Deformation behaviour in superplastic 5083 Al alloy during biaxial gas pressure forming with lubrication

H. H. Chen, H. Y. Wu, W. S. Lee, S. Lee

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Effect of lubrication on deformation behaviour of a superplastic material has been given little attention, although it is important for industrial application. In this paper, a superplastic 5083 Al alloy under biaxial deformation was investigated by deforming the sheet into a cylindrical die cavity with and without lubrication. Several interrupted tests were performed to bulge the sheets to various depths for two different strain rates, the formed parts were then utilised to evaluate the effect of lubrication on metal flow, thickness distribution and cavitation. It was found that reducing the interfacial friction by use of a lubricant improved the metal flow after the deformed sheet had made contact with the bottom surface of die. Changes of the metal flow during forming not only developed a better thickness distribution of the formed part, but also reduced cavitation levels.

Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalMaterials Science and Technology
Volume24
Issue number1
DOIs
StatePublished - Jan 2008

Keywords

  • Cavitation
  • Lubrication
  • Superplastic 5083 Al alloy
  • Superplastic forming

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