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Strain-Induced Clustering in Al Alloys

15 Pages Posted: 31 Jul 2023 Publication Status: Published

See all articles by Philip Aster

Philip Aster

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Phillip Dumitraschkewitz

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Peter J. Uggowitzer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Florian Schmid

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Georg Falkinger

AMAG rolling GmbH

Katharina Strobel

AMAG rolling GmbH

Peter Kutlesa

University of Vienna - Erich Schmid Institute of Materials Science

Michael Tkadletz

Montanuniversität Leoben - Department of Materials Science

Stefan Pogatscher

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Abstract

Solute clusters represent the start of decomposition during aging of aluminum alloys and can generate strengthening while keeping the strain hardening high in comparison with precipitates. In this study, clusters in a pre-aged AlMgSiCu 6xxx-series and a recently developed AlMgZnCu crossover alloy were investigated by atom probe tomography (APT) tensile testing before and after straining. Pre-aging was performed at 100 °C and 60 °C respectively, and a tensile strain of 5 % was applied. The key feature detected was the formation of clusters during plastic deformation, referred to here as “strain-induced clustering”. It is explained based on diffusion enhancement by the strain-induced formation of excess vacancies during tensile testing, and evaluated by means of a simple modeling approach. In addition to the significant intrinsic contribution of clusters to strain hardening via dislocations, strain-induced clustering adds a hypothetical non-dislocation-based component to strain hardening.

Keywords: Aluminum Alloys, Cluster hardening, Mechanical Testing, Excess vacancies, Strain-induced clustering

Suggested Citation

Aster, Philip and Dumitraschkewitz, Phillip and Uggowitzer, Peter J. and Schmid, Florian and Falkinger, Georg and Strobel, Katharina and Kutlesa, Peter and Tkadletz, Michael and Pogatscher, Stefan, Strain-Induced Clustering in Al Alloys. Available at SSRN: https://ssrn.com/abstract=4526728 or http://dx.doi.org/10.2139/ssrn.4526728

Philip Aster (Contact Author)

Montanuniversität Leoben - Chair of Nonferrous Metallurgy ( email )

Phillip Dumitraschkewitz

Montanuniversität Leoben - Chair of Nonferrous Metallurgy ( email )

Peter J. Uggowitzer

Montanuniversität Leoben - Chair of Nonferrous Metallurgy

Leoben
Austria

Florian Schmid

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

Leoben, 8700
Austria

Georg Falkinger

AMAG rolling GmbH ( email )

Katharina Strobel

AMAG rolling GmbH ( email )

Peter Kutlesa

University of Vienna - Erich Schmid Institute of Materials Science ( email )

Jahnstraße 12
Leoben
Austria

Michael Tkadletz

Montanuniversität Leoben - Department of Materials Science ( email )

Stefan Pogatscher

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

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