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Influence of Zn and Sn on the Precipitation Behavior of New Al–Mg–Si Alloys

1
Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Materials Science & Engineering, Institute I: General Materials Properties, 91058 Erlangen, Germany
2
ETH Zurich, Department of Materials, Laboratory of Metal Physics and Technology, 8093 Zurich, Switzerland
3
Chair of Nonferrous Metallurgy, Montanuniversitaet Leoben, 8700 Leoben, Austria
4
Christian Doppler Laboratory for Advanced Aluminum Alloys, Chair of Nonferrous Metallurgy, Montanuniversitaet Leoben, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Materials 2019, 12(16), 2547; https://doi.org/10.3390/ma12162547
Received: 9 July 2019 / Revised: 8 August 2019 / Accepted: 9 August 2019 / Published: 10 August 2019
(This article belongs to the Special Issue Alloy and Process Development of Light Metals)
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Abstract

In this study, we demonstrate how Zn and Sn influence hardening behavior and cluster formation during pre-aging and paint bake treatment in Al–Mg–Si alloys via hardness tests, tensile tests, and atom probe tomography. Compared to the standard alloy, the Sn-modified variant shows reduced cluster size and yield strength in the pre-aged condition. During the paint bake cycle, the clusters start to grow very fast and the alloy exhibits the highest strength increment. This behavior is attributed to the high vacancy binding energy of Sn. Adding Zn increases the formation kinetics and the size of Mg–Si co-clusters, generating higher yield strength values for both the pre-aged and paint baked conditions. Simultaneous addition of Zn and Sn creates a synergistic effect and produces an alloy that exhibits moderate strength (and good formability) in the pre-aged condition and accelerated hardening behavior during the paint bake cycle. View Full-Text
Keywords: Al–Mg–Si alloy; Zn; Sn; paint bake; Al–Mg–Si–Zn–Sn alloys; cluster formation; hardening behavior Al–Mg–Si alloy; Zn; Sn; paint bake; Al–Mg–Si–Zn–Sn alloys; cluster formation; hardening behavior
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Glöckel, F.; Uggowitzer, P.J.; Felfer, P.; Pogatscher, S.; Höppel, H.W. Influence of Zn and Sn on the Precipitation Behavior of New Al–Mg–Si Alloys. Materials 2019, 12, 2547.

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