Synergistic Alloy Design Concept for New High-Strength Al-Mg-Si Thick Plate Alloys

43 Pages Posted: 9 Nov 2020

See all articles by Florian Schmid

Florian Schmid

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Irmgard Weißensteiner

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Matheus Araujo Tunes

Government of the United States of America - Materials Science and Technology Division

Thomas Kremmer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Thomas Ebner

AMAG rolling GmbH

Roland Morak

AMAG rolling GmbH

Peter J. Uggowitzer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Stefan Pogatscher

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Abstract

With the aim of fully exploiting the advantageous strength-to-weight ratio evident in Al-Mg-Si alloys, this study presents measures for increasing the yield strength of an EN AW-6082 type plate alloy. In addition to describing the thermodynamic simulation-based adjustment of age-hardenable elements (Si, Mg and Cu) and a modified artificial ageing treatment, it investigates the effects of adding a small amount of Zr. The significant strengthening induced by adding Zr is correlated with sub-grain boundary hardening in a recovered microstructure after solution annealing at 570°C, compared with the almost entirely recrystallized microstructure in an unmodified EN AW-6082 alloy. In combination with a maximum dissolvable number of age-hardenable elements and interrupted quenching, which comprises an improved heat treatment strategy for thick plates, it is seen that the yield strength can be increased by more than 40% to 411 MPa compared to conventional EN AW-6082 base material as verified by tensile testing. In the study scanning electron microscopy and scanning transmission electron microscopy were performed for microstructural characterization with a focus on particle and deformation analysis. All individual contributions which generated the superior strength are calculated and discussed in order to reveal the microstructure-property relationship.

Keywords: Aluminum alloys, Precipitation strengthening, alloy design, wrought alloys

Suggested Citation

Schmid, Florian and Weißensteiner, Irmgard and Tunes, Matheus Araujo and Kremmer, Thomas and Ebner, Thomas and Morak, Roland and Uggowitzer, Peter J. and Pogatscher, Stefan, Synergistic Alloy Design Concept for New High-Strength Al-Mg-Si Thick Plate Alloys. Available at SSRN: https://ssrn.com/abstract=3726303 or http://dx.doi.org/10.2139/ssrn.3726303

Florian Schmid (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

Matheus Araujo Tunes

Government of the United States of America - Materials Science and Technology Division ( email )

Los Alamos, NM 87545
United States

Thomas Kremmer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy ( email )

Leoben
Austria

Thomas Ebner

AMAG rolling GmbH

Postfach 32
Ranshofen, 5282
Austria

Roland Morak

AMAG rolling GmbH

Postfach 32
Ranshofen, 5282
Austria

Peter J. Uggowitzer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Leoben
Austria

Stefan Pogatscher

Montanuniversität Leoben - Chair of Nonferrous Metallurgy ( email )

Leoben
Austria

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