Study on the Influence of Nickel Additions on AA7020 Formability Under Superplastic Forming Like Conditions

S. Taylor, V. Janik, R. Grimes, R. Dashwood

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
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This study set out to look at the influence of nickel additions on a commercially available AA7020 to understand the impact of the resultant intermetallics on recrystallization, formability and material strength. Elevated temperature tensile testing across a range of strain rates (5 × 10−4s−1 × 10−1 s−1) and three temperatures (450− 500 °C) to compare material ductility followed by gas bulge testing at 475 °C and two gas pressures to investigate formability in a test closer to industrial forming conditions. Material strength was established using standard tensile testing, and EBSD used to understand the microstructural evolution of the materials. It was seen that the nickel additions increased ductility of the material across all test conditions, coupled with increasing the material strength. This was achieved due to the formation of nickel rich intermetallics which refine the microstructure during pre-heating through particle stimulated nucleation and subsequently improve strength through precipitation hardening in aging treatments. Graphic Abstract: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)2597-2604
Number of pages8
JournalMetals and Materials International
Issue number9
Early online date11 Feb 2023
Publication statusPublished - Sept 2023

Bibliographical note

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The authors would like to acknowledge EPSRC for funding of this project, and Superform for both funding and research support during the project. The authors would also like to thank Norsk Hydro for material supply and in particular Simon Miller Jupp for instigating the investigation of nickel additions. In addition to that, the characterisation facility is supported from the Higher Education Funding Council for England (HEFCE) fund and the WMG Centre High Value Manufacturing Catapult is gratefully acknowledged.


  • Aluminium
  • Aluminium alloys
  • EBSD
  • Quick plastic forming
  • Superplastic forming

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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