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

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)
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Abstract

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.
Original languageEnglish
Article number108837
Pages (from-to)108837
Number of pages1
JournalMaterials and Design
Volume193
DOIs
Publication statusPublished - Aug 2020

Bibliographical note

Publisher Copyright:
© 2020

Keywords

  • Aluminium
  • Automotive
  • Deep-drawing
  • Paint-bake
  • Retrogression
  • Transmission electron microscopy

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