sheets up to 6 cycles were studied. The microstructure was characterized by means of scanning and transmission electron microscopy and electron backscattered diffraction (EBSD), mechanical properties were monitored by hardness measurements and tensile tests. The macroscopic texture was determined by X-ray diffraction. The initial texture of the unhomogenized sheet is rotated cubic {001}<110> combined with recrystallization R texture {011}<211>, while the homogenized sheet has a cubic texture {001}<100> with remaining rolling component C {112}<111>. One ARB cycle leads to the formation of low-angle grain boundaries (LAGB) in original coarser grains and to a low angle rotation of the subgrains bounded by LAGB. After the 3rd and 6th ARB cycle unhomogenized and homogenized sheets show a common rolling texture of cold-rolled aluminium. The thermal stability of sheets processed by 6 ARB cycles was tested by isochronal annealing for 30 min up to 450°C. The homogenized sheet starts to recrystallize at 250°C, while the fine grain structure of the unhomogenized sheet is thermally stable up to 400°C.

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Section: Thermal Stabilitysupporting

confidence: 83%

Influence of homogenization on the microstructure, mechanical properties and texture of the twin-roll cast AA8006 sheet processed by accumulative roll-bonding

et al. 2020

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“…Recently, techniques such as equal channel angular pressing [19,20], high-pressure torsion [21], accumulative roll bonding [22,23], repetitive corrugation and strengthening [24], and constrained groove pressing (CGP) [25] have been used to produce ultrafine-grained (UFG) materials. They were also successfully used to process high alloyed Al-Cu-Li materials [13,[26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Near Net Shape Manufacturing of Sheets from Al-Cu-Li-Mg-Sc-Zr Alloy

Kihoulou,

Králík,

Bajtošová

et al. 2024

Materials

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Thin twin-roll cast strips from a model Al-Cu-Mg-Li-Zr alloy with a small addition of Sc were prepared. A combination of a fast solidification rate and a favorable effect of Sc microalloying refines the grain size and the size of primary phase particles and reduces eutectic cell dimensions to 10–15 μm. Long-term homogenization annealings used in conventionally cast materials lasting several tens of hours followed by a necessary dimension reduction through rolling/extruding could be substituted by energy and material-saving procedure. It consists of two-step short annealings at 300 °C/30 min and 450 °C/30 min, followed by the refinement and hardening of the structure using constrained groove pressing. A dense dispersion of 10–20 nm spherical Al3(Sc,Zr) precipitates intensively forms during this treatment and effectively stabilizes the structure and inhibits the grain growth during subsequent solution treatment at 530 °C/30 min. Small (3%) pre-straining after quenching assures more uniform precipitation of strengthening Al2Cu (θ′), Al2CuMg (S′), and Al2CuLi (T1) particles during subsequent age-hardening annealing at 180 °C/14 h. The material does not contain a directional and anisotropic structure unavoidable in rolled or extruded sheets. The proposed procedure thus represents a model near net shape processing strategy for manufacturing lightweight high-strength sheets for cryogenic applications in aeronautics.

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“…Although TRC aluminium alloy sheets and foils are optimal candidates for further cold rolling reduction process, there is no available data on an influence of CRR rates on TRC 8006 aluminium alloy's corrosion properties. Also, corrosion characteristics of various aluminium alloys produced by TRC resulting surface roughness profiles has been subjected to attention for the past decades because of its importance in pitting corrosion resistance [2,6,13,15]. The present work is aimed to study the effect of cold rolling reduction rate as that achieved during the twin-roll casting process, on corrosion behaviour of 8006 aluminium alloys in 1M NaCI aqueous solution environment.…”

Section: Introductionmentioning

confidence: 99%

“…8006 aluminium alloys are widely used for manufacturing the packaging foils and sheets for common heat exchanger applications [13,14]. Increasing demands of the industry on corrosion resistance, mechanical properties and formability has evoked an intensive investigation of sheets and foils with an influence of cold rolling reduction rate [15][16][17]. Although TRC aluminium alloy sheets and foils are optimal candidates for further cold rolling reduction process, there is no available data on an influence of CRR rates on TRC 8006 aluminium alloy's corrosion properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cold Rolling Reduction Rate on Corrosion Behaviour of Twin-roll Cast 8006 Aluminium Alloys

Küçük

2018

Cumhuriyet Science Journal

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Utilization of aluminum alloys in the automotive industry takes a crucial role in recent years due to their excellent properties such as corrosion resistance and light weight. 3003 and 8006 aluminum alloys have been particularly used as a heat exchanger compartment due to their corrosion resistance feature which has a perfect match for a heat exchanger fin stocks and a destructive salty environment in this car's part. In the present work, an effect of cold rolling reduction (CRR) rate on the corrosion twin-roll cast 8006 aluminium alloys was investigated. Firstly, the aluminium alloy was submitted to twin-roll casting process to achieve 8.5 mm thickness sheet. Then, homogenization annealing was applied between 550 °C and 600 °C. Subsequently, two cold rolling routes were subjected at different CRR rates of 94% and 98%, respectively. Finally, the aluminium sheets were annealed between 400 °C and 450 °C for 60 min. in a furnace for electrochemical corrosion tests. Electrochemical corrosion tests were performed in 1 M NaCl and H2O2 solution, and open circuit potential and polarization curves were successfully achieved. The surface features of the specimens before and after corrosion tests were assessed using stereomicroscopy and 3D profilometer. Based on the results, an increase in the various CRR rates depending on cold rolling route applied decreases the corrosion resistance of the twin-roll cast 8006 aluminum alloys. Thus, they could be very versatile materials for heat exchanger fin stock materials.

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Annealing Effects in Twin-Roll Cast AA8006 Aluminium Sheets Processed by Accumulative Roll-Bonding

Cited by 9 publications

References 23 publications

Influence of homogenization on the microstructure, mechanical properties and texture of the twin-roll cast AA8006 sheet processed by accumulative roll-bonding

Influence of homogenization on the microstructure, mechanical properties and texture of the twin-roll cast AA8006 sheet processed by accumulative roll-bonding

Near Net Shape Manufacturing of Sheets from Al-Cu-Li-Mg-Sc-Zr Alloy

Effect of Cold Rolling Reduction Rate on Corrosion Behaviour of Twin-roll Cast 8006 Aluminium Alloys

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