Warm-forming of pre-aged Al-Zn-Mg-Cu alloy sheet

Johannes A Österreicher, Matheus A Tunes, Florian Grabner, Aurel Arnoldt, Thomas Kremmer, Stefan Pogatscher, Carina M Schlögl

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

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Aluminium alloys of the 7xxx series are attracting the attention of automakers due to their high specific strength. However, widespread use of 7xxx series alloys for the production of car parts from sheet metal has so far been prevented due to their low formability at room temperature and the fact that conventional automotive paint-bake cycles are not suitable for aging the material to peak strength. Here we present an economic process chain for the deep-drawing of automotive parts from pre-aged AA7075 sheet at 180–250 °C that combines good formability with improved paint-bake response. The produced parts achieve roughly 95% of the peak-aged strength of AA7075. Precipitation during the production process is studied by differential scanning calorimetry and transmission electron microscopy.
Seiten (von - bis)108837
FachzeitschriftMaterials and Design
PublikationsstatusVeröffentlicht - Aug. 2020

Bibliographische Notiz

Funding Information:
This work received support from the Austrian Research Promotion Agency (FFG) in the projects 3DnanoAnalytics (FFG-no. 858040 ) and AMALFI (FFG-no. 872641 ) as well as by the Austrian Institute of Technology (independent research 2019). MAT and SP are grateful to the European Research Council (ERC) excellent science grant TRANSDESIGN through the Horizon 2020 program (contract no. 757961 ). The authors would like to thank Professor Peter J. Uggowitzer (ETH Zurich and MU Leoben) for fruitful discussion and the technical staff of LKR Ranshofen and MU Leoben for their invaluable assistance.

Publisher Copyright:
© 2020

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