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Mechanisms Determining Bendability in Al-Mg-Si-Fe Crossover Alloys

23 Pages Posted: 1 Aug 2024 Publication Status: Under Review

See all articles by Bernhard Trink

Bernhard Trink

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Irmgard Weißensteiner

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Peter J. Uggowitzer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Sebastian Samberger

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Diego Coradini

AMAG rolling GmbH

Georg Falkinger

AMAG rolling GmbH

Katharina Strobel

AMAG rolling GmbH

Stefan Pogatscher

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Abstract

Al-Mg-Si-Fe crossover alloys combine the microstructure-controlling effect of iron-rich intermetallic primary phases with the age-hardening properties of Al-Mg-Si alloys. This study investigates the mechanisms which determine bendability in these alloys. The commercial alloy 6016 was heavily doped with Fe and Si to conceptionally mimic some of the effects of increased end-of-life scrap input. Various processing routes, from casting to cold-rolled sheet metal, were also considered. The study concluded that the bendability of Al-Mg-Si-Fe crossover alloys does not correlate strictly with the addition of Fe, but is effected mainly by the composition of the aluminum matrix and the processing conditions. The investigation provides detailed insights into the effects of the type and density of intermetallic particles, the overall strength of the alloy, its strain hardening and the development of porosity due to particle cracking and the dissolution of phases leading to Kirkendall pores. It links the fracture of iron-rich primary phases and void formation which degrade bending performance itself to aluminum matrix strength and strain hardening. It also reveals that Kirkendall pores have a strong negative effect on bending because (similarly to fractured primary phase particles) these pores promote the formation of narrow shear bands which cause early bending failure. Finally, the study demonstrates that pore formation itself is triggered by slow cooling steps during manufacturing, but that the pores can be healed by adjusting the solution treatment time as the Ostwald ripening of the pores can restore bending capacity in all the alloys and conditions investigated.

Keywords: aluminum alloy, bending, iron-rich intermetallic phases, porosity, microstructure

Suggested Citation

Trink, Bernhard and Weißensteiner, Irmgard and Uggowitzer, Peter J. and Samberger, Sebastian and Coradini, Diego and Falkinger, Georg and Strobel, Katharina and Pogatscher, Stefan, Mechanisms Determining Bendability in Al-Mg-Si-Fe Crossover Alloys. Available at SSRN: https://ssrn.com/abstract=4912386

Bernhard Trink (Contact Author)

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys ( email )

Leoben, 8700
Austria

Irmgard Weißensteiner

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Leoben, 8700
Austria

Peter J. Uggowitzer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Leoben
Austria

Sebastian Samberger

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys ( email )

Leoben, 8700
Austria

Diego Coradini

AMAG rolling GmbH ( email )

Georg Falkinger

AMAG rolling GmbH ( email )

Katharina Strobel

AMAG rolling GmbH ( email )

Stefan Pogatscher

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys ( email )

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