Microstructural evolution in twin roll cast AA3105 during homogenization

Sun, Naiyu; Patterson, Burton R.; Suni, Jaakko P.; Simielli, Eider Alberto; Weiland, Hasso; Allard, Lawrence F.

doi:10.1016/j.msea.2005.10.018

Cited by 65 publications

(24 citation statements)

References 12 publications

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“…Hot deformation of the semisolid material by the rolls fully consolidates the rapidly-solidified product. The high solidification rate in spray rolling allows a wider range of alloys to be processed, and at higher production rates, than is currently possible in commercial twin-roll casting practices [Gra05,Nai06,Yun00].…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution during spray rolling and heat treatment of 2124 Al

McHugh

Lin

Zhou

et al. 2008

Materials Science and Engineering: A

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Spray rolling is a strip-casting technology that combines elements of spray forming and twin-roll casting. It consists of atomizing molten metal with a high velocity inert gas, quenching the resultant droplets in flight, and directing the spray between mill rolls. In-flight convection heat transfer from atomized droplets and conduction heat transfer at the rolls rapidly remove the metal's latent heat. Hot deformation of the semi-solid material in the rolls results in fully consolidated, rapidly-solidified product. Spray rolling operates at a higher solidification rate than conventional twin-roll casting and is able to process a broader range of alloys at high production rates.A laboratory-scale strip caster was constructed and used to evaluate the interplay of processing parameters and strip quality for strips up to 200 mm wide and 1.6-6.4 mm thick. Plans are underway to scale to 600 mm width and demonstrate steady-state operation. This paper describes microstructure evolution during spray rolling. It also examines how the liquid content of the semi-solid material, and post-deposition thermo-mechanical processing, influence the microstructure and mechanical properties of spray-rolled 2124 Al.

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Section: Introductionmentioning

confidence: 99%

Microstructure evolution during spray rolling and heat treatment of 2124 Al

McHugh

Lin

Zhou

et al. 2008

Materials Science and Engineering: A

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“…[5,[13][14][15][16] Slower heating should allow more dispersoid precipitation on subgrain boundaries, preventing nucleation of recrystallization and resulting in a coarser recrystallized grain size. Typical scanning transmission electron microscopy (STEM) ( Figure 4) shows the interaction between precipitates and subgrain boundaries at the early stage of recrystallization in air-furnace-annealed TRC AA3105.…”

Section: Methodsmentioning

confidence: 99%

“…The supersaturated manganese can form fine a-Al(Mn,Fe)Si dispersoids during the imposed annealing after cold rolling to final thickness. These particles inhibit recrystallization by Zener pinning of subgrain boundaries, resulting in a coarse, elongated grain structure [4,5] giving material with poor formability. [6][7][8] The object of the study was to find a way to overcome the problem of the large grain size produced by the new process of twin roll casting with its inherent Mn supersaturation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heating Rate on Recrystallization of Twin Roll Cast Aluminum

Sun

Patterson

Suni

et al. 2007

Metall Mater Trans A

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The effect of heating rate on precipitation and recrystallization behavior in twin roll cast (TRC) AA3105 has been investigated by three different means: conventional air furnace, controlled infrared, and lead bath heating. Experimental results showed that as-recrystallized grain size decreased and became more equiaxed as the annealing heating rate increased. These results were explained via time-temperature-transformation (TTT) curves for both dispersoid precipitation and recrystallization. With the faster heating rate, recrystallization could occur before precipitation of Mn present in the unhomogenized TRC samples. At a heating rate of 50°C/s, the material underwent grain growth after recrystallization at 500°C. No sign of grain growth was observed in materials annealed with lower heating rates, 3°C/s, 0.5°C/s, and 0.01°C/s, due to greater dispersoid precipitation.

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“…The Al sheets exhibited excellent formability and mechanical properties, far exceeding those in commercially available Al sheets. Sun et al [10] homogenized the AA3105 alloy prior to cold rolling and annealing and found that homogenization reduced the supersaturation and coarsened the constituent particles, thus reducing the total number of particles. Homogenization also resulted in a marked reduction in the recrystallized grain size and faster recrystallization kinetics after cold rolling and annealing.…”

Section: Introductionmentioning

confidence: 99%

Improvement of AA5052 sheet properties by electromagnetic twin-roll casting

et al. 2015

Int J Adv Manuf Technol

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Electromagnetic fields were used in twin-roll casting (TRC) of aluminum alloy 5052 (AA5052) for improvement of the microstructure and mechanical properties. A static magnetic field induces an inhibiting effect on the melt in the cast-rolling area and reduces diffusion of the solutes. It also results in more nucleating opportunities and less segregation, thus enhancing the mechanical properties. However, the static magnetic field does not change the orientation of crystal growth and columnar crystals still exist in microstructure. On the other hand, an oscillating magnetic field can refine the suspended particles and induce strong convection. This leads to more uniform distribution of temperature and solute elements, simultaneously increasing nucleating opportunities and decreasing segregation, thereby enhancing the mechanical properties. An oscillating magnetic field also inhibits the orientation of crystal growth and makes finer and equiaxed grains.

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Microstructural evolution in twin roll cast AA3105 during homogenization

Cited by 65 publications

References 12 publications

Microstructure evolution during spray rolling and heat treatment of 2124 Al

Microstructure evolution during spray rolling and heat treatment of 2124 Al

Effect of Heating Rate on Recrystallization of Twin Roll Cast Aluminum

Improvement of AA5052 sheet properties by electromagnetic twin-roll casting

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