Title

A COMPARISON BETWEEN ASYMMETRIC ROLLING AND ACCUMULATIVE ROLL BONDING AS MEANS TO REFINE THE GRAIN STRUCTURE OF AN Al-Mg-Si ALLOY

A COMPARISON BETWEEN ASYMMETRIC ROLLING AND ACCUMULATIVE ROLL BONDING AS MEANS TO REFINE THE GRAIN STRUCTURE OF AN Al-Mg-Si ALLOY

Authorship

Angella, G.; Dellasega, David; Farè, S.; Vedani, M.

Angella, G.

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Dellasega, David

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Farè, S.

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Vedani, M.

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DOI

10.5151/2594-5327-34988

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Abstract

The possibility of refining the grain structure of a commercial Al-Mg-Si alloy was evaluated using asymmetric rolling (ASR) and accumulative roll bonding (ARB) in the severe plastic deformation (SPD) regime. Bars of annealed alloy having a thickness of 10 mm were asymmetrically rolled down to a thickness of 0,23 mm with a laboratory rolling mill featuring the possibility of independently modifying the rotational speed of its two rolls. The effect of the rolling temperature was investigated by tests in the range 150- 250 °C. A parallel campaign was also conducted to investigate the effects of warm accumulative roll bonding of the same alloy and in the same temperature range. These tests were carried out on annealed samples of 1 mm thickness. The experimental characterization (both mechanical and microstructural) demonstrated that asymmetric rolling and accumulative roll bonding can readily promote the achievement of ultrafine grained structures in Al-Mg-Si alloys.

The possibility of refining the grain structure of a commercial Al-Mg-Si alloy was evaluated using asymmetric rolling (ASR) and accumulative roll bonding (ARB) in the severe plastic deformation (SPD) regime. Bars of annealed alloy having a thickness of 10 mm were asymmetrically rolled down to a thickness of 0,23 mm with a laboratory rolling mill featuring the possibility of independently modifying the rotational speed of its two rolls. The effect of the rolling temperature was investigated by tests in the range 150- 250 °C. A parallel campaign was also conducted to investigate the effects of warm accumulative roll bonding of the same alloy and in the same temperature range. These tests were carried out on annealed samples of 1 mm thickness. The experimental characterization (both mechanical and microstructural) demonstrated that asymmetric rolling and accumulative roll bonding can readily promote the achievement of ultrafine grained structures in Al-Mg-Si alloys.

Keywords

Aluminum alloys, Severe plastic deformation, ultrafine grained materials.

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