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Age-Hardening Response of AlMgZn Alloys with Cu and Ag Additions

26 Pages Posted: 3 Apr 2020 Publication Status: Accepted

See all articles by Lukas Stemper

Lukas Stemper

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Matheus A. Tunes

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Paul Oberhauser

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Peter J. Uggowitzer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Stefan Pogatscher

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Abstract

A recurrent challenge with aluminum alloys is their long-standing trade-off between mechanical strength and formability. Recently recyclability has put further pressure on the development of single-alloy concepts for solving this challenge. This study addresses an AlMg-based system featuring additional elements to facilitate age-hardening but retaining a high Mg content for inherent pronounced strain hardening as a potential candidate. Age-hardening was enabled by T-phase based precipitation in the commercial alloy EN AW-5182 via the addition of 3.5 wt.% of Zn. The investigation shows that minor additions of Cu and Ag enhance and accelerate it. The study also compares single-step and double-step artificial aging. Hardness and tensile testing and scanning transmission electron microscopy methods were deployed to characterize the alloys investigated, mechanically and microstructurally. An alloy with added Zn, Cu and Ag showed improved strain hardening and reduced serrated flow in the soft state, while exhibiting an age-hardening response of up to 326 MPa in yield strength leading to an ultimate tensile strength of 550 MPa in peak-aged condition. The study discusses the evolution of the microstructure during artificial aging in the light of Zn, Cu and Ag additions and their effect on the precipitation process.

Keywords: Aluminum alloys, AlMg alloys, Alloy design, Hardening behavior, Precipitation

Suggested Citation

Stemper, Lukas and Tunes, Matheus A. and Oberhauser, Paul and Uggowitzer, Peter J. and Pogatscher, Stefan, Age-Hardening Response of AlMgZn Alloys with Cu and Ag Additions. Available at SSRN: https://ssrn.com/abstract=3559983 or http://dx.doi.org/10.2139/ssrn.3559983

Lukas Stemper (Contact Author)

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

Leoben, 8700
Austria

Matheus A. Tunes

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Leoben
Austria

Paul Oberhauser

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Leoben
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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